Subject: Tracy PSRU weight reduction. Part weights
From: Rotary Engine
Date: 10/20/2009, 9:54 AM
To: AAA Put this in the To box



Hi Paul;

What is the weight of Tracy's damper plate without the flex/drive plate
and counterweight?
And the adapter plate and spacers?

Thanks
Cary


I don't have a weight on the damper plate here. I have one on the
hangar. If it is 10 by 10 and a .25 inch thick the just aluminum part
would weigh about  2.5 pounds.

Tracy's adapter plate weighs 7.8 pounds.

The bolts are about 3.5 inches long and 10 mm
Steel weighs .3 pounds per cubic inch.
Therefor the bolts weigh about .7 pounds each.

There are six so that is 4.2 pounds.


The blocks are 3 inches wide 1/2 inch thick and say 10 inches total
so the blocks weigh I guess about 1.5 pounds to 2 pounds.

Paul Lamar

Hi Paul,

That sound pretty high for the bolt weight.
10 mm = 0.4 in dia
Area = 3.14 x sqr(0.2) = .1256 sqr in
3.5 in x .1256 in sqr = .4396 cu in
.3 lb/in cu x .4396 in cu = 0.13 lb  for a total of 0.8 lb for 6 bolts.

Bob W.
-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/


I stand corrected. Probably an arithmetic error.
It's Robin fault as she borrowed my calculator :)

Paul Lamar

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