Way to go Dave, that's the way progress is made on this stuff.
Still can't believe you got this far on the plane during your
residency!
----- Original Message -----
Sent: Tuesday, July 19, 2005 1:36
AM
Subject: [FlyRotary] Surge, wastegate,
Evans, and Anesthesia
In my last episode, I was battling compressor surge (stall) and going to
try to put a hole in the intake system to create more flow. The
thought was that would allow me to open up the throttle more, decrease the
apparent pressure ratio to the turbo (because of reduced throttle body losses)
and allow for more flow. No good... I made a hole working up to
1/2 inch in dia which created a noticeable difference in throttle position for
a given boost but no improvement in the occurrence of surge.
Well, I finally graduated my residency last week and now will be working
much less, including 3 weeks of vacation. The first of which I spent at
the hangar. I decided to just open up the wastegate.. I removed
the flapper valve all together, opening up the waste gate significantly.
I was worried that it might be too much and I would not be getting any
boost. But with the flapper removed I still can make 40"MAP on take off,
my RPM for a given MAP is improved (probably because of decreased back
pressure) and thermal rejection may be improved as well. All in all it
was a good move because my limiting factor is still cooling.