Ed Anderson wrote:

Paul,
    Did not get into the air today to test the new intake as a few odds and
ends got in the way.  Hope to fly it tomorrow.

   However, you may want to pass a bit of information on to those who are
installing  Rotaries and into to have vacuum gyros.  I had designed a belt
driven attachment to drive a standard aircraft vacuum pump.  While it
worked, the wide range of the rotary's engine speed had it not pulling
enough vacuum any time the engine was below 3500-4000 and the higher speeds
soon caused the pump to wear and fail.  I went through two in less than a
year.

   I had the idea early on to use the 13B airpump be abandon the idea
because of its weight.  Well, I went back to idea and install a airpump and
connected its intake to my vacuum system.  Boy! 4.5" of vacuum at 2000 rpm
and no worry about graphite powder all over the cowling.  These things tend
to last a long time and seldom fail catastrophically as an aircraft vacuum
pump will.  I expect long usage and wear would be indicated by a low drop in
the vacuum generated.

Best Regards

Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews NC
eanderson@carolina.rr.com

Not to mention they are free at your local junkyard.
 
Paul Lamar
 
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