- Oct 18, 2003
- Saline Michigan
=probleme with english...how this avoids torsional resonance
Your English is WAY better than my Polish, so let's work with what we have here.=probleme with english...
=engine shaft (engine momentum) drive both propellers via sattelite beavers,whitch axe is mounted in gear case...
first propeller is mounted to the case, second to the output beaver.
the propellers are louded togather via air "transmission"=no resonances...
=resonans effect is depressed by dampfing phactor (the "air dampfer") and amplification of amplitude can be small...it will be in resonance and will amplify...
You are trying to tell us that air friction absorbs enough energy to fight resonance? Normally aspirated gasoline engines make about 2500 rad/s/s, at 2700 rpm and 2 firing pulses per rev, the firing pulse swing is about 0.45 degrees one way, or about 0.9 degrees full swing. Air friction on this oscillation is really tiny, and will not remove much vibration.=resonans effect is depressed by dampfing phactor (the "air dampfer") and amplification of amplitude can be small...
-in practice system works good withaut vibration dampfers.
BTW=we have GENIAL centrifugal clutch/rubber dampfers constructed by Bogdan (100 HP, 1 kg !!!)
"All" is a pretty bold statement considering one of the most successful aircraft reduction drives in history has a 2:1 ratio. Thousands have flown and are still flying.There is no comparison of the TV induced by a camshaft compared to a propellor. As I said all of the successful PSRUs, either toothed belt or gear use an uneven ratio, Rotax is the best example.