Torsional Vibration and PSRU Design

Chain drives have the same effect.


Belt and chain drives do impose side loads on the front crankshaft journal,
however, so that is a negative point.


Another issue is packaging

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Well written explanation but this is incorrect. The sideload is imposed
on the rearmain journal of the crank, not the front one. Most redrives
that use the cog belt also incorporate an idler bearing outboard of the
lower sprocket, that prevents the sideload forces on the crank. Also I
think a multivee belt will not transfer 1000 hp, I don't think it would
evem work on my 330 hp+ auto engine powered plane. I will stick with my
cog belt, thank you.

Ben
www.haaspowerair.com