Bill Freeman wrote:

  So is it about 10 planet gears and about 2" of tooth width?  What
about the sun gear size?   This is an interesting example to compare
with others.   At normal cruise of about 2500 hp, assuming about
2000 rpms, the torque would be 6565 ft-lb.  WOW.

For the Mazda, say 200 hp at 2700 (prop) RPMs, gives a torque
of 389 ft-lb.   So, the R4360 gearbox can carry almost 17 times the
torque which a Mazda PSRU needs to carry.

Wrathall Mark wrote:

The "corncob" was used in the late model super Corsair - Goodyear F2G. I
have seen it listed in the Reno results of the past. I bet they were feeding
a hell of a lot more than 2500hp through that box. The reduction ratio is
very low.

Mark Wrathall

Bill Freeman wrote:

Absolutely correct, Mark.  I had the pleasure of working the pits at the
Kansas City Air Races a few years ago and towed the Super Corsair, a
home-conversion of the corncob Corsair.   Also "Dreadnought" was there
and was second - it is a Sea Fury with a R4360.  Since the Dreadnought
team is on a pretty tight budget, they hold the power down to about
3000 or so in the race - the pilot told me "I have to fly that thing back home!"

My Dad observed the original carrier landings of the corncob Corsair.
The pilot "took the cut" (chopped the throttle, as is std proceedure for
piston carrier landings) dropped the Corsair on the deck and the
engine mount broke, with the entire engine, prop and cowling tumbling
down the deck.   After cleanup, this was repeated exactly by the
#2 bird, after which they decided that this wasn't really working very
well.  Few of the big Corsairs were built, fewer survive.

As the the gearbox, does anyone know the crank to prop ratio??

Bill
Long EZ builder & pilot
mechanical engineer

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org