Robert M. Gary wrote:
Dave Butler wrote in message ...

I now have the Aero-Advantage STCed dual-rotor vacuum pump and think it is
overall the best solution. It offers more redundancy and more reliable backup
for a reasonable price. http://www.aeroadvantage.com

Including installation it will be less than your electric AI, and a better
solution, IMO.


I'm not so worried about losing the vac. What I'm worried about is
lossing the AI.

BTW: What is the purpose of the dual rotor pump. When my pumps have
gone out its always been because a vain got stuck and sheared off the
pump shaft. My mechanic said that's how they usually fail. Wouldn't
that kill both rotors?
-Robert

I understand your skepticism, but AeroAdvantage claims that they have a
mechanical arrangement that allows each rotor to fail independently. Check the
web site for more details, but if my memory serves it amounts to providing weak
points (necking) in the shaft in such a way that the shaft for each rotor can
fail independently. I have had trouble visualizing what the mechanical
arrangement is and would like to take one apart or see an exploded drawing to
see how they do that. I can't explain exactly how it's done, but they convinced
me to my satisfaction that they had solved the problem.

Dave
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