Paul,
Here are some gears that are very similar to profile like on the Bell 47
gearbox.
http://www2.tech.purdue.edu/at/courses/aeml/powerplantimages/planetary2.mpg
http://www2.tech.purdue.edu/at/courses/aeml/
Doug Fir
Yes the PT 6 gears look a lot like the Bell parts.
--
Paul Lamar ...No rotor no motor.
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