Subject: Bell 47 PSRU
From: Rotary Engine
Date: 3/15/2006, 6:28 PM
To: AAme


Paul,


I noticed the Reno Racer drawings on the ACRE website listed the Bell
final
drive as having 3.1:1 ratio. Perfect.

I am trying to contact the different sources you provided to get an price
on
them.  I would appreciate it if you knew what a ball park figure would be.
I
still have to find a way to mount a C/S prop to it and supply oil through
the shaft. It appears the Reno Racer had those types of props.

Cheers


Doug Fir

Be aware there is a lot of adapting to do. I have no idea on the pricing
of the parts. Yes they are constant speed props but are were locked into
pitch position. They did not function as constant speed props.
They functioned as fixed pitch props.

Paul Lamar ...No rotor no motor.


Doug,
I would hazard a guess and say the Bell final drive looks similar in size to
the Mistral planetary.
I would be very interested to know what the price was as well.
I contacted someone here in Australia and they wanted to know WHICH final
drive I was enquiring about - that's as far as I got! So I assume from this
there is more than one model.
George ( down under)



Oh no the Bell 47 is a LOT BIGGER. Bell engineers figured 1000 HP at
6,000 RPM input.

Paul Lamar ...No rotor no motor.

  Bigger may not always be better, has anyone considered surface
speed on the large gears???
  Ken

The Bell engineers must have known about that.
--
Paul Lamar ...No rotor no motor.

   But what continuous rpm are they running them at and what is the
horse power loss is there slinging them bigger gears and pushing the
oil through them, as an eyeball engineers point of view it just looks
like a concern and at some point big is going to be to big for our
use and where is that point.
  Ken

I did not notice anything when I was running it up at Sun & Fun
at 45 inches of mercury. The 350 HP turbo charged 12A was blowing the
trees down. Sure was strong. It is probably a more efficient box
than average as it is precision made. Note the pitch on that prop.

Paul Lamar ...No rotor no motor.

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