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Sun 100 flown at 500 ft.
Top speed on a normally aspirated aircraft is always best at sealevel. Best fuel economy is reached up high.
Tracy
On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills <rv-4mike@cox.net> wrote:
When you guys put out these numbers (RPM, speed, etc...)
would also be helpful to know at what altitude. I assume at or close to sea
level? I havent yet made any speed runs at low altitude.
Mike
Sent: Tuesday, February 09, 2010 5:27 PM
Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re:
N.A. Renesis to turbo
Tracy, if you have the data could you give us the
RPMs you saw at the 205 and 217.5 air speeds?
Dennis H.
Renesis
RV-7A
Austin, Tx.
That was 209 and
217.5
the 209 mph speed was with the 2.176 drive
turning a 68 - 71 prop with engine turning 6300 , mixture leaned to 17
gph. On other occasions I could push it to 6400 at best power mixture
burning 20 gph.
The 217.5 mph was with a 2.85 drive turning a 74 - 88
prop with engine turning 7250. I didn't get a good read on the fuel flow
but obviously it would have been higher. I remember requesting priority
landing after the race due to low fuel.
Neither run was done
at best power mixture but leaned a few gph less than
max.
Tracy
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