As Lynn mentioned Rotaries do "interesting"
things when you get that torque to high.
You ARE using a psru, so the return torque is a
lot higher than what the engine dishes out.
The Mistral-"system" is lot more "streamlined",
than your different front(rear-housing) and PSRU.
It should work just fine, though depending how
much power you send through...
The Mistral site does not have the PSRU reduction Ratios or the RPM where
they are rating the HP. All very important.
For 190 HP at 6,000 RPM you need 168 foot pounds of torque. For a PSRU
ratio of 2.17
(like the Ford parts) that would give you 2,764 prop RPM ( supersonic
tips or close to it)
And 364 foot pounds at the prop flange and into the engine mounts.
For a 2.78 PSRU ratio you would see 467 foot pounds at the prop
flange and into the mounts. And 2,158 prop RPM.
For 230 HP at 6,000 RPM you need 201 foot pounds of torque. For a PSRU
ratio of 2.17 that gives you 436 foot pounds at the flange and into the
mounts. For the 2.78 ratio it would be 558 foot pounds at the flange and
into the mounts. Prop RPM same as above.
Still no problem.
Once you get close to 500 HP, I would be thinking about taking the torque
load out through the PSRU bell housing. Or through a plate between the engine
and the PSRU.
That 500 HP at 6000 RPM requires 437 foot pounds of torque. For the
2.17 ratio that would be 948 foot pounds at the flange and into the mounts.
For the 2.78 ratio that would be
1,214 foot pounds at the flange and into the mounts.
Racing Beat built a 900 HP three rotor for a Prescot Pusher. Many turbos,
and probably turning above 6000 so the boost would not have to be insane. But
it can be done.
Lynn E. Hanover
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