Engine Guru's Help- Os Grauperner wankel 30 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-22-2005, 07:27 PM   #1
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Engine Guru's Help- Os Grauperner wankel 30

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I have a wankel 30 made by OS and Graupner. It is more than 25 years since it last ran. I put in new OS wankel plug and it woould only start as long as the electric starter was turning. When the engine started I would remove the starter and the engine would immediatley stop running. It seems to have little to no compression. I'm not sure if it should have alot or alittle. I tried both 5 and 15% nitro caster based fuels and a 10-6 APC prop. I took the plane home removed the engine and stripped it down. Alot of dirt in it but nothing corroded or seized. Bearings seem to be in good shape. I' going to put it in anitfreeeze and crock pot to clean it up and have it look more eye appealing.
What should I be looking for and any other tips would be great. If I get to a dead end would there be anyone out there willing to take a look at it for me. I have contemplated sending it to hobby services to have them look at it but thats my last resort.It reatials new at GH for $449.00 so I don't want to just shelf it.
Thank you for any and all advice andf pearls of wisedom.
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Old 07-22-2005, 08:33 PM   #2
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I used to have one of these. No, they don't feel like they have much compression... they are quite different.

Are you sure it was getting enough fuel?
I think mine needed an idle bar plug....

I'm no engine guru but, hope this helps...
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 07-23-2005, 09:38 PM   #3
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Hello; I seem to remember that the early Wankles had quite a problem with their apex seals wearing prematurely. I believe that they came out with improved apex seals ina bout 93, and I think they were retro-fittable. We have a few around here, not many, not very popular.
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Old 07-26-2005, 07:49 AM   #4
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What you might check is that the Apex seals are not stuck in the compressed state. Dried castor oil "will cause the seals that are compressed against the combustion chamber walls" to remain in that condition. This will not allow them to seal properly for the combustion cycle. The springs for the apex seals are "leaf" style and aren't strong enough to resist dried oil.
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Old 07-26-2005, 11:54 AM   #5
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Following the comments I would only give this advise to start. While torn down I would order a complete set of seals (upgraded) to eliminate any leakage. Also the advise on the idle bar plug is also good as they did not have the newer plugs in those days. If my memory serves me right OS/Graupner came out in the early 70's with them in partnership with NSU(patent) and the seals where the problem. I couldn't afford one then or now but in Germany I can remember a lot of the German flyers bought them for scale.
John Davidson
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Old 07-26-2005, 07:00 PM   #6
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Thank you all for your advise. I ordered a set of springs and apex wipers for this engine from 2 different places and both are back ordered till the end of time. Thats Ok as I have another egine to put on in its place although it's not a wankel. A couple of you stated that I should use an idle bar plug. Is this better than the OS specific plug that was made for it. And is there a better idle bar plug than the fox and K+B.
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