I fly in front of 4 double V-belts, routinly seeing short bursts of 280 hp

and constantly seeing at least 205, with plenty of powerchanges on the way.
They last at least 2200 hours (where they get changed anyway). Additionally
they get used as a engagement clutchfor a min of 2500 times, to connect the
engine with the rotor drive. Can't vote for it, but the most heat they get
is actually from the engine and not produced by themselves. If your belts
can't handle 170 hp you have something wrong in the gear design.

Thomas,
Actually the vee belt drives seem to do better than the cog belts. It you don't need a timed connection vee belts work very well. I designed the cog belt
drive exactly to the  HTD specs. In fact I used over the counter sprockets carefully bored to fit. Still had problems. Usually a sudden shearing of the cover
material on the tooth side of the cog belt.
Bill Jespon

 
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