RE: How does big two stroke engine sounds like ?
When it comes to sounding like a full scale plane, nobody will confuse a scale model of a P-51 or a Corsair making a strafing pass for the real thing, regardless of engine type. They don't sound like chainsaws, but then they don't sound like lawn mowers either.
The real thing is a complex mixture of engine, propeller, and airframe noises. Even if a model could accurately reproduce these sounds, the doppler effect would still be off because of the models slower speed.