RE: JetJoe OWNERS thread
[quote]ORIGINAL: sysiek Hi I try this before only opens to half ways and stop, thanks I will try again . [/quote] Just tried it myself two minutes ago, seems to work fine here..!!?? Possible problem with your ISP..? Cheers, Smithy.
Posted on: 4/1/2012 12:52 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=11023874

RE: JetJoe OWNERS thread
[quote]ORIGINAL: sysiek The jetjoe site do not works please help with where to fund some parts for jj 1400 thanks. [/quote] Try this link: http://www.6158.net/com/stks1/home.php Jet-Joe is now run by a new owner, Jason. So far he seems to be pretty easy to contact and talk to via email. Cheers, Smithy.
Posted on: 4/1/2012 12:35 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=11023854

RE: DX9 issues
[quote]ORIGINAL: DominicM ...can I just ask what you mean on idle down and up. There is an idle bottom, middle, and top. Is idle down the bottom position and idle up the top position? [/quote] As George mentioned, in the second screen on the data terminal, with the throttle and throttle trim both at min, it should read 0%, with the throttle trim at max it should read ~15-20%, with trim and throttle at max it should read 100%. If not the TX learn sequence needs to be carried out again. After the learn sequence is carried out correctly and with the throttle trim at max, the green LED on the ECU should be iluminated and "Ready" should show on the screen. Cheers, Smithy.
Posted on: 3/28/2012 12:16 PM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=11018760

RE: 170F first run
[quote]ORIGINAL: FenderBean [;)] now I just need to ramp it up and see what kind of push its got [/quote] If you're at or near sea level where the air is ok, expect to see at least 37-38lbs, they pull nice and hard.....and are extremely quick to spool from idle to max for a larger turbine. I test ran one just last week and I'm just 54' above sea level, cool ambient temps...the 170 pulled 38.6lbs on the first run to max....pretty good I think, I believe you'll be suitably impressed. Cheers, Smithy.
Posted on: 3/8/2012 10:22 AM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10991576

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: airraptor Knobby what about replacement washers i am sure someone out there has some that would work. I have a little sapac viper that i would like to put a turbine in. it has been done with the P-20 but i think the P-20 is a bit much for it. The JJJ looks to be in the right power and weight range. [/quote] Hey Airraptor, Yes, I guess you could use alternate wave washers, not a bad suggestion at all. They are very small though, and to be honest I've not looked for alternate suppliers. Once the JJJ's have been set-up ok they're not too bad. Cheers, Smithy.
Posted on: 2/21/2012 6:10 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10969950

RE: New JetJoe J-Junior 4lbs turbine
The P20 is a much better quality engine, it also is a bit larger and substantially more thrust. Setting the preload on the Junior isn't the issue, it's the preload wave washer itself which fails, they tend to break into two pieces, needless to say the preload is then non-existent and the engine basically beats itself to death. I have some modifications for the Junior which changes the preload system, shortens the compressor and shaft to reudce the amount of overhang at the front bearing, core balance to under 1mg-in .....seems to work ok so far. The Junior uses ~80-85ml/min. Cheers, Smithy.
Posted on: 2/21/2012 3:53 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10969743

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: airraptor Is it the bearings with the JJJ that are the problem? [/quote] No, the bearings are good quality GRW items. The problem lies with the preload system and poor balance from the factory. Cheers, Smithy.
Posted on: 2/21/2012 1:46 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10969519

RE: K170f start issue.
Hi All, I just wish to show my appreciation for Barry, he went out of his way to help get the 170 up and running. He was able to help me with advice and suggestions via PM and the next start was a success. We need more people who are willing to help like Barry within our hobby. Nuff said. Thank you Barry. All the best, Smithy.
Posted on: 2/21/2012 10:58 AM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10969254

RE: K170f start issue.
Hi Barry, Thanks for your reply. I've got a fair amount of unburnt fuel pouring out the exhaust during "pre-heat" and "switch-over" and she won't ramp up, obviously too much fuel during this period. The initial ignition lights off fine, however the temps don't rise quickly enough and increasing the pump at ignition doesn't seem to alter the temps significantly, lowering the rpm @ ignition helps slightly but the temps still fall well short. I might lower everything and come at them slowly until I get a satisfactory start. I'll take your advice and also lower the "min flow" to 30% and give that a try. If possible could you give me the full set of factory parameters for the K170F kero start?, I suspect during my fiddling I may have got a little off track and need to get back to the correct specs. Cheers and thanks for your help, Smithy.
Posted on: 2/12/2012 11:27 AM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10955573

RE: K170f start issue.
Thanks John, You've been a great help. I'll get an "A123" 3s onto it and see how she goes. Although a freshly charged 2s lipo wasn't causing any dramas that I'm aware of..! Cheers, Smithy.
Posted on: 2/9/2012 3:03 PM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10951788

RE: K170f start issue.
Hi Tony and John, Thanks muchly for your answers, I've already done the "wire twist" on all the external wires, the K170F has the rpm and EGT sensor wires exiting from the front cover using one of those plug-in phone cable setups, nice and simple.... and easy to use. What I did was pop the front cover off and re-route the two starter wires as far away from the rpm sensor on the little pcb as possible, seems to have done the trick, no more rpm spikes as yet. Can you guys give me the standard start parameters for a K170F kero start please? I'm using a 2s 5500mah 35c li-po so I have plenty of battery grunt. Thanks in advance, Smithy.
Posted on: 2/9/2012 10:51 AM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10951475

RE: K140 gas start
Another couple of things to check, connect the HDT and make sure the temp is rising during the gas ignition phase....before it switches to the fuel, if the temp isn't rising enough it won't get onto the pump ramp. Also check the rpm during the same period, if it's erratic and varying by a large amount it will cause start dramas also. Cheers, Smithy.
Posted on: 2/8/2012 6:07 PM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10950512

K170f start issue.
Hi Barry, I have a K170F which is playing up during the initial start sequence. I can see the rpm fluctuating up to ~25,000rpm during the normal 4,000rpm ignition phase, of course this causes the ECU to think the engine is turning faster than it actually is and the start fails. I suspect it may be the starter wires under the front cover causing some interference to the rpm sensor....is there anything I can do to help resolve the issue?? Cheers, Smithy.
Posted on: 2/8/2012 12:42 PM by Author "knobby1" in the forum "KingTech Turbines International"
http://www.rcuniverse.com/forum/fb.asp?m=10950036

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: chuckels I heard he is the best.....[:D] although I think I put his knickers in a knot....[:@] [/quote] Oi...!!!! I resemble that remark... ;-)) ......and I don't wear ladies knickers.....at least not during the day.. ;-)) BS.
Posted on: 11/27/2011 5:11 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10831904

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: jymster Ok, thanks for the offer Brett. I think I will come and pick one up. i have been meaning to call you and arrange a time to come and see you anyway. Will contact you over the weekend. James. [/quote] No probs...although I will not be home on Sunday....am going to the "Nostalgia Drags" at Sydney Dragway. BS.
Posted on: 11/17/2011 5:48 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10817236

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: jymster Ok, I will have to see if I can get a hold of a bendix clutch from somebody so that i can see how it works and then I can make my own. Maybe Ausjets have a cheap JJ one I could buy to work from? [/quote] Mate, I have ~5 of 'em at home, I can send you one if you like....or you can come a pick one up..! BS.
Posted on: 11/17/2011 4:49 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10817153

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: jymster What motor does the Lambert use? [/quote] To be honest..I don't know, there were no markings on it that I could see, although I wasn't looking that hard. BS.
Posted on: 11/17/2011 4:40 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10817144

RE: New JetJoe J-Junior 4lbs turbine
[quote]ORIGINAL: jymster Thanks Smithy, I think it was you that told me this in an email. Must be on my home PC. I will investigate this a bit further. Looks like the small bendix clutch from Wren might work. Will have to check the ID of the o-ring. [/quote] I'm afraid the Wren clutch is way too big, the JJJ compressor nut is only an 8mm hex and the nose of the nut is ~6.5-7mm, so the bendix drive "O" ring needs to be smaller than that.... Martin Lambert makes the only "commercially" available one at the moment, mind you, if you're handy with a lathe you could possibly spin one up in no time.. Cheers, Smithy.
Posted on: 11/17/2011 4:31 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10817124

RE: New JetJoe J-Junior 4lbs turbine
Yeah....The JJJ idles @ ~99-100k, max's out @ 240k. They require ~65-68k to self sustain depending on ambient conditions....however, what Frema says it quite correct, the small Atomic electric motor will indeed start the JJJ. Once the gas and fuel starts to flow it will help take the load off the starter and much higher rpms will be seen. A good example is the Wren MW54, they self sustain @ ~ 24-25k-ish, their starters will only "free spin" to ~18k depending on the applied voltage, however when assisted by the gas & fuel will easily run up to and over 30k which is where the starter is usually set to cut out via the ECU parameters, then the engine will happily accelerate up to the normal 40-45k idle from there.. I ran an auto-start Lambert Kolibri a few weeks ago and the starter would free spin the engine to ~38k using just 5.4volts, (it had a 6v electric motor setup), so it still had a bit in reserve. It started the engine fine with no drama at all. Great little engine is the Lambert. Cheers, Smithy.
Posted on: 11/17/2011 4:06 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10817094

RE: Russian Afterburner Featured at JWM 2011 video
[quote]ORIGINAL: on_your_six What metals are you referring to? Titanium? [/quote] No, titanium is not much good for this sort of thing, we're talking high temp stainless type materials such as Inconel, hastalloy and the like. John is correct about the "Skypipe" from several years back, I do remember seeing it. It's actually quite difficult to get a decent burning A/B system for our small engines, we can quite easily scale down everything mechanical, but it's our inability to scale down air and fuel molecules which can cause problems, giving the fuel enough oxygen and the time to burn is where we can find problems, as can be seen in both the above examples, the tailpipe is quite a bit longer than the engine itself to allow enough time for the fuel to burn within the can. The engine itself doesn't take kindly to reverse pressures generated inside the A/B can. One has to do their homework to work out the pressure ratios and fuel burn requirements etc... They're horribly inefficient and thirsty, for a 30% increase in thrust, you use ~500% more fuel..! When up to a decent rpm there should be very little flame visible outside the exhaust. If you've seen real jet dragsters in action, they do plenty of low rpm burns to give a nice fire show for the crowd. I try to do this when I do static shows with my little 1/4 scale dragster at my local drag strip. The "big" kids are the ones who enjoy it the most..! Me included. Cheers, Smithy.
Posted on: 8/10/2011 7:47 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10665111

RE: Russian Afterburner Featured at JWM 2011 video
[quote]ORIGINAL: George Anyone have other videos of the AB?[8D] [/quote] Here's a couple of vids of my Aussie 1/4 scale dragster with one fitted, not as clean burning as the Russian effort but works pretty well nonetheless. I get ~30%, (~10lb) augmentation depending on ambient conditions....on a nice cool crisp day it really cracks.....she's damn thirsty though, the A/B by itself will drink 1200ml of fuel in less than 30 secs...[X(] The car has been clocked at 146mph during a speed meet at a drag strip.....has working chutes too..!...[:D] http://www.youtube.com/watch?v=qk5-evHF1uA http://www.youtube.com/watch?v=Lu-UC5afVIM Cheers, Smithy.
Posted on: 8/9/2011 2:53 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10663145

RE: P-80 and similar turbines
Hi Vortex, The maximum rpm itself should not change, however, the performance of the engine will vary with temperature and relative altitude, less so with humidity but it still has a small effect. The ECU doesn't sense atmospheric conditions. As usual I stand corrected. Cheers, Smithy.
Posted on: 6/16/2011 8:37 PM by Author "knobby1" in the forum "JetCat Turbine Direct Support"
http://www.rcuniverse.com/forum/fb.asp?m=10578014

RE: What readily available Fuel/Oil can I use with super bee?
Hey Croc, Will need to get Eric's advice, and has been discussed many times here before..... Mobil Jet II is fine, many people use it. Also, any turbine oil which shows the specification "Mil-PRF-23699" will be ok, most commonly used turbine oils will have this specification. Be aware though that oils in this class can be dangerous to ones health if not handled and used correctly. DTE LITE is a good alternative and not as harmful/toxic. Handle all oils and fuels with care and common sense... you'll be ok. Cheers, Smithy.
Posted on: 1/23/2011 11:43 AM by Author "knobby1" in the forum "Jet Central Turbines - Artes Jet"
http://www.rcuniverse.com/forum/fb.asp?m=10282739

RE: 1/4 scale custom JET dragster
[quote]ORIGINAL: SGT.SHAGGY how much thrust? I have been thinking about a Jet Central turbine in a drag application for sometime now. Either a Super bee at 15.5 lbs a rabbit at 19 lbs or a super eagle at 30 lbs.. [/quote] Hey SGT.SHAGGY, What size car are you thinking of building? Also, depending on the weight/length of the beast, will determine the thrust class required. I have a 1/4 scale jet dragster using a Jet Central Eagle (30lb) sized "custom built" engine which also boasts an afterburner giving ~30% extra thrust. There's a lot to consider before you choose an engine. If you're using it for "drag racing", be prepared to get well and truly slaughtered by the wheel driven machines, the jet will have plenty of top-end but the acceleration off the line leaves a lot to be desired..! Cheers and all the best, Smithy.
Posted on: 11/28/2010 9:27 PM by Author "knobby1" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=10165674

RE: Looking for 1/6 F-104 Fuselage
How about an F-105 "Thunderchief" as an option?? Cheers, Smithy.
Posted on: 11/22/2010 3:56 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10152363

RE: Looking for 1/6 F-104 Fuselage
Hey Paul, Thanks muchly for the links. I can pretty much make the B300 fit into the 1/7,, will be a tight squeeze though, I can make alterations to the fuse though, it doesn't have to be exactly to scale or anything, I can widen and lengthen as required. Biggest problem I will face is heat management, the A/B pumps out ~1550c at full burn, The engine will be mounted as far rearward as possible too..... with some of the afterburner can out the back, plenty of heat shielding required methinks. Cheers, Smithy.
Posted on: 11/22/2010 3:46 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10152348

RE: Looking for 1/6 F-104 Fuselage
[quote]ORIGINAL: causeitflies Going for the land speed record are we??[:)] Good use for the afterburner. [8D] [/quote] As a matter of fact....yes!! I'm after the first run of 200mph for an RC car. The one I have at the moment isn't "slippery" enough and is somewhat limited by the drag etc... Am after a nice big engine for it too, possibly the big Behotec 300F, methinks 72 pounds of static thrust plus an afterburner should do the trick......Just have to convince Behotec to "allow" me to use one of their engines. The plan is to attend the world RC speed championships in the UK next September if I can get all my ducks in a row..! Cheers, Smithy.
Posted on: 11/19/2010 12:58 AM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10144748

Looking for 1/6 F-104 Fuselage
Hi All, I'm on the hunt for a 1/6 F-104 Fuselage for a project I'm working on, I don't need the whole aircraft, just the fuse. I'd appreciate any tips on where to get one in the Sydney, Australia area. Cheers and thanks in advance. Smithy.
Posted on: 11/18/2010 3:36 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10143640

RE: JetJoe OWNERS thread
Hi Guys, Essentially this is the only real way to do it, material removed from between the compressor blades like this is very common and an accepted practice, balancing engines as an assembly or "core" is a good way to get a very good result, although Wren have been able to get good results with their engines using the rotor only method. An experienced balancer will know where to remove material so as to not weaken the assembly, it's better to spread the mass removal over a larger area rather than a large mass from a small area. All the better engine manufacturers use this technique, Jet-Cat, Jet Central, Kingtech, AMT, Behotec etc...the larger the diameter of mass removal the less material has to be removed compared to closer to the hub. There's no need to disassemble the rotor after balancing which allows the recorded result to not be disturbed. A "rotor only" balance requires the assembly to be disassembled thus disturbing the result. A very good balance job can be obtained using this technique. The method Chrigui is using is spot on..! Cheers, Smithy.
Posted on: 9/23/2010 3:42 PM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10022488

RE: JetJoe OWNERS thread
Try mg-inch, the result is a much smoother engine and bearings last a lot longer.....although mg-mm is still very good. Thanks for your reply.
Posted on: 9/23/2010 3:57 AM by Author "knobby1" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=10021411