tersey said:Those were the engines that spun on their axis, right?
There was a cool show on how those radial engines affected the way pilots
flew planes. Apparently they threw the centre of gravity off and planes with
these engines had to be flown a special way.
Many of the pilots who couldn't figure this out ended up crashing.
The propeller generates a force to the (IIRC) opposite side of the direction the prop spins. If you increase throttle or if you rev throttle to take off, you need to apply hard rudder to counteract this force.

