OK Doug, if it's OK with you this is what is going on the
web site. Six fit on a page better than seven.
Paul Lamar

Paul,
This looks great!   And, thank you Doug for setting up and making the
photos.  I would suggest labeling the first photo  "SUN GEAR = 000  &
1080"  to emphasize the 3:1 ratio.

Aubrey

Good point Aubrey.

Paul Lamar ...No rotor no motor.

Paul

Thanks for posting the pict.   So I guess this confirms the planet gear
revolves four times as the carrier revolves once.    T/0 at 2700 prop rpm
would then be 10800 rpms on the needle bearings.  2000 rpms cruise equals
8,000 rpm.

Aubrey

For you information I also did another observation to notice the planet gear
revolves once and the sun gear 270 degrees.

Now if have to decide to stay with the 15mm shaft or ream the mounting
holes, and increase the gear shaft diameter to 20mm.  A larger diameter
shaft would be stronger but the bearing needle rolling distance longer.

I think the way Bell retained the gear shaft pins with the prop shaft drive
plate it is fine for low rpms but perhaps a more modern way of containing
the gear shaft pins is called for with higher rpms.   Ford, Allison etc.
looks like they use a low profile nut.

Cheers


Doug

The Torrington limiting speed for a 5/8 bore full complement
needle bearing is 6200 RPM at zero load.

OK lets ignore that.

At 12,000 RPM the Speed Factor SF is 6

Basic dynamic load rating Cr is 1140 for 5/8 bore.

Load P = 250 pounds each.

Hardness factor HF is 1 for RC58 or above. No problem.

Life Factor is:
LF =  Cr/(SF x P x HF) = 1140/(6 x 250 x 1) = .76

Looking that up in the Torrington chart gives a
life of 200 hours.

Paul Lamar


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