A fumigation R/C model airplane

Most small gasoline model airplanes and motocross bikes and  go-karts engine's are 2-stroke piston engines like this.
Usually model airplanes use glow-plugs, they don't use a magneto-driven pulsating spark-plug like go-kart and motocross engines.

 
The exhaust pipe acts tuned with the engine for maximum efficiency

Typical modern highly efficient sailplane  

Flying wing R/C model and a glider or sailplane  

F-14 push-propeller R/C model airplane  

The F-100 Sabre  

A real F-18 Super Hornet jet - sonic boom mach 1  

Another kind of jet breaking the sound-barrier

This photo shows the Russian "Crocodile," Mi-24  Ka52
Apache - the U.S.A. equivalent combat helicopter. Below you have the home-made mini-jet "BD10" video

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This is another nice set of related photos This is page 6