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Charlie,
Not sure about that. However, the controller range starts at 1700rpm and goes up to 2700rpm. So, I assume it is designed to operate as low as that. With a 2.85 gearbox, I don't ever run up in the high end of the prop rpm range. Too bad the 2.17 box turns backwards.
Mark
On Feb 10, 2008 6:06 PM, Charlie England < ceengland@bellsouth.net> wrote:
Hi Mark,
Isn't 7000/2.85=2456.14 ??
Is the M/T optimized (diameter, pitch, twist) for turning only 2150rpm?
Charlie
Mark Steitle wrote:
Al,
Yes, I'm running one of Tracy's 2.85:1.00 boxes.
Mark
On Feb 10, 2008 12:20 PM, Al Gietzen < ALVentures@cox.net>
wrote:
Subject: [FlyRotary]
Re: Fuel burn
Thanks, good data Al. I'm sure that some of
the
differences we're seeing are due to altitude. So far, I've stayed
fairly
low (3000-5000'). I may try some higher altitude flight soon just to
see
how it changes my performance numbers. Another difference is that I
have
a M/T electric constant speed prop. I normally set it to 2150rpm for
takeoff. This allows the engine to turn around 7000 rpm, which will
account some for the higher fuel burn I'm seeing. My airport is at
520'
msl, so there's a 1000' difference there from your 1500' msl airport.
Yes, she really accelerates down the runway. I'm usually airborne
in about 900-1000'.
Mark
I'm not
sure I see how these correlate "set
it to 2150rpm for takeoff. This allows the engine to turn around 7000
rpm,"; but the big difference is
that you're putting out more horses than I am. At 7000 you're
likely looking at about 300 hp, so 25-26 gph would be expected. Are
you
running a 2.85 ratio redrive; or something else?
Al
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