Mr Lamar, I saw in one of the emails that someone (or you) had said
 that the ford c9 planetary was better than the allison, having better
 gear set up amd engagement? I'm sorry to bother you about it nit for
 the life of me I can't find the discussion chain that has it , I read
 it last night.

 Rob Miller.

 The Allison  gear is four pinions but they are 1.4 inches wide and
 the Ford is .9 inches wide.

 The ring gear on the Ford is 4.6 inches in diameter and the Allison
 is 6 inches in diameter. So line contact length is not much
 different.t 4 X 1.4 is 5.6 inches for the Allison and 6 times .9 is
 5.4 inches for the Ford. Loads on the Allison teeth are a bit lower
 due to the larger diameter.

 The Allison however is much heavier but I don't know how much as I
 never weighed it cut down. Kevin has a big lathe so maybe he will cut
 one down and weigh it. It is too big for my lathe.

 They both are about the same reduction Ratio. The formula is C / A +
 1. C is the ID of the ring gear and A is the diameter of the sun
 gear.


 Paul Lamar

Ok thank you sir ! I thought that it said the c9 was stronger. I know
 I've read that it would be better to get a 4:1 reduction, so to
 achieve that would need to build a custom planetary? Would it be
 possible to copy one of them just in the correct ratios?

Rob Miller

There is some Jeep Transfer case planetary that is hard to find that will
work. Not as strong as the Ford. Very expensive to make one from
scratch as strong as the Ford.

Speaking of gear boxes here is a ten to one for the turbo compound.
The input toque is limited to about 15 foot pounds at 100,000 RPM and the output
torque is 150 foot pounds at 10,000 RPM. The out put could be connected
to the e-shaft with a multi V belt.  That ratio can be easily varied for tuning.
This is much cheaper as the gears are narrow  1/4 inch  wide and are off the shelf
more or less. MacMaster Carr.

The ring gear is stationary and power is taken out by the planet carrier.

It is a little over kill for a 2 rotor but would be about right for a 3 rotor.

Another way of doing it is feed the output from the compressor shaft
into the starter ring gear on the flex plate. The pinion would then be on
the order of  1.5 inch in diameter. That is real low cost  and efficient.
To get reasonable alignment the turbo would have to go forward and in  next
to the prop gear box.

Paul Lamar

The Rotary Engine free News Letter. Powered by Linux. If you want off
the list PLEASE let me know and I will remove  you.  ACRE NL web
site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
Copyright 1998-2017 All world wide rights reserved.

 The Rotary Engine free News Letter. Powered by Linux. If you want
 off the list PLEASE let me know and I will remove  you.  ACRE NL web
 site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
 Copyright 1998-2017 All world wide rights reserved