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Message
Ok, got out today and fired up the
engine with the new prop and gear box. This is the 76x88 inch prop that is
2" longer than the one Tracy and Rusty have on their birds. The static was
5400 rpm at 28.75" with ambient manifold pressure reading 29.75" (as best I
interpolated). OAT was 87F. Idle was considerably smoother whether
due to increased mass of larger prop, new gear box or both. I did notice
the 2.85 has considerably less gear lash than the 2.17.
Hi
Ed,
Glad you got
it running, and thanks for the numbers. It still bugs me that I'm only
getting 27" MAP, but I'm convinced it's a bum reading. Hard to say how
much the extra 2" of prop will effect the rpm, but that sounds a little lower
than I was expecting to hear. As you my recall, I went from 5250
with the B drive, to 5500 with the C. However, now that I've re-worked the
restrictive inlet, I'm at 6000 rpm. I bet you still have some
tweaking to do, but that's half the fun right :-)
So ya got
some P factor eh? Try it without the training wheel, in
a 3pt stance :-) Still running the left offset in the
mount?
Rusty (not
looking like I'll get to fly the -3 this weekend, due to lack of oil pressure
fitting)
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