Peter Cowan/Lexi Cameron wrote:

Paul, I'm unclear as to your 10 to 15 lb difference number. Tracy lists, I believe, 42 lbs without flywheel. Marcotte gives 47 lbs WITH flywheel. Do I have these numbers wrong?
Peter.

You might. I kind of doubt that 47 pound number as the  very similar Power Sport 
design, weighs 65 pounds. Also Tracy's is heavier than it need be as the Ross is
about 35 pounds. The Ford four planet carrier  set alone only weighs seven pounds
five ounces. That includes the ring gear, planet carrier, planet gears and sun gear.
 A Ross style torsional spring plate weighs three pounds two ounces.
The Mazda auto tx flex plate and starter ring gear I estimate at less than five pounds.
That leaves just the shafts, bearings and the box. I do believe
with a bit of engineering effort the Ford based box could get down to under 30 pounds.

Here is a picture of all the Marcotte parts.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org