Have you guys downloaded the Chip Hyde Bipe?? If not you need to. It took me a minute to figure out what was going on but there is an element of comedy in the engine. When the plane is sitting on the runway the WHOLE SCREEN shakes, I believe its suposed to be from the supposed "lope" of the big powerful 200CC engine... IT actually sounds like a real fullscale engine.. You can see the landing gear bouncing around a little when it is sitting still. It has an almost ominous sound in the air with the low pitched high performance sound.. The plane is ok to fly, but the sound is priceless...