I would look at the MT 643 or the newer MD3060 transmissions for
the first gear planetary. The Allison 1000 is the transmission used
in GM 3/4and 1 ton trucks..Lots of parts and the price may be good
but the MT643 or MD3060 will give 3.5:1 ratio. That would allow
10,000RPM and close to 3,000RPM at the prop. Get full use out of
building a different PERU.
Dale Davies
Are you sure about that ratio. Can you get the dimensions of the
ring and sun gears?
I have decided to build our own planet carrier out of 7075T6 and
add two pinions. Six total up from four. 50% more torque
capabilities.
Thje parts are low cost.
Paul Lamar
Paul, Would be great if you could get a serious racer with your
air-frame of choice and interested in the Turbo 20B on board for
the project........
Do you think the Reno establishment would change the rules to
sandbag the Rotary if the piston guys felt threatened
??........(Like the road racers did)............<:)
Kelly Troyer
The trick is don't win all the time :-)
Paul Lamar
Yes Paul. I found the ratios listed on an Allison web site in the
specs section. There is even one with a 4.5:1 give or take ratio if
someone wanted to use a wide cord low RPM prop for low noise. I will
see what I can find out about planetary dimensions.
Dale Davies
Not the same as the ratios of the individual planet sets. Those
are the ratios of concern for a truck engineer or customer.
There is no real reason to publish the ratios of the individuate planet sets
under specific configurations..
The same planet set can have different ratios depending on which devices
are fed power, which are held fixed and which extract power.
The ratios published are a combinations of the three different planetary's
working together.
Here is some info on that.
Paul Lamar
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