Is there any reason why the particular gear ratio between the
rotor and    the    output shaft (not sure if this is the proper
term) was chosen?  Would    there    be a way to modify this so that
the PSRU was essentially integrated into    the    motor?  So, for
example, so that 4 turns of the rotor were necessary for    one
turn of the shaft instead of 2?

    Just a thought, but might save alot of weight and one of the
major risk    factors of auto conversions.

    Thanks,
    Brannon

    I am not sure what you mean by "integrated".
    Can you come up with a sketch?

    Paul Lamar

   I think he is suggesting that instead of having the rotors turn
once for   three eccentric shaft revolutions you re gear the ratio
to reduce the e   shaft speed so that you no longer need a prsu.
Pretty sure the answer is  no   but I wouldn't be able to come up
with the why not (will seem obvious  when   you tell us). Would be a
big job anyway, just dealing with the loads on  the   shaft would be
challenging.

   John

   We had guy on here for years and he came come up with this.

   Paul Lamar

   I don't see how "Vances Folly" would work.  The stationary gear
and main  bearing are on the outboard ends of the engine.  Also,
that would put all  the torque on the rear sun gear.  So, I doubt it
would last very long.  And  then there is the balance issue.  Have I
missed anything?

  Mark S.

  Your not alone :)

  Paul Lamar

Not a hope in hell of changing the ratio of the planetary gear
inside the rotor. That would make the gear much larger than the
rotors actual dimension. Increase the rotor dimensions, you'll have
to build an entirely new motor, then those larger rotors will have
to spin on a std size e/shaft to keep the stationarity gears std
sized. Not a good idea when the std shaft suffers from flexing at
higher rpm with the rotors it already carries. The 12a has less flex,
 the rotors aren't much lighter than 13b, but the main bearings are
20mm closer together. Increase the E/shaft O.D. and the stationary
gear ratio increases so your back to the same ratio's as per
standard. Its a credit to the inventiveness of Felix that he found
this concept. Wankels system can only work with the 3 sided rotor in,
 that sized and shaped trociod housing, with the planetary/side gear
ratios provided. Change any of these factors and you get a lump of
scrap metal. Sam Watson



The rotor gears are not of a planetary design. Planetary gear sets are
composed of a sun gear, an internal ring gear and two or more planet gears
held in a carrier between the other two gears.

The rotor gears I believe are called internal spur gear.

Dale Davies

True dale but the planetary reference refers to the fact the center
of the rotor orbits around the e-shaft center while the rotor turns
on it own axis.

Paul Lamar