We use Hurth gears for our rotary marine engines. The gears that are rated
for our engines (175 hp at 6250 rpm) weigh 58 lbs dry, and cost over $2000.
There are smaller, lighter, and cheaper gears on the market, but I don't
think they can handle the speed or the torque of a 13b -- we are always on
the lookout, so I'm interested also!

Jon Lauter
Rotary Power Marine Corporation

Is that a spur gear set Jon?

Paul Lamar

Bulent Aliev wrote:

Marine transmissions have reverse gear also, which complicates the design
and adds extra weight. I don't know of a marine transmissions with forward
only. Couple of years ago I was on this path of thinking and gave up.

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