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O.K., time to throw a little F matter into the
fan. I am sitting in my new shop, with a Lancair Legacy RG, and a
relatively new 20B "D" series on a palette. I got the engine complete
with everything it had in the Cosmo that it came out of. There isn't
even a coat of grease on this thing. Radiator, oil cooler, air
conditioner, condenser, ECU, injectors, coils, motor mounts, and about 100
pounds of extra stuff came with it. My buddy (he has been selling
engines for 15 years) in LA that sold me this engine ($4500.00) is in constant
contact with people who race this motor, and I am getting a lot of input on
how to set this thing up. I have ordered Tracy's gear drive, and plan on
generating 400 HP on take -off, and about 75-80% at cruise. My max rpm
will be 8000. You have no idea how much input I am getting from the
racing set. They are saying that with a variable boost (electronic)
controller, I can vary the boost at any given altitude, as much or as little
as I want, and tweak this thing for max performance. They can't believe
that I am asking so little from this engine.
This will get us started;
Greg
----- Original Message -----
Sent: Sunday, February 10, 2008 7:14
PM
Subject: [FlyRotary] Re: Fuel
burn
Yeah, I would be interested in this one too, as I am
looking at prop options too.
Greg
(Lancair, on the ground, in the new shop, mating with
a 20B as of this weekend....(:-)
----- Original Message -----
Sent: Sunday, February 10, 2008 4:06
PM
Subject: [FlyRotary] Re: Fuel
burn
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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