Paul,

Great pix from Reno, I hope you will post more.  I've been watching the discussion
on gears and I was wondering if anyone has used gears from
Lenco: http://www.lencoracing.com/
These are some of the strongest gearsets I've seen.  Another thing is that they
have straight cut--the teeth look very strong.

Rotary engines could definitely find a home in air racing.  A four-rotor has
got to cost less than what they're spending on those Lycoming and Continentals
if they can get the pieces from that bunch in Australia.

Steve Brazil

An 8 cyl Lycoming O-720 in the 1000 cubic inch class cost $110,000.
The crankshaft alone is $20,000 to $30,000.

Looks like Lenco have three widths of gears. 1/2, 3/4, 1, and 2 inch.
The stock Ford set is .9 inches wide.  The Lenco one inch ratios appear to be
reverse rotation with power taken from the ring gear.
Here is the one inch table.

Ratio-Planet-Sun-Ring
1.25:1 34... 23.. 91
1.28:1 32... 25.. 89
1.31:1 27... 25.. 80
1.34:1 24... 25.. 74
1.37:1 27... 31.. 83
1.41:1 24... 34.. 83
1.44:1 20... 32.. 73
1.44:1 22... 35.. 79 Stronger
1.46:1 22... 37.. 80
1.48:1 22... 40.. ??

Paul Lamar ...No rotor no motor.

Paul,
Sorry I didn't see the question marks sooner but:-
Planet gear= (Ring Gear- Sun Gear) /2
22             = (RG-40)/2
44             = RG-40
84             = RG.
The answers must be full numbers for SG - you can't have 1/2 a tooth!

Also those Ratio's don't appear right i.e. RG/SG
The Ford Planet gear is 78RG/ 42SG=1.85:1 (+1 for opposite direction)=
2.85:1
So:- RG   SG   PG   Ratio
       91    23    34    3.95:1
       89    25    32    3.56:1
       80    25
       74    25
       83    31
       73    32
       79    35    22    2.25:1
        80   37
        84   40    22    2:1
Am I missing something here ?
George (down under)

Take it up with Lenco. that is what they have on their web site.

Paul Lamar ...No rotor no motor.

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