Bob Smith Industries 900x250 v2

RC Airplane Engine Assembly Video

graupner o.s. wankel 30

This disassembly and reassembly video from Academia Motor may just be the best thing you’ve watched yet in 2018 — really! Some internet sleuthing shows that the Graupner-O.S. Wankel .30ci powerplant was the world’s first model rotary piston engine. A collaboration between Graupner and Ogawa Model Mfg. Co. (O.S.), it used Felix Wankel’s design with a rotating triangular piston in an epitochoidal shaped chamber. It was first marketed in 1970 with a price tag of just $87.50!


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  1. Very interesting video. What is the engine displacement ?

  2. Nice engine but to many components required for a complete unit.

  3. As noted on the video introduction the engine displacement is 0.3 cubic inches.

  4. interesting, however it is a small engine.

  5. I am one of the few owners who has a Wankel engine since 1971 and still using it in a little parasol airplane 300 SQ inches wing area.
    Due to the small displacement (0.30) it is not powerful, but it is very reliable .
    I had to buy extra spare parts to keep it running .
    The sound is nice, and there is no vibration.

  6. Excellent video technique…. Should make professional stop motion movies for a living. Thank you.

    Michael Reiman
    Palm Beach, Florida

  7. I have both the first model and the second model OS .30 Wankel engine. In the 70s I flew a .40 size Model called the Dart with the first version. A profile model with the radio and servos in the wing. The engine had plenty of power and flew the model very well. The second version of the engine has about 3/4 more power then the first version. Higher rpm and much more torque. It is now in a Cessna C37 ARF model and she goes like a rocket. Sweet engine. Like you said I like the sound of it. Mainly when it idles. Weird sound.

  8. I had one those in the mid ’70s. Very anemic for a .30 glow engine. Bench run only. Started easily, ran well but was very thirsty. I sold it around 1980. Lost track of it after that.

  9. Like to see a 60cc gas engine version be awesome in a p47 Th. or Corsair

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