situation. BTW, I have located a planetary gear set with 2.4:1 ratio.

It

is used in a Borg Warner35/40 transmission, very common in  Falcons,
Valiants Toyotas and Sigmas and even some 6 cyl Jags in the 80s.

. Dave McC

Dave Mc C.
What sort of  HP can thePlanetary handle and what did it cost you.
George (down under)

The Jatco auto transmission used in  Toyota's and Mazda's is a scaled
down version of the C6. Jatco is jointly owned by Ford and Toyota.
One of the reasons the C6 is so popular for PSRU's is the main part like
the planet carrier is a separate piece. This, compared to say
a GM automatic, makes it easy to design a PSRU around. The Jatco
has this in common with the C6.

Here is a picture of the Jatco and  C6 parts for comparison.
sorry about the quality of the pictures. As you can see
there is a wide selection of C6 parts and their derivatives.

The Borg Warner35/40 transmission I would guess is probably stronger
than the Jatco as the Falcon six is a pretty powerful car.
At least the one I drove all over Tasmania was. I liked it a lot.
Nice car. Not as powerful however as a 7 liter U.S. Ford V8
or an F250 turbo diesel pickup truck that uses later versions
of the C6.

Having said all this I want to warn you that the main issue
is the torque pulse amplitude out of the engine and not so much the HP.
If you are thinking about scaling down the PSRU because you
are using only one rotor I would advise caution. The torque
pulse is the same amplitude. Just half as often. It also goes
negative unlike a two rotor engine.

Paul Lamar

Thanks Paul,
Lust curious about the possibility for use with other motors, it does look
very small !

Question - with the last photo and which I hadn't noticed before - one
planetary set has a splined Annular and the other has a splined planetary
housing. I'm confused on which one is for what application, in relation to
ratios for our use - I thought they were all the same.
Are all the six pinion the same, or are they the same as the 4 pioion in
this photo.

Can you please clear this up for me before I place my order.

I'd prefer to run the prop clockwise (viewing from cockpit) and would
therefore prefer the 2.85 ratio configeration. I suppose if we have a fixed
Annular we don't want it splined and if we are driving from the housing we
want it splined.
Is this correct ?

Question - what sort of RPM and HP do you envisage for take-off and cruise
(estimate only) using the 2.85 ratio (understanding the effect the prop
diameter has on the outcome).
George (down under)

I can't say about the six pinion as the only one I have seen so far
is with out splines. The one Tracy uses in his redrive.

The 2.85 version takes power from the planet carrier. The ring gear
is fixed to the PSRU housing.

If you run the engine at 7500 with a fair street side port over 200 is probably
possible. A good peripheral port at 7500 should be good for up to around 
300 HP at 7500 RPM.  Here is the HP chart of the Leman P-port engine.
dive the HP numbers by two for a two rotor.

Paul Lamar
 
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