RE: Roto motor 35FS
it is normal for a four stroke engine which is not supercharging
Posted on: 9/12/2012 1:39 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11226447

RE: Am I the only one who flies pattern with no mixes in their plane ??
it is my case on may last pattern only rudder give a very small deviation on tail is necessery. for the rest no mix
Posted on: 9/12/2012 10:46 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11226265

RE: RCGF Engines
the RCGF 32 is a 34 cc (you can calculate), the RCG from HK is a 30,5 cc. and there is a big difference in power. I use RCGF 32 on a F3A pattern : [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/458360temptation12.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=18391501092012233.jpg][img]http://img4.hostingpics.net/thumbs/mini_18391501092012233.jpg[/img][/url] https://lh4.googleusercontent.com/-zmZ4FEkqwAU/UE5LVg8TBwI/AAAAAAAADJE/ItD90DsajqI/s512/P1030658.JPG https://lh3.googleusercontent.com/-wlDPP1RLxTs/UE5JXoq-QhI/AAAAAAAADIw/pZkDNMEb8Bk/s720/P1030656.JPG stephane
Posted on: 9/11/2012 12:51 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11225289

RE: post some pictures of your pattern plane!!
some pics of my plane after the first fly : [url=http://www.hostingpics.net/viewer.php?id=18391501092012233.jpg][img]http://img4.hostingpics.net/thumbs/mini_18391501092012233.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=62552801092012234.jpg][img]http://img4.hostingpics.net/thumbs/mini_62552801092012234.jpg[/img][/url] stephane
Posted on: 9/11/2012 6:23 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11224881

RE: European Championship 2012 are you in...
Hello Claude, I'll confirme, and I have seen Christophe flying inlast may when it came at the club for the for the first selection that we organize, and he was at a very ggod level earlier in the season near its best. stephane
Posted on: 7/24/2012 8:46 PM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11168145

RE: post some pictures of your pattern plane!!
hello, my new plane is quiet finsh and I post you some pics. [url=http://www.hostingpics.net/viewer.php?id=89639130082010351.jpg][img]http://img11.hostingpics.net/thumbs/mini_89639130082010351.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=98580922052011453.jpg][img]http://img11.hostingpics.net/thumbs/mini_98580922052011453.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=85993411122011063.jpg][img]http://img11.hostingpics.net/thumbs/mini_85993411122011063.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=69791923032012194.jpg][img]http://img11.hostingpics.net/thumbs/mini_69791923032012194.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=84747023032012189.jpg][img]http://img11.hostingpics.net/thumbs/mini_84747023032012189.jpg[/img][/url] now it is time to put the engine, the RC and some accessories into the plane and it will be time to fly :) : ) stephane
Posted on: 3/23/2012 1:58 PM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11012218

RE: DLE 30 canister power
canister is not a tuned pipe and often the canister is assciated with flexible header whitch produced too much turbulence in the gas flow. so that the supecharging due to the pressure shock wave is drastically reduce near zero. stephane
Posted on: 3/9/2012 9:36 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10992999

RE: RCGF Engines
In reply to your questions : I have the RCG 30 and the RCGF 32 and I have compared them. RCG and RCGF are quiet the same indesign. there are some few differences such as the volume svept for exemple : the RCG 30 has got 30.5 cc (bore 36 mm and stroke 30 mm) its power equipped with a tune pipe is quite the same than a ys 170 DZ. the RCGF 32 has got 34cc of volume svept (38mm of bore and stroke = 30mm) you can calculate the result is 34cc and not 32. I have measured the dimension of these 2 engines and it is the results of my measures that i give you. after there are small aspect faults on the RCG compared to the RCGF and it can explan the lower cost of the RCG. if you want only a 30cc and you want to reduce cost you can buy the rcg it will run correctlly. stephane
Posted on: 3/9/2012 9:13 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10992962

RE: RCGF Engines
well, I bought the RCG 30cc at the HK store and a RCGF 32 at the store of the french dealer of RCGF. and I confirm your remark on the packaging. what I think is that RCGF made second choice engine for the chiness market and the first choice is exported. stephane
Posted on: 3/8/2012 11:52 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10991682

RE: DLE-30 idle and vibration problems
are you sure that all seals are good between the carb and the angine . or that any fixation screws are correctly tighten ?
Posted on: 3/5/2012 10:04 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10987483

RE: DLE 30 vs. RCGF 32
hello MTK, I read a great part of your posts on the OS33gt. the problem of power does not concerned the OS 33gt but the use of the hatori header. I explan me: All exhaust chambers ("big muffler") can be tuned and expecially the hatori and for none conical shape the tuned range is very narrow. in the hatori case this header is not tuned and the length is very too small, consequentlly the loss of power can be more than 1000 rpm on the same propeller compared to the correct tuned. in my case I used the tuned pipe of the webra 145 AAR and a self made header : [url=http://www.hostingpics.net/viewer.php?id=88033923012012114.jpg][img]http://img15.hostingpics.net/thumbs/mini_88033923012012114.jpg[/img][/url] regards stephane
Posted on: 2/20/2012 1:29 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10967878

RE: DLE 30 vs. RCGF 32
hello MTK, props are given in this link http://www.hostingpics.net/viewer.php?id=742902tableau.jpg regards stephane
Posted on: 2/19/2012 11:52 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10967007

RE: DLE 30 vs. RCGF 32
hello Jeremy, I bought this engine last summer in oder to equipe my new patern f3a plane. I' m running some tests to evaluate its potential of power and I am very impressed by the results : this engine as much as powerfull than ys 170dz cdi running with 30% of nitro. for your help find the power and torque curves of the RCGF 32 and some wellkown engines. sorry for the curves in french but I give you the some translations. for the torque [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/665511couplediversmoteurs.jpg[/img][/url] for power : [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/803000puissancedivesmoteurs.jpg[/img][/url] sorry curves are in french, for your helps : reso = tuned pipe ; pot echapement = canister ; couple = torque ; puissance = power ; vitesse de rotation = RPM http://www.hostingpics.net/viewer.php?id=742902tableau.jpg regards stephane
Posted on: 2/19/2012 1:32 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10966267

RE: RCGF Engines
hello Gerrit-Jan here one part of my post in RC pattern flying about measurement realized on YS engines : I take measurement of rpm that all members of the forum post on RC universe and on F3A.fr. it is interested to see that all measures was realized with APC propellers and it is more simple for me because it reduces drasticlly the number of Link this word and every other one like it in our forum to YOUR Website! prop to caracterize in power. for RCGF and webra I used my own measures because I have these engines at homre. after you must know one thing : when your engine runs a prop the power absorbed by the propeller is eqaul to the power provided by the engine, so if you measure the curve power of your prop it becomes easy to determinate the power of all engine just by knowing the dimension of the prop and its rpm. and you can write : where N is the RPM and D the prop diameter and gamma the power coefficient of the prop. stephane PS : sorry for my english, I am no native english
Posted on: 1/24/2012 1:13 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10925523

RE: Will YS ever go gas/petrol?
I'm flying on the FAI schedules ten years ago, so this year I'm flying on the P13 and if I have time I try to train me on the F13. stephane
Posted on: 1/24/2012 8:19 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10924967

RE: Will YS ever go gas/petrol?
Hi everybody, well yesterday evening I took some time to make a photo of my plane with the RCGF 32 :) [url=http://www.hostingpics.net/viewer.php?id=68557423012012111.jpg][img]http://img15.hostingpics.net/thumbs/mini_68557423012012111.jpg[/img][/url] [url=http://www.hostingpics.net/viewer.php?id=88033923012012114.jpg][img]http://img15.hostingpics.net/thumbs/mini_88033923012012114.jpg[/img][/url] stephane
Posted on: 1/24/2012 1:48 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10924528

RE: Will YS ever go gas/petrol?
I'm happy of yours reaction and your remarks, thank to A Periera for the measurement of its engine on 19x11 and 20x10,5 APC, and I confirm you that your engine is very powerfull but all I read on RC universe concerning the 170CDi and what I see is just bit lower. In my oponion of Patern pilot is that the power of a good DZ or 2T OS or webra is enough to realized correctly (8 at each manoeuvre) a P11 or a P13 now for example. after it is possible to have more power it gives comfort during piloting but I remember me when I'm a biginner I have problems with to much power too. Now I enjoy explore some ways which are not commun or evident for most of us. As Claude (papone) cheers me I speak you soon of my next F3A plane equipped with a RCGF 32. this plane is almost finish. stephane
Posted on: 1/22/2012 12:31 PM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10921693

RE: Will YS ever go gas/petrol?
Yes Claude, it is normal Christophe said always that ;) ;) ;) [quote]ORIGINAL: papaone Hello Steph Last year friend of mine saw CPLR testing a Yamada 200 on an Axiome. CPLR told him "it's a raging ". As former french team member, any information about ? Claude [/quote]
Posted on: 1/22/2012 11:31 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10921571

RE: Will YS ever go gas/petrol?
hello Keith, about measurement realized on YS engines : I take measurement of rpm that all members of the forum post on RC universe and on F3A.fr. it is interested to see that all measures was realized with APC propellers and it is more simple for me because it reduces drasticlly the number of prop to caracterize in power. for RCGF and webra I used my own measures because I have these engines at homre. after you must know one thing : when your engine runs a prop the power absorbed by the propeller is eqaul to the power provided by the engine, so if you measure the curve power of your prop it becomes easy to determinate the power of all engine just by knowing the dimension of the prop and its rpm. and you can write : [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/209285formule.jpg[/img][/url] where N is the RPM and D the prop diameter and gamma the power coefficient of the prop. after in my case measurement have been done with a good weather and a temperature near 20°C, it is some classicals conditions. the difference that you pointed at 7200rpm is justfied by the difference of the prop sized that they run at this RPM . the 170 cdi run a 20x10.5 and the 170 DZ only the 19x11. in the case of the 19x11 the 170cdi runs this at 7500-7600 rpm. 7700 in the case of CPLR engine. it is interested to see that the 170DZ becomes very powerful up to 8000rpm it is for that reason that the best prop on this engine is the 17x12. for 2T engines differences is not so great and and at low rpm (under 8000rpm) the advantage is for 2T such as OS or Webra. but in their case they arrived so early beacause the best prop for them is 18,1x11 which run at 7600 7700 rpm in fact 200 to 300 rpm faster than the ys170DZ. stephane PS : sorry for my english, I am no native english ;)
Posted on: 1/22/2012 5:12 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10920947

RE: Will YS ever go gas/petrol?
hello bjr_93tz I think you stay on a prejudge comming from before the liberalization of the volume svept of the engine in 1996. after it is not the case 2T and 4T have quiet the same volume svept and if they turn the same prop at the same rpm they have got the same power and torque (it is only physics) I collect some measurements that all pepoles post on RC universe and french forum too or I made on RCGF and Webra and after caraterised some propellers in power Il plot some curves. I think there are very interesting :) for the torque [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/665511couplediversmoteurs.jpg[/img][/url] for power : [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/803000puissancedivesmoteurs.jpg[/img][/url] sorry curves are in french, for your helps : reso = tuned pipe ; pot echapement = canister ; couple = torque ; puissance = power ; vitesse de rotation = RPM the fuel for the YS engines is 30% of nitro. for the webra 160aar : only 10% of nitro and for the RCGF 32 : gasollin (french SP95) with 3% of oil. these curves demonstrate one thing : there is not only one solution but a set of solution : I explain me : YS is a solution (a very expensive solution) but not the only one; 2T are not died and are good solution for beginners, electrics is an other solution (expensive too) and the future is probably gasoline as show the curves because costs are divided by 3 compared to YS or electrics and power is here ! stephane [quote]ORIGINAL: bjr_93tz A point lost in all this 2-stroke/4-stroke efficiency discussion is that twice in the recent history (last 20 years) of F3A, 2-strokes got dumped very quickly as soon as a decent 4-stroke alternative came along because they turn bigger props at lower RPM and have bottom end grunt. Characteristics I might add forced upon us by the design of the schedules, because a snaproll at the bottom of a loop or on an up-line is a far better way to determine the skill of a pilot than a snaproll in a down-line or at the top of a loop. [;)] Electrics turn even bigger props at even lower RPM with even more bottom end grunt, but like everything there's a happy medium and you just can't keep halving the rpm and doubling the torque without introducing new problems. Two-strokes in a heli are a whole different ball game because they're always up on the pipe, running in their sweet spot waiting for the command to dump their available torque into the gearbox. A geared, constant rpm 2-stroke in an F3A ship with a variable pitch prop would probably work well but it would be a whole new sound for the judges to get used to ??? [/quote]
Posted on: 1/22/2012 1:38 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10920786

RE: Will YS ever go gas/petrol?
hi guys, I agree with your demonstration but the formula you give only and your demonstration only allow to compare atmospheric engine between them. you forget a little detail which change all. ;) the YS 4stroke are supercharged and in this case the effective volume of mixture pumped to be burned in the cylender is greater than the volume svept of the engine . in the YS 4stroke engine the supercharging effect is achieve by to systeme : first : it is the rotary valve which produce the overpressure in the cylinder during the pumping but it is not enough secondly : the fuel and especially nitromethane allows to give more oxygen in order to supercharge the engine, it is for that reason that people use 30% of nitro in the fuel for example if you suppress nitromethane in the fuel, there is not any interest to use an YS instead of others engines running without nitro fuel.
Posted on: 1/21/2012 9:06 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10919610

RE: RCGF Engines
thanks for your answer, as i have some time i do mesurement of these prop. and you can see the results on the following table : [url=http://www.hostingpics.net/viewer.php?id=742902tableau.jpg][img]http://img11.hostingpics.net/thumbs/mini_742902tableau.jpg[/img][/url] as i have few time yet ;) I done orther measurements : [url=http://www.hostingpics.net][img]http://img15.hostingpics.net/pics/803000puissancedivesmoteurs.jpg[/img][/url] the used tuned pipe is this used on the webra 145AAR. I think it is very interesting because I only have SP95 for the RCGF and there is 30% of nitro for all the the tested YS stephane
Posted on: 1/8/2012 10:35 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10897995

RE: RCGF Engines
thanks for your ansewr Capmicom, in your opinion, is the 20x10,5 APC prop can be ru by this engine with or without tuned pipe ? for me the objective is to run it over 7000rpm stephane
Posted on: 12/23/2011 2:33 PM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10873435

RE: RCGF Engines
hi guy's is someone use the RCGF 32 ? what do you think of the use of tuned pipe on this engine ? stephane
Posted on: 12/23/2011 2:22 AM by Author "steph18" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10872584

RE: OS 33GT Gasoline Engine for Pattern
Hi Mattk why you don't used a tuned pipe on your OS33gt. the tuned with a good tuning provides about an increase of 500 to 600 rpm but it is not the case with the canister . for exemple I'm runing tests on the RCGF 32 and the using of a tuned pipe on the APC 20x10,5 and the 19x11 allowed me to obtain theses results : [url=http://www.hostingpics.net/viewer.php?id=742902tableau.jpg][img]http://img11.hostingpics.net/thumbs/mini_742902tableau.jpg[/img][/url] regards steph
Posted on: 11/22/2011 1:52 PM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10821063

RE: Yamada YS 175 CDI
thanks Alejandro for your helps, have you done good flights ? I know what you say for the increase of RPM in flight I interested in the performences of engines serie''s and not in the performence of "selected or prepared" engines as it is the the case for Benoit or Christophe engine. regards steph
Posted on: 11/5/2011 9:49 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10798011

RE: Yamada YS 175 CDI
<![if gte mso 9]> Normal 0 21 false false false MicrosoftInternetExplorer4 <![endif]><![if gte mso 9]> <![endif]><![if gte mso 10]><![endif]> Hi Alejandro, Thanks for your answer, and I have got ananother question: is the value of the RPM that you give is coming from a measurementor is it an estimation ? Few years ago I used with success YSengines and I well known Christophe and Benoit because I followed them during 3years ago when I was team manger, in these conditions I well known tooadvantages and inconveniences of YS 4strokes engines. My interest is in the performance of this engine, I researcher measurement and not impressions. regards steph
Posted on: 11/5/2011 6:20 AM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10797807

RE: Yamada YS 175 CDI
Apereira gives some general caracteristic of the YS 175CDI but is anyone which do RPM's measurement on some propellers such as 19x11 apc or 20x10.5 apc ? regards steph
Posted on: 11/4/2011 1:44 PM by Author "steph18" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10796907