Gordon Arnaut wrote:
Charlie,

Thanks for the insightful post. What exactly is the source of the torsional
vibration in the rotary? And how does it compare in severity to a piston
engine?

Regards,

Gordon.


The source is the same as in a piston engine. The fuel/air mixture is
has to be compressed right before it is ignited. The ignited mixture
then only provides power for about 60 degrees of rotation.

The negative peek is very small in the two rotor for two reasons.
First, the 8 to 10 pound rotor plus very large cranshaft provides a
significant flywheel effect. And second, the negative pulse is slightly
overlapped by the postive pulse of the other rotor; eg. the pressure
graph is actually the result of the overlay of the graph from two
independant rotors.

--
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."