I am thinking about building a Reno Racer.
We need about 800 to 1000 HP to blow the rest
of those guys into the weeds :-)

First hurdle is coming up with a gear box.
I can't afford $35.000 for a bell final drive
so I investigated the Allison 1000 truck transmission.

Rumour had it it was 4:1 but that is not the case for
a single planetary set. P3 on the Allison is 3:1 when
you hold the ring gear fixed, take power out of the
planet carrier and put power into the sun gear.
The output will rotate in the same direction as the
engine.

You get the ratio by dividing the ring gear diameter
by the sun gear diameter and adding one.

Here is a picture compared to the Ford unit we are
using now for most rotary powered air planes.

Looks good for a 1000 HP 3 rotor engine.

A lot of the stuff attached to the ring gear will be
machined away.

Paul Lamar



Paul,
Very interesting.........What airframe are you considering ?.........Of course you will want to "P" portthe 20B............Randy Kempf reports he is close to finishing the first "Beta" versions of his "P" portmethod on my 13BREW housings......Any idea at this point weight of an Allison 1000 based redrive ?  Kelly Troyer

GlasAir retract. We can move the firewall back 10" giving plenty
of room for the cooling system.

I talked to Kyle Mohan today about his 3 rotor making 800 to 950 HP
with side ports no less. Running on gasoline. The turbo charger is smaller
than the time to climb turbo. A Turbonetics GTX 750.
He has 20 races on the engine so far with out rebuilding it.

Paul Lamar

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