Paul
I had a few questions about the PSRU that is on the website.

1. Do you have any CAD drawing files available? I'm not up for machining this myself, but would like to have a drawing set to take to a machinist. I do have Rhino, but am a real newb at present - still going through tutorials.

2. Has anyone made and flown this design?

3. Do you think it would be better to use a an aluminum bar (solid) as opposed to the welded up pieces? I know it's a lot to hog out, but it does eliminate the casing weld. It doesn't cost much more for the raw stock, at least not hugely, although shipping I'm sure is more. The 6061 6 inch diameter extrusion is 138.77 for a random 10-12 inch length plus around forty for shipping.

Thanks,
Alan MullenColorado

You have a good eye for light weight engineering design Alan.

That is a real old design but good in a lot of ways. Experience
has taught us it is not the way to make a torsional isolator however.
I recommend this type rubber coupling which is  the same as we are using
in the 650 HP time to climb engine and gear box.

The other change is rather than use a traditional prop flange
use a ground adjustable pitch flange pioneered by Warp Drive
and adopted by Sensenich which is becoming an industry standard.

Seems like nobody every gets the fixed pitch right from the get go.

This was a reverse rotation 2.17:1 configuration GB. What is desirable
is a 3.17:1 same rotation gear box. A relatively simple change
where  the ring gear is held fixed and the power is taken out of the
planetary carrier.

I'll do a dwg shortly and send you an IGES. There are two NC shops
that are interested in making gear boxes. One in Colorado
and one in California. The California one is owned by Larry Childs

Larry Childs <larry@designitprototype.com>

The Colorado guy is http://www.rotarpower.com/#!

Randy A Power Design <randy@apowerdesign.com>

Working with one of them  or both would further the gear box experience
total for us all.

Paul Lamar

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