I used to be into those gas (nitro) powered model airplans with my dad when I was younger, and I remembered hearing of this engine, so randomly today I decided to check it out. OS Engines makes this 4.97cc single-rotor carbed Wankel model that puts out 1.97-ps@17000 rpm! Pretty sweet and interesting.
http://osengines.com/engines/osmg1401.html

wants one! :evil_laug