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RE: OPS 120 20cc available in the USA?
[quote]ORIGINAL: dhal22 ... i will open a thread on my engine when i receive it. [/quote] Better add your questions to [b]The OPS engine thread[/b]: http://www.rcgroups.com/forums/showthread.php?t=970617 It is more comfortable for the speed folks to find OPS specific info concentrated in a single thread...
Posted on: 9/10/2009 9:07 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9085391
RE: OPS 120 20cc available in the USA?
[quote]ORIGINAL: Yak13 Im not a real expert in fast planes, but what is the difference/advantage of the OPS 67 vs a Rossi 90 DF for example? I just got the latter and it is impressive (not run yet). [/quote] For prop applications the advantage of the OPS .67 RIRE ducted fan or speed engine vs the ROSSI R90 DF engine is not easy to determine. Both engines reach the power/torque peak when running in excess of 20 K. So in both cases the prop diameter should not be larger than 9�. But a 15 cc DF engine generates more torque than a 11 cc DF or speed engine and thus is able to pull slightly more prop pitch at the same prop diameter. So which of these two engines to be used for better top speed? Well this entirely depends on the [b]airframe drag[/b]. In case we have a super sleek speed airframe design ready to fly loaded with many drag reducing finesses, then Ipersonally would tend using the OPS .67: [ul] [*] In general smaller speed engines are capable of turning more rpm (the actual 5+2 ports OPS .67 is able to spin up to 24 K stock and 27K if highly modified) than bigger IC speed engines [*] Now we can apply prop pitches exceeding 11� effectively, especially during unloading in a dive from high altitude [*] The belly diameter of a 11cc tuned pipe is smaller versus a 15 cc pipe => a narrower fuselage can be applied [*] A smaller engine does consume less fuel per time unit => increased flight time when using the same bubble tank volume (usually speed engines don't feature a throttle carb) [*] weight reduction due to the smaller engine => lower wing load [/ul] However if the speed plane design is not the most sophisticated [;)] (e.g. the [b][link=http://www.rcgroups.com/forums/showthread.php?p=12734995#post12734995]Speed Cobra[/link][/b] ), then 13 to 20 cc ducted fan engines are mandatory. These “big-block� engines provide enough peak torque needed to overcome increased airframe drag by using reduced prop pitches (e.g. 9�x10� CF props).
Posted on: 9/10/2009 1:02 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9084347
RE: New fast airframe in the works
[quote]ORIGINAL: Yak13 Can you suggest a method for making this pipe? I have a very competent team that can do it if we give them a head start. [/quote] A simple and inexpensive way to make a tuned pipe is a combination of [ul] [*] trimming bar stock aluminium on a lathe (lead-in pipe part + stinger) creating a wall thickness of 1 mm and of [*] applying 1 mm thick aluminium sheet material for the two cones as well as for the center belly part. [/ul] The type of aluminium recommended is 6061-T6 for instance. By using the following trigonometric correlations you can draw the required templates for cutting the 1 mm thick aluminium sheet for the cones. Please leave addidtional 5 mm sheet on each long side ("m") and bend it to 90 degrees – this excess material will be spent for MIG or WIG welding each cone together. [center][image]{akamaiimageforum}/upfiles/292022/He97050.jpg[/image][/center] Before joining all sections by welding [lead-in pipe - diffusor cone - high point (belly) - reflector cone - stinger pipe] it is wise to create a solid base (welded) for the pressure fitting. P.S Please don't shorten the length of the stinger of the custom made “fat� pipe. The given geometry is essential for maximum engine output.
Posted on: 9/10/2009 12:35 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9084303
RE: New fast airframe in the works
[quote]ORIGINAL: Yak13 I have a Macs 1290 right here, but it is too long, so it would have to be cut to be able to have 30 cm length including the header (to the belly of the pipe). I think this is the best shot for initial flights, while I get the 1190. [/quote] As far as know MACS #1290 muffled tuned pipe features the identical twin-cone geometry like the #1190. So just cut-off the entire muffler section of your #1290 to obtain a MACS #1190 tuned pipe. Meantime I've calculated a “fat + high volume� version of a non-muffled high performance full length tuned pipe. [center][image]http://image2-4.rcuniverse.com/e1/forum/upfiles/292022/Vt56154.jpg[/image][/center] The geometry of this fat pipe is mainly based on the 5+2 ports ROSSI .90 sleeve timings (see below), port areas etc but it will work nicely with any 15 to 20 cc speed engine. [center][image]http://image2-8.rcuniverse.com/e1/forum/upfiles/292022/Vq52638.jpg[/image][/center] The internal volume of this fat pipe has been increased by about 15% versus MACS #1190. Therefore we can reduce the pipe length distinctly without the risk of engine overheating - meaning in case of a 15 cc DF engine approx. 25 cm tuned pipe length between glow plug and center of the belly section. This custom fat pipe will serve as an effective alternative not only to MACS #1190 but also to OPS #5270 (see below) for example – just in case a shorter pipe length is required. [center][image]http://image2-3.rcuniverse.com/e1/forum/upfiles/292022/Ns44183.jpg[/image][/center] BTW, the best pressure fitting location to achieve high and even tank pressure is at the beginning of the high point belly part. [center][image]http://www.macspro.com/old/tp3.jpg[/image][/center]
Posted on: 9/9/2009 3:49 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9081957
RE: New fast airframe in the works
[quote]ORIGINAL: Yak13 If I use the Macs 1190 pipe I will not be able to achieve the 29-30 cm. The pipe is too long. Maybe a 1160? I have one of the guys mounting the Rossi today, Ill try to take some pics. [/quote] Do you mean that there's not enough space available for installing the #1190 tuned pipe in the fuse, especially the back reflector cone and the stinger part? The MACS pipe #1160 sadly features not enough internal pipe volume for a .90 DF engine even if set much longer than 29 cm (by adding mucho header length). The #1160 would already lead to engine overheating on a .13 cc speed engine. [sm=frown.gif] Normally when drawing a purpose speed plane folks take the engine plus header plus pipe (adjusted at the correct pipe length) and design the plane “skin-tight� around these most important components. However due to lack of space in many cases custom solutions are necessary, e.g. for the tank compartment, the aluminium engine mount, the header/pipe heat shield etc
Posted on: 9/9/2009 12:17 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9081572
RE: New fast airframe in the works
[quote]ORIGINAL: Yak13 Now lets not forget that the REAL intention is to make the larger, G62 powered airframe very fast. I will start with a Zinger 16x16 prop, reducing diameter and increasing pitch until we get a static 9,500 RPM. What is your opinion on that setup? The airframe is exactly the same as the other one (larger, of course). [/quote] Well assuming [ul] [*] your highly modified ZG62 will reach 11K rpm unloaded “on pipe� during diving and [*] you're going to install a narrow swan-neck shaped exhaust header http://www.merker-modellbau.de/kruemmer.htm like MERKER #02455 and [*] a fully cowled MACS #1197 tuned pipe [/ul] then a prop size of about 14x18� (two-bladed) would be worth a try. Find a propeller that doesn't need much shortening of the diameter because in most cases prop efficiency is badly harmed due to shortening (the choice of prop outer section airfoil(s) and their pitch distribution are most important for any speed prop). Maybe contact www.supercoolprops.com for a custom speed prop design... P.S. For the ZG62 tuners: http://www.rcuniverse.com/forum/fb.asp?m=8992127 P.P.S Mr. Fuchs also is a highly recommended maker of giant scale racing props http://www.cfk-fuchs.de/html/propeller.html . You may ask him for a suitable "oversquared" speed prop fitting the rpm/torque regime of a highly modified ZG62.
Posted on: 9/8/2009 11:27 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9080503
RE: New fast airframe in the works
[quote]ORIGINAL: Yak13 Hi fellas The two first fuselages are here!! These are of the small model. I also got a good deal on a new Rossi 90 DF, which will power prototype #1. #2 will be pulled by a Weston 50V. Just finished cutting the wings. It turns out the design is ''engine-oriented'', so the specs were modified a bit for the Rossi: 550 sq in 60 in wingspan 8.5% wing profile Looks really nice!! Any suggestions on the Rossi will be appreciated, as I have only owned one Rossi 46, no pipe. The 90 looks awesome. It should deliver. [/quote] Well a ROSSI .90 DF engine is a very different animal compared to the West 50V1 being just a higher-timed WEBRA .50 FISE. Talking 5 HP versus 2.5 HP output... [sm=omg_smile.gif] Because the speed prop size is essential especially in combination with a ducted fan engine, here are suggestions for a low drag 10 cc to 20 cc speed airframe mainly based on the long speed history of glow powered German speed planes often being considerably faster than 200 mph: [ul] [*] widest part of the fuselage should be 60 to 70 mm in case of 10 to 20 cc FIRE or RIRE speed or DF engines [*] nice smooth fillets at the intersections of fuse and wing and fuse and tail feathers [*] no swept-back wing geometry, instead trapezoid shaped wing [*] wing root length of about 28 cm [*] upright engine mounting position [*] fully enclosed engine and tuned pipe [*] no landing gear [*] bladder tank volume of about 300 cc [*] R/C in-flight mixture control (e.g. Perry VP-IMC-05 http://www.perrypumps.com/prod03.htm ) [*] in case of a venturi speed carb usage of a fuel shut-off device [*] fully hidden linkages [*] MACS tuned pipe #1190 for engines from 13 to 20 cc [*] depending on the prop size used for the ROSSI .90 DF: tuned pipe length of about 29 cm between glow plug and middle of the pipe belly [*] MCCoy MC-9 plug [*] fuel: nitro content max 5% for the 15 cc ROSSI DF engine; generally recommended oil content of 22 to 25 % [/ul] More in detail to read [b]here[/b]: http://www.rcuniverse.com/forum/fb.asp?m=8751461 These requirements will enable the application of a prop diameter small enough allowing a 10 cc to 20 cc high-timed speed engine to run at its intended rpm/torque peak, meaning above 20.000 rpm. So you should look at a maximum prop diameter of 9� in case of the ROSSI .90 ducted fan engine to avoid transonic prop tip speeds. A prop pitch of at least 10� is desirable (the amount of prop pitch efficiently usable is directly connected to the aerodynamic quality of your airframe – the cleaner the more prop pitch [8D] ). [b]RocketRob[/b] for instance makes strong 9x10 carbon fiber props. For safety reasons the continuous strand carbon fiber propeller technology (tempered) is mandatory in combination with these 10 to 20 cc high-timed engines made by OPS, OS, PICCO, ROSSI, NOVAROSSI, BVM/Nelson, K&B, ANGSTREM etc. As for breaking-in ABC high performance engines, you must run them WOT right from the very first fire-up! [u]Reason:[/u] They have to reach operating temperature a soon as possible. If the piston is very tight at TDC (which is good because that stands for long lasting good piston/sleeve fit) just take a heat gun and warm up the cylinder head appropriately before the first start. These engines have to run on the rich side ever meaning a big white smoke trail at full throttle is a must, see pics below. The in-flight R/C-mixture control is very useful to maintain that “smoke� setting during flight...
Posted on: 9/8/2009 4:27 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9079287
RE: Shrike .10-OS .25 vrdf project
[quote]ORIGINAL: smoknrv4 BTW the theoat Dia. is .281'' [/quote] Well when attempting to increase the carb bore diameter we always need to know the crankshaft bore at its narrowest part. Because we want to maximise the venturi effect of the carb (acceleration of the sucked-in air) the carb bore has to be slightly smaller than the crank bore. So please disassemble your entire engine (you also could measure the exhaust timing before that using a [b][link=http://www.rcgroups.com/forums/showthread.php?p=12658256#post12658256]degree wheel[/link][/b]) and then measure the crankshaft bore. After that you can determine the correct speed venturi carb bore diameter. For example if the crank bore of the OS .25 VR-DF is 8 mm, then you should take 7.5 mm venturi bore dia... I suggest that you send the OS .25 VR-DF engine to CP. He will increase the exhaust timing of the brass liner to 180 degrees and will make a well working speed venturi carb for you. Below a certain degree shimming a liner mildly works. But you will be required to adopt the compression ratio from a certain degree, see [b][link=http://www.rcgroups.com/forums/showthread.php?p=12590124#post12590124]here[/link][/b] for example. After increasing the exhaust duration to 180 degrees a pipe length of about 23.5 cm between plug and middle of the tuned pipe's belly (e.g. MACS 1120) will work OK for the OS .25 VRDF. This setup will allow rpm of at least 26K in flight. As for lighten the piston and the conrod, the OS .25 VR-DF is not worth that IMHO. Better suited for a complete internal mod job would be the [b]JETT .35 BSE FIRE[/b] or the [b]OPS .29 VAE[/b] # 83600 (see pics below) which represent engines that – even after heavily modded - will last long running at WOT only.
Posted on: 9/5/2009 10:58 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9071509
RE: OPS 120 20cc available in the USA?
Attention please – this only happens once in a decade! There are several NIB gold head 5-ports [b]OPS .60 Super SPP VAE[/b] speed engines offered on the large bay auction site. This is THE engine to break FAI speed records! In addition equally powerful OPS .67 VAE engines are offered sharing many parts with the .60 VAE. I am not affiliated with the seller BTW... [center][image]http://image2-1.rcuniverse.com/e1/forum/upfiles/292022/Xr45611.jpg[/image][/center]
Posted on: 9/5/2009 8:38 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9071306
RE: Why are there so few rear exhaust engines?
[quote]ORIGINAL: Bigshark [quote]ORIGINAL: dhal22 OPS is now selling a .90 and a 1.20 rear exhaust engines. with both turning over 24,000 rpms they aren't for beginners. here is a photo of the marine version (shipped incorrectly) i received recently. the air version looks even better. i'll try to find a photo. [/quote] That picture looks like something that belongs in a nuclear reactor. Nice. Who the heck is OPS? [/quote] Here you'll find a lot of info: [center][size=3][b][link=http://www.rcgroups.com/forums/showthread.php?t=970617]The OPS engine thread[/link][/b][/size][/center] We're talking about true ABC constructions, high-timed to set FAI speed records for example... [center][image]http://image2-1.rcuniverse.com/e1/forum/upfiles/292022/Xr45611.jpg[/image][/center] Another source for high-performance rear exhaust ABC engines is Novarossi: [center][size=3][b][link=http://www.rcgroups.com/forums/showthread.php?t=1073318]The NOVAROSSI / REX aero engines thread[/link] [center][/b][/size][/center] [image]http://image2-9.rcuniverse.com/e1/forum/upfiles/292022/Qo38719.jpg[/image][/center]
Posted on: 9/3/2009 12:00 PM by Author "I-Love-Jets"
in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=9066903
RE: Shrike .10-OS .25 vrdf project
[quote]ORIGINAL: smoknrv4 Did some more flights today, tried a 7-6 APC clipped down to 6.5x6, I couldn't believe the difference, it went from 21000 the other day, to almost 24000 today, on the ground, a couple thousand RPM gained, much better performance out of her today in the air too, much faster, maybe I'll try a 6.25x6 and see what its like.[:D] [/quote] [quote]ORIGINAL: MJD You're getting into the magic rpm range of that setup now, cool. I wonder if you can pull any more pitch. Both Graupner and APC have 6.5 x 6.5 props, mebbe clipped a bit. I wanna see it. I have some CNC'ed maple 7-9 speed props, maybe I can make you a 5.25-9 prop. Not that it would work.. [/quote] Getting the engine into its correct power band by using a smaller prop load is one thing, transferring the additional rpm into speed another [;)] A 5.25x9 prop sadly will not be working with a draggy airframe like the Shrike .10. This would even be too much pitch for an airfame like the 95 cm span Me-163 by Topp-Rippin. Such highly oversquared props will only work efficiently after diving with a purpose built design like the one below shown (we're talking about at least 170 mph with a 2.5 cc FIRE Novarossi engine and prop diameter smaller than 5.5" ). [center][image]http://image2-9.rcuniverse.com/e1/forum/upfiles/292022/Dy78209.jpg[/image][/center] Generally a [b]5.25x9" speed prop[/b] would already provide too much load for the OS .25 VR-DF. In combination with a purpose built low drag airframe a 5.25x9" prop could be working promisingly with the [b]JETT BSE .35 FIRE[/b] 5.5 cc or the [b]OPS .29 speed SPP VAE[/b] RIRE 5 cc (# 8360) for instance. For that the best prop size for the combo [center]Shrike .10 + OS .25 VR-DF + MACS Wizard mini pipe [/center] would be something around 6.5x6.5". The first choice IMHO is the [b]Graupner Speed Prop 6.5x6.5" (#1305.16.16)[/b] - non-shortened. The Shrike .10 sadly demands 6.5" or larger prop diameters due to its aerodynamic layout...
Posted on: 9/1/2009 6:12 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9061116
RE: Rossi engine info?
The ROSSI performance figures have been addressed before, see here for instance: [size=3][center][b][link=http://www.rcuniverse.com/forum/m_8895433/tm.htm]rossi engines, take a look[/link][/b][/center][/size] [quote]ORIGINAL: SCALECRAFT Awesome engines. Pretty and powerful. 61 rear exhaust. Go to Planethobby.com for the NovaRossi aircraft engines and stuff. [/quote] Well, NOVAROSSI is an independent company and thus has nothing to do with ROSSI engines. Please have a look at [size=3][center][b][link=http://www.rcgroups.com/forums/showthread.php?t=1073318]The NOVAROSSI / REX aero engines thread[/link][/b][/center][/size] and [size=3][center][b][link=http://www.rcgroups.com/forums/showthread.php?t=1085012]150 to 200 mph+ speed planes => Where to buy them? - An overview[/link][/b][/center][/size] There you'll find info on NOVAROSSI high-speed applications, speed prop recommendations, engine modifications, suitable speed planes etc. [center][image]http://image2-9.rcuniverse.com/e1/forum/upfiles/292022/Qo38719.jpg[/image][/center] [center][image]http://image2-6.rcuniverse.com/e1/forum/upfiles/292022/Ie98216.jpg[/image][/center] [center][image]http://image2-2.rcuniverse.com/e1/forum/upfiles/292022/He97232.jpg[/image][/center] [center][image]http://image2-9.rcuniverse.com/e1/forum/upfiles/292022/Dy78209.jpg[/image][/center] [center][image]http://image2-9.rcuniverse.com/e1/forum/upfiles/292022/Xc79389.jpg[/image][/center] [center][image]http://image2-4.rcuniverse.com/e1/forum/upfiles/292022/Oh13214.jpg[/image][/center]
Posted on: 8/31/2009 4:21 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9059426
RE: Shrike .10-OS .25 vrdf project
[quote]ORIGINAL: Strykaas Thanks ILJ for clearing that up. How to know if the BT Me163 airfoil is well suited for spoeed or not ? Do YOU know it is not well suited or do you suspect it ? And by the way, I own this plan and a SJ50 SE, what can of speed could I achieve with this setup ? Thanks. [/quote] Mostly detailed scale planes come with thicker airfoils leading to more docile flight characteristics and also to slower landing speeds (more scale-like). If you show us a foto of the wing root and wing tip rib airfoil of the BT Me-163 plan we will be able to evaluate the speed capabilities (type of S-curved reflex airfoil and wing thickness). A side exhaust engine isn't the perfect choice if you're looking for all out speed with a Me-163 "Kraftei". But any hot .50 will power the BT Me-163 nicely. Anyway, you may start a building thread here at RCU...
Posted on: 8/29/2009 12:15 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9054275
RE: Shrike .10-OS .25 vrdf project
[quote]ORIGINAL: smoknrv4 I wonder if theres another model out there to get plans for to build one like the ME-163 you mentioned I-Love-Jets, I'm thinking foam and balsa materials for building one.[:D] [/quote] [quote]ORIGINAL: Strykaas You are a builder. Good. See Brian Taylor's plan for a true scale Me-163. [/quote] Not every Me-163 Komet R/C model is suited for “extreme� speed
Posted on: 8/29/2009 8:19 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9053860
RE: Nemesis NXT Sport
Hallo und schön dass Du auch hier postest (hier sind jedoch eher die "kleinen und preiswerten" Zuhause). So what are the main differences to your existing Nemesis kit? Are there different (thinner) airfoils or a reduced frontal area to gain even more top speed than the current [b]240 mph[/b]? http://www.youtube.com/watch?v=n-wsl2B4q9c http://www.air-c-race.de/Deutsch/Modelle/body_modelle.html http://www.air-c-race.de/shop/index.html?rennflugzeuge.htm @Racerbuilder Please also post your Nemesis NXT Sport in the [b][link=http://www.rcuniverse.com/forum/forumid_183/tt.htm]Scale Racing forum[/link][/b].
Posted on: 8/29/2009 7:50 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9053827
RE: Shrike .10-OS .25 vrdf project
[quote]ORIGINAL: smoknrv4 MJD is right about that, it was too routine, not at all what I was hoping for but still fun [/quote] To be honest: A Shrike is – like countless other so called speed planes – another example of how to waste speed engine power potential. The recommended way to go fast should always be taking an airframe design that already comes with very promising speed potential. Another “speed secret“ when dealing with high-timed engines like the OS .25 VR-DF of course is to effectively make use of very small diameter props (plus high prop pitches if possible). This again demands a very low drag airframe. So in case of the OS .25 VR-DF engine the Shrike simply is much too bulky. A very suitable speed airframe for your OS .25 ducted fan engine is the [b]Me-163 Komet[/b] by Topp-Rippin for example. http://www.rcgroups.com/forums/showthread.php?p=12735390#post12735390 http://www.rcuniverse.com/forum/fb.asp?m=8985804 [image]http://image2-5.rcuniverse.com/e1/forum/upfiles/292022/Pk30395.jpg[/image] Set up with the OS .25 VRDF that Komet will see top speeds of about 165 mph applying the Graupner speed prop 6.5x6.5, shortened to 5.5“ diameter. If you find a well designed speed prop sized 5.5x7.5" the top speed will even reach about 175 mph! [sm=tongue_smile.gif] Use the MACS tuned pipe #1120 set at a pipe length of ca. 23.5 cm between glow plug and middle of the pipe belly. The pipe will be completely hidden within the fuselage of the Me-163 if you mount the engine upright. Generally all of the well known countermeasures to gain more speed (increasing compression ratio, smaller prop dia, more prop pitch, shorter pipe length etc) will be much much more effective if you combine them with an aerodynamically refined speed airframe. Other well suited speed planes (low drag) for a .20 to .35 sized high-timed rear exhaust engine are the: [ul] [*] [b]Beretta .21[/b] by RC-Technik [*] [b]Stinger .21[/b] by RC-Technik [*] [b]Stiletto .21[/b] by RC-Technik [*] [b]AJ-2[/b] QM15 by Matney [*] [b]Avia B-35[/b] by Horrido [*] [b]Spitfire MK 6-7[/b] by Dieter Brandau and numerous others... [/ul] So there are enough options to apply the OS .25 VR-DF effectively. Just check out this thread for more info: [b][center]http://www.rcgroups.com/forums/showthread.php?t=1085012[/center][/b] Or alternatively design and build your own (or teamwork) super low drag speed airfame featuring fully cowled engine/pipe; fillets; well suited airfoils for wing, stab and vertical fin; internally hidden linkages; no hinge gaps etc. If your design turns out to be very successful (e.g. true 180 mph top speed with only 2.5 cc of engine capacity), you will most probably find someone making molds of it...
Posted on: 8/27/2009 11:41 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9050939
RE: OPS 120 20cc available in the USA?
With respect to the availability of OPS aero & marine engines in North America, it would be fine to find a company or a business person that will start selling them again (after Shamrock, Tower and others have stopped distributing these high quality OPS products years ago). In Europe for example there's a constant demand due to advancing serious speed competition within the different FAI regulated F3S classes. In fact no other commercially available speed engine to be used in the F3S-C class (6.61 to 10.00 cc, this is the class to break speed records) is as powerful as the 5-ports OPS .60 Super SPP VAE. When looking for OPS 1.20 RIRE suitable commercially available speed planes there's only a small number of choices: [ul] [*] [b]Messerschmitt ME 163 B 1a Komet[/b] by Sunshine-Wega [*] [b]Cobra[/b] by Fliegerland [*] [b]Phenom[/b] by Oakdale Aircraft [*] [b]Mirage 2000[/b] by RC-Tronics-Topp-Rippin OHG [*] [b]F-102 Delta Dagger[/b] by RC-Tronics-Topp-Rippin OHG [*] [b]ME-163 Komet[/b] by RC-Tronics-Topp-Rippin OHG [*] [b]Blizzard[/b] by generic-fly [/ul] The above fast and rugged composite planes represent acquirable speed planes [ul] [*] that will cope with the outstanding 5.5 HP power output of the OPS 20 cc ducted fan engine (#86115) and also [*] whose aerodynamics will allow the required small prop turning at 20K+ to transfer rpm into top speed efficiently. [*] Some of these above listed speed planes are true 200mph+ aspirants with the right engine / carbon fiber prop combo! [/ul] For details please take a look at this thread [center][size=3][b][link=http://www.rcgroups.com/forums/showthread.php?t=1085012]150 to 200 mph+ speed planes => Where to buy them? - An overview[/link][/b][/size][/center] containing a list of quality composite speed planes. P.S. These OPS 15 and 20 cc RIRE ducted fan speed engines basically are bored-out OPS .80 (5+2 ports) siblings weighing almost the same. They come with additional tungsten weights implemented into the counter-weight of the crankshaft. The familiar needle-bearing conrod of the OPS .67 and .80 has been taken over as well as the (optional) drum valve induction unit. In consequence these “super short-stroke� engines won't achieve more top rpm than the OPS 80, but they offer more punch to turn slightly more prop pitch with authority than the 13 cc OPS .80.
Posted on: 8/25/2009 10:59 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9043462
RE: OPS 120 20cc available in the USA?
[quote]ORIGINAL: Yak13 Does anyone know if the OPS 120 is available in the USA? The specs on this thing are impressive: 5.5 hp @ 24,000 rpm!!! [/quote] Well, we all agree that using the 20 cc OPS engine beast is determined by certain boundary conditions: [ul] [*] Like all speed or ducted fan engine it is high-timed (exhaust duration ca 180 degrees). That results in rpm above 20K. But to achieve these desired rpm numbers and the associated 5HP+ output we are forced to use rather [b]small diameter propeller[/b]. In case of the 10 to 20 cc OPS engines only a prop diameter smaller than 10� will allow the prop tip staying below transonic speeds which is fundamental! [*] The load of the mostly distinctly “oversquared� purpose built speed props must be adjusted right – no easy job if you really want to reach your top speed target number! For the OPS .90 to 1.20 RIRE DF engines the following prop sizes will work well with a suitable airframe: [b]7.5 x12.5�, 8x12�, 8.5x11.5�, 9x11�, 10x10�[/b]. [*] So - when dealing with such high performance engines like these 10 to 20 cc OPS “monsters� - for safety reasons it will be necessary to make [b]carbon fiber speed props[/b] that feature a strong hub (at least 24 mm of hub diameter and 14 mm of hub thickness). [*] In order to let these rather small diameter speed props work efficiently during flight a [b]very low drag airframe[/b] is required. Examples of the most refined designs so far are found in Germany, preferably when talking IC glow powered R/C speed up o 20 cc. Top speeds up to true (FAI compliant) [b]240 mph[/b] are the status quo for the regulatory F3S-C class. [/ul] Please visit this thread: [color=#0000CC][size=4][b][center][link=http://www.rcgroups.com/forums/showthread.php?t=984610]German F3S Speedcup – info, pics, videos[/link][/center][/b][/size][/color] So it is clear that purchasing these 10 to 20 cc OPS speed engines only makes sense if all of these prop & airframe design related demands are met. These heavy duty engines must operate above 20.000 rpm to work efficiently. They are designed to service many many flights without the danger of technical failures at WOT (with open speed venturi carb for maximum output if you like) - even occasional lean runs do not harm these “ABC� or “Bimetal� engines if using at least 20% of oil content (of which at least 50% castor is highly recommended). However, if we don't let these OPS engines run in their correct power band, then we should better use them as nice paperweights or collector's items in our glass cabinet. [sm=wink_smile.gif] This is the [color=#0000CC][size=3][b][link=http://www.rcgroups.com/forums/showthread.php?t=970617]The OPS engine thread[/link][/b][/size][/color] coming with additional info for the interested speed freak: [b]http://www.rcgroups.com/forums/showthread.php?t=970617[/b] [center][youtube]http://www.youtube.com/watch?v=5OfHH6_v9ZQ[/youtube][/center]
Posted on: 8/25/2009 10:47 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9043434
RE: MAGNUMR NOT FAST ENOUGH
[quote]ORIGINAL: thundertiger76 Yes it speeds up in a dive but i thought it was good for 200 mph on a flat run. just want more speed. [/quote] [quote]ORIGINAL: Dieselman1220 Ive been looking for a magnum for a few months. Is there any place in US where one can grab one. Ive been keeping an eye on the classifieds and fleabay with no luck.[/quote] There are many alternatives to Magnums, Diamond Dusts etc. commercially available - and some of them deserve the 200 mph designation! Just take a look at these speed planes everyone can purchase, I am sure you'll find the right one that suits your personal need for speed: [size=3][center][b]http://www.rcgroups.com/forums/showthread.php?t=1085012[/b][/center][/size] [image]http://image2-6.rcuniverse.com/e1/forum/upfiles/292022/Lj21566.jpg[/image]
Posted on: 8/18/2009 6:37 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9024980
RE: 150 to 200 mph+ speed planes => Where to buy them? - An overview
[quote]ORIGINAL: dhal22 anyone care to do the conversion themselves? [/quote] As mentioned before the conversion from the OPS marine engines to the aero version is very simple: http://www.rcgroups.com/forums/showthread.php?p=12493959#post12493959 http://www.rcuniverse.com/forum/fb.asp?m=8988507 In case of [b][link=http://www.rcgroups.com/forums/showthread.php?p=12493959#post12493959]this conversion[/link][/b] I intentionally took the [b]OPS .65 speed SPP RCB[/b] (pic below) because this is the only OPS marine engine that comes with an "external" cylinder water cooling ring which is not difficult to remove during the aero-conversion. All other OPS marine engines that can be converted to a ducted fan aero speed engine fortunately [u]don't[/u] feature this "external" cooling ring - which makes the aero-conversion even easier. [sm=shades_smile.gif] So I reckon the entire conversion procedure from "marine" to "aero" for all other RIRE OPS engines sized .40 to .120 takes only 20 minutes for a person that has never done this before...
Posted on: 8/16/2009 6:41 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9019843
RE: Twin engine speed planes
How about the beautiful full composite [b]DeHavilland DH-88 Comet[/b] made by Airworld? [b][center]http://www.rcgroups.com/forums/showthread.php?p=12885363#post12885363[/center][/b]
Posted on: 8/15/2009 4:06 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9018590
RE: Twin engine speed planes
Another nice Twin that has been optimised for fast combat fighting: The full composite [b]Me-110[/b] by Savex (1:12 scale) [center][b]http://www.rcgroups.com/forums/showthread.php?p=12856931#post12856931[/b][/center]
Posted on: 8/11/2009 7:17 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9008610
RE: Twin engine speed planes
[quote]ORIGINAL: Ed Smith If you want true all out speed then stick with a single tuned pipe engine and do the research. [/quote] Yes you're absolutely right. Whenever 200 mph speed claims of Twin- powered speed planes (be it conventional or delta type airframe) show up here it's time for a big smile [;)] For instance, if you look at the German Speed Cup contenders, nobody will ever use a twin-power setup. Even the inline tractor/pusher configuration is not worth a try in case of serious nitro powered speed attempts. However, this thread rather focuses on "sport speed planes" I believe which is always an interesting topic.
Posted on: 8/11/2009 7:10 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9008597
RE: Twin engine speed planes
A very nice twin-powered fast RC1 type pattern plane is made by Topp-Rippin and called [b]COMET TWIN[/b] Please see: [center][b]http://www.rcgroups.com/forums/showthread.php?p=12736538#post12736538[/b][/center]
Posted on: 8/11/2009 3:34 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=9008080
RE: 150 to 200 mph+ speed planes => Where to buy them? - An overview
[quote]ORIGINAL: dhal22 i want the speed cobra. following I-L-J's information i ordered an OPS .90 bi metal speed engine. ...assuming i get that snafu worked out i will need a larger sized speed plane. [/quote] The Cobra by Fliegerland is the ideal beginner speed plane for "big blocks" such like your OPS .90 monster (pics below). Be prepared for [b]190 mph of top speed[/b] combined with super easy flying characteristics! [sm=thumbup.gif] [quote]ORIGINAL: dhal2 unfortunately after 4 months of waiting it arrived yesterday but it was the marine version. [/quote] Please contact noller-modellbau(et)freenet.de. This guy has the needed parts to convert your 15 cc OPS marine to the aero version. In your case the conversion will be similar to the OPS .80, see: http://www.rcgroups.com/forums/showthread.php?p=12494816#post12494816 For the new OPS 15 cc “Bi-Metal“ engine you'll require: [ul] [*] .60/.65/.67/.80 standard propeller driver assembly #6250 [*] .60/.65/.67/.80 speed venturi carb assembly #6290K [*] 15 cc aero cooling cylinder head [*] 15 cc special finned exhaust header machined from billet aluminium (also fits the OPS .80 engines) [*] TruTurn spinner [/ul] and of course [b]carbon fiber speed props[/b] sized 9x10 for the Speed Cobra (please contact [b]RocketRob[/b] for that). If you don't have a German buddy yet who would help you to ship one or more Speed Cobra kits plus other speed plane kits (for your local speed friends for instance to safe shipping costs) to the US or Canada, then I suggest this: Register for free at http://www.rc-network.de/forum/register.php (the German RCU equivalent) Start a thread in English at the “Motorflug“ sub-forum http://www.rc-network.de/forum/forumdisplay.php?f=18 and ask for someone who would help you to ship that 60x60x120 cm box by DHL over the pond. If that German potential helper is a long-time registered RC-Network user with thousands of posts then he is well integrated into the forum community and thus trustworthy. Remember: Germany is a small country. Many forum folks do know each other personally... To make the transfer public to the German forum users you should keep your thread alive until the speed plane kits have arrived at your home in US or Canada. Please use the [b]tracking number[/b] of the insured DHL shipping and visit your local USPS office. So you will be informed about the status quo of the shipping...
Posted on: 8/4/2009 8:03 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8988507
RE: 150 to 200 mph+ speed planes => Where to buy them? - An overview
[quote]ORIGINAL: dhal22 didn't he leave a german location for buying the speed cobra? i know it would take months though to receive it. [/quote] Well, all in the link of post #1 listed speed planes include the address data of the specific kit maker or distributor respectively. [quote]ORIGINAL: ecoliburger Awesome post, thank you! Wish thee speed cobra was available in the USA. [/quote] There's always a way to get what you want! [;)] If you have a buddy in Germany then it'll be easy to ship several Speed Cobras to the US or Canada. The “[b]Deutsche Post (DHL) Company[/b]“ for instance offers insured shipping to [b]Zone 3[/b] states (that includes also USA and Canada) in a box sized up to 60x60x120 cm. Following Pythagoras' theorem you get a C diagonal length of [u]134 cm[/u]. That means you would be able to pack at least [b]4 complete Speed Cobra kits[/b] into one 60x60x120 cm shipping box! [u]calc:[/u] [ul] [*] 840 EUR = price of 4 Cobra kits [*] 9.50 EUR = national shipping insured to your German buddy [*] 44 EUR = international shipping insured to Zone 3 of the 60x60x120 cm box weighing 10 kg max[/ul] 893.50 EUR grand total (four Cobras shipped insured to US or Canada) equalling ca. 320 US$ per kit shipped This kind of shipping usually takes 4 to 6 weeks from Europe to North America. The 128 cm long Cobra is a very large speed plane. So in case of smaller speed planes of about 1 meter of wing span you could pack approxialely [b]10 kits[/b] (of different makers if you like) into one 60x60x120 cm shipping box! For instance the little [b]ME-163 Komet[/b] by TOPP-RIPPIN is one of the hottest small speed planes available worldwide – and it is not expensive. Powered by only the JETT .35 BSE FIRE or the OPS .29 RIRE it is faster ([b]at least 180 mph[/b] with a 6x8 speed prop) than any Weston V50 powered Magnum or JETT .50 powered Diamond Dust. Just give it a try – you won't be disappointed.[sm=cool.gif]
Posted on: 8/3/2009 9:08 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8985804
RE: Pusher props
There are more makers of special mufflers and tuned pipes for pusher applications: MERKER Modellbau (see gold coloured tuned pipe below): http://www.merker-modellbau.de/schalldaempfer.htm http://www.merker-modellbau.de/impeller.htm SIMON Modellbau: http://www.simon-modell.de/ WestonUK (Genesis tuned mufflers or mini pipes): http://www.westonuk.co.uk/index_161.htm http://www.westonuk.co.uk/index_090.htm [image]http://www.westonuk.co.uk/index090023.jpg[/image] JETT Engineering USA (Jett-Stream tuned muffler) http://www.jettengineering.com/accy/jettstream.html All of these pipe makers do offer custom made solutions too. [8D]
Posted on: 7/27/2009 8:15 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8967187
RE: Pusher props
[quote]ORIGINAL: snappa whats the best muffler solution for a pusher? normal muff will not work [/quote] Pusher type Jett-Stream tuned muffler - see here: [center][b]http://www.rcuniverse.com/forum/fb.asp?m=8073673[/b] [image]http://image2-7.rcuniverse.com/e1/forum/upfiles/28570/Ki18977.jpg[/image]
Posted on: 7/27/2009 6:29 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8967068
150 to 200 mph+ speed planes => Where to buy them? - An overview
Hi! I just made a list of commercially available nitro powered composite speed planes that are [b]faster than 150 mph[/b]. Included are many pictures and recommendations for high performance engines, tuned pipes and suitable propellers. [center][b]http://www.rcgroups.com/forums/showthread.php?t=1085012[/b][/center] Maybe you haven't seen some of them yet, maybe you want to add more speed planes to the collection...
Posted on: 7/26/2009 11:42 AM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8964839
RE: rossi engines, take a look
Because we're now focusing on OPS rather than NOVAROSSI or ROSSI, I added your question to the [size=4][b][link=http://www.rcgroups.com/forums/showthread.php?p=12495404]The OPS engine thread[/link][/b][/size] (post #40).
Posted on: 7/14/2009 2:44 PM by Author "I-Love-Jets"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=8932821
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