Paul,

 We are analyzing VTOL with two separate rotors powered by
 Mazda rotary engines. We wish to use identical gearboxes but,
 engines with opposite rotation direction are needed.

 Is it possible to take power from Renesis from opposite side?

 Sincerely,

 Viktor

 Yes but you will have to machine a special E-shaft with
 increased diameter on the front end. Also a new front
 cover to transfer the torque from the gear box back to
 the main part of the engine.

 Paul Lamar

Viktor,  If you ae intending to build up the accessory end of the E-shaft
by welding it needs to be done around the shaft  rather than in passes down
the side. You go round and round like screw threads. If you weld passes
along the length the shaft will be visibly bent from heat stress. It would
be best to use 4340 as the welding filler to be most compatable with the
E-shaft material.The build up would be a minimum of .125 larger than the
front timing gear journal then turn and grind back to that diameter.. By
turning the end taper to the same as the flywheel end a rear balance weight
could be used.
       Using the crank angle sensor for ignition and oil mixed in the fuel
for lubrication their drive gear becomes redundant. The chain drive oil pump
could be replaced by an external milodon or barnes dry sump pump.
       A major concern is how to replace the thrust bearing  stack which
sits in front of the stationary gear. This bearing prevents the e-shaft
lobes from wandering around lengthwise of the engine and contacting the side
housings. On the mazda engine the front pulley hub slides over the end of
the shaft compressing the sprocket, gear, and thrust bearing spacer and
shims tight against a shoulder on the E-shaft when the end bolt is
tightened. Using a drive hub/counterweight on the front would seem to
preclude the original thrust bearing type installation.
        With all these concerns it would seem that reversing the rotation in
the gearbox or before the gearbox would be the better plan. You could also
CNC some mirror image side housings and turn the rotor housings around to
make a left hand version of the engine. I think Jeff has CNC modeled these
parts and we have seen the quality of his work. You might  want to contact
him and see if he is interested.

george grimes

Paul and George,

Thank you very much for answer. I agree that the easiest way is to
design two different reduction gearboxes - also it will be more
reliable and (hope) lighter. Every gram is counting.

Our goal: two person in tandem VTOL aircraft, max tow 1200kg/2670lb,
power rotary 2x300hp, rotor diameter 2x4.5m/15f, wing area
4m2/44.4sqf, wing sailplane laminar airfoil 20%-18%, wing span
6m/18f, airplane minimum drag coefficient Cx0 0.018, composite type
structure. Machine can be fast if the problem with rotor flutter is
solved. We would like to use turbo compressor charged Renesis
rotary. Grateful for suggestion and opinion.

Sincerely,

Viktor