Subject: gearbox
From: rotaryeng
Date: 1/28/2014, 10:12 PM
To: AAA-rotaryeng


Hi Paul,

Could you tell me what model Ford truck that gear set you brought me is
out of ? I thought that if I could find out what it is I might be able
to find the part that engages with those outer teeth on the planet
carrier I could take the prop drive off of that. It would leave the
planet set untouched for future inspection/removal/replacement, what do
you think ?

Chris.

Part #78 in the Slauson catalog.

I would not do it because it greatly complicates the gear box housing.
It also adds several pounds of weight to the housing not to mention the
part is itself quite heavy. I don't have one so I can not say what the
part weighs but I'll bet it is several pounds..

What do you have against doing it with the hollow dowel trick.
It is the low cost way of doing it.

Paul Lamar.

True, Paul, I was just getting my head around all the possible
iterations, is all.
   Chris.

Paul,
          I assume that we are making the 3.17 ratio  box rather than the
2.85??    Neil.


Yes Might as well as the stock RX8 engine is redlined at 8500 RPM.
Power will never be a problem :)
Max RPM with the right pitch, diameter and runner length will be around 7000 RPM.
Lower static RPM. MY guess is 6500 or so.

If you use a lower RPM you can use a larger diameter prop for better low
speed thrust and quicker hot high take offs and a higher climb rate.

Paul Lamar

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