Wrathall Mark wrote:

What is the status on the Racing Beat three rotor Monster?

I was down there a couple of weeks ago and one engine had spit out
an apex seal spring and scratched up a housing. Jim felt it was
a quality control problem. The springs are special high temp
steel obtainable in Japan. The engine did not quit. It was just down
on power. Total running time then was about 50 hours.
I don't know what alloy they make these seal spring from
but it has been suggested on here that they be made from Inconel.
Paul Lamar

Inconel X-750 is good to about 1000 deg F.  Elgiloy is good for another
couple hundred degrees or so. (To maintain spring temper)  I would not be
too surprised if he needed these materials.

Jeff Spitzer

If anybody has some old apex seal springs lying around from a late model 
turbo engine please drop them in the mail and send them to me.
I will place them in my lab quality high temp oven and progressively
raise the temperature up to 1500 F and measure the stiffness until the temper
goes away. That way we can determine whether its worth while to have
some made from Elgiloy.

Paul Lamar
 
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