How does the PSRU manage torsional vibration?
Concerning torsional vibration: The object is to prevent a resonance vibration from going unstable and amplifying itself damaging the propeller or crank shaft. What I mean by unstable resonance is an oscillation where the magnitude of the swing is increased on every oscillation cycle until infinity. This happens where the natural resonance of the elements of the PSRU and propeller are at the same frequency as the engine power pulse and its harmonics. The solution is to first use heavy components like sprockets, shafts, and flywheel that use momentum to dampen and reduce the power pulse. Note that the power pulse of a V8 engine is already much smoother that a V6 engine because of the 90 degree verses the 120 degree firing order of the two engines. Also there is a natural dampening characteristics from the centrifugal force on the floating HyVo chain preventing the power pulse from reflecting off the prop vibration. The slack on the one side of the chain is what keeps any oscillation or
