I am looking for a drive for my single.  Tracy's drive is too heavy
for this application so I assume so would be all attempts at a
planetary drive.  Does that leave only belt drives?   Can anyone
recommend a drive?  Perhaps someone on this list (Paul?) could
design  a belt drive  that I could build?    Any guidance would be
appreciated.  Jerry

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I can design one and they are pretty easy to build but I doubt you
would save much weight over Tracy's PSRU as the torque pulse
from a single rotor is severe. The big problem is getting a large
12" dia. cog belt pulley made out of aluminum. Ken machined his own.

Ken Welter can tell you what his belt PSRU weighs.


Weight can be gotten out of Tracy's
drive if you are willing to do a bit of machining on the housings.
A lot can be done with just a lathe.

Perhaps Richard Sohn can fill us in on the weight of the PSRU  he is
planning on using.