4.9cc rotary content or my Wankel is tiny

"bugattatra - parallel double-park that muthafucka sideways" (bugattatra) 04/19/2015 at 17:18 • Filed to: None

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So I just scored this amazing little gem. It’s a vintage, no longer produced OS/Graupner Wankel. 4.9cc, single rotor, about 4.9 HP (!).

I’d eventually like to build a display/test stand, but in the meantime I’ll need to keep it healthy.

It has great compression and I do have the muffler though it’s not pictured here.

Can anyone with nitro RC plane experience give me some tips on how to maintain it while static? Is there a certain type of oil I can inject into the ports? How do I maintain apex seal health? Is it safe to turn over by hand from time to time?

Thanks in advance.

E. Julius > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:20

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!!!! Awesome!!!

4muddyfeet - bare knuckle with an EZ30 > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:22

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They almost look like they’re supposed to fit together.

Meta wankel.

Sampsonite24-Earth's Least Likeliest Hero > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:29

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That’s kind of cool

tromoly > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:31

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That’s really inefficient, I have a 3.44cc piston engine putting out somewhere around 2.5-3hp in my buggy.

Pack it in after-run oil, that’s how most Nitro engines are stored. Though I’m not sure if it would have apex seals, not too up on my OS Wankel engines so really don’t know on that.

LappingLuke > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:34

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Shoot some WD-40 in it and turn it over several times and you’ll be good to go! Very cool score

EDIT: spray it into the carb, if you didn’t know

aberson Bresident of the FullyAssed Committe > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:35

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don’t know much about the airplane side of the hobby but i found this neat manual

http://manuals.hobbico.com/osm/rotary49pi…

bugattatra - parallel double-park that muthafucka sideways > tromoly 04/19/2015 at 17:36

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Oops. Quoted wrong source. 4.9 HP.

They all have apex seals. Thanks for the suggestion.

LappingLuke > tromoly 04/19/2015 at 17:36

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That 2.5-3 hp is probably very optimistic...

bugattatra - parallel double-park that muthafucka sideways > aberson Bresident of the FullyAssed Committe 04/19/2015 at 17:44

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Great, thanks! Ordered some after run oil as suggested elsewhere and in the manual.

Cé hé sin > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 17:50

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4.9cc, single rotor, about 4.9 HP (!).

Lots of !s. 1,000 bhp/litre!

tromoly > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 18:08

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Ah, that number sounds better.

And on the after-run oil, put a few drops down both the throttle body and exhaust port, then turn the engine over a few times, if you want do it a couple times with the crank at different spots just to make sure the rotor gets totally covered. Don’t worry abut putting too much oil in the engine, any excess will come out as the rotor spins.

tromoly > LappingLuke 04/19/2015 at 18:11

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Not really, the higher-end engines by OS, Novarossi, and a number of others have quite a bit of power to them. And remember that RC Nitro engines run between 20% and 30% Nitromethane, they have a bit of power to them.

bugattatra - parallel double-park that muthafucka sideways > tromoly 04/19/2015 at 18:22

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Thanks again. Is clockwise (with crank/front of the motor facing you) the correct rotation normally?

tromoly > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 18:36

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I have no idea for airplanes, in my buggy the engine rotates Counter-Clockwise using the same orientation. Did it come with a manual? Again I don’t know much about airplane engines, but it might say in there.

Frank Grimes > bugattatra - parallel double-park that muthafucka sideways 04/19/2015 at 18:43

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oh apex seal I read it as “maintain sex appeal health” and was looking forward to the responses.