Tracy Crook wrote:

Hi Paul;
     The contents of the front housing are three (3)
bearings...two (2) of which are 1-1/4 I.D. RADIAL
bearings, I would imagine the third one must be a Thrust
bearing.

     The output shaft is 1-1/4" DIA.

With this further information on hand, how about an
engineering review (synopsis)?
                                Thank you
                                       Butch Diaz Sr.

Everybody. Take out your tape measure and place your thumbnail on
the 1-1/4 inch spot and ask yourself. Do I want to risk my life
on a shaft this size holding a six foot diameter flywheel?

Paul Lamar

FWIW, consider this as an additional data point on the prop shaft diameter
discussion.  The prop shaft on my Rotax "B" version reduction drive is right
around 7/8" diameter and has been spinning a 3 blade 66" prop for about 750
hours.  There are a LOT of these redrives out there and I do not know of any
failures.  None of them are turning metal props as far as I know.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

Tracy,

What weight prop and what HP?  Both are critical.  With a low HP wood
or foam core composite, both the torque and gyro loads would be very much
lower than with a wooden higher HP prop (large blade chord increase for more
HP) and especially for a fixed metal or worse, a conventional constant speed
prop.  If the Rotax is a 50 hp unit and the prop has extremely light blades,
7/8" may well be fine, exp if no acro is done.

Bill

How about stalls and turbulence? Flexibly blade IVO props help too.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

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