According to the chart that Paul posted, on a two rotor, the power pulses
overlap so the torsional vibration amplitude should be less than a
four-cylinder, four-stroke piston engine but the frequency will be the same
at the same rpm.

Steve Brazil

That is correct. Here is a chart I just scanned from old Curtiss Wright papers.
This must have been a very large engine.

Paul Lamar ...No rotor no motor.

Just to add to the confusion, it is my understanding that the leading
coils fire twice per rotor face combustion event.
The leading coil is a two-post coil that fires both leading plugs
together in a wasted-spark configuration.
The trailing coils are two completely separate coils firing the trailing
plugs sequentially.

Cary

Cary,
Do you know the timings of the spark events?
George (down under)

Nope.
Cary



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