Date: Mon, 18 Jan 1999 09:31:38 -0800
From: Paul <rotaryeng@earthlink.net>
To: z <rotaryeng@earthlink.net>
Subject: Chain size

Wood Family wrote:

Paul,
I used 1 1/2" chain with 3/8" pitch with 8" c to c. This is the size 

chain

that was recommended for that horsepower by the charts in the Morse
catalog. I have been told that they are very conservative with their 

ratings

and the numbers are based on 10,000 hr. service life. A 1" chain would
probably work but with a shorter service life. A 1" chain and 

sprockets

would would make the whole drive a little thinner and save maybe 7 to 

9 lbs.

As it is it came in at 40 lbs.
  I would like to hear from some engineers on their opinions on what 

Hi-Vo

chain size would be adequate and safe. There is always next time.

Lonnie
rwood@iceinternet.com

I met a guy at the CAFE auto engine symposium a year or so ago.
He was a retired engineer at Chevy R&D working on transmissions.
He was the guy that designed the Chaparral's so-called auto
transmission back in the 60's. He had a Suburu powered airplane 
he was designing and building a hi-vo PSRU for. I'll have 
to dig up his phone number or email address.
He was in the bay area of CA as I recall.

One way of checking the chain is know the diameter of the pulleys
and the peak torque you can then calculate the shear loads on the
pins holding the chain together from the calculated chain tension.

Info I need:
Pulley diameter.
Pin diameter. 
Number of plates across the chain.

Paul


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