Hi Greg, well, if the fuel burn figure reported
was correct - then the HP figures I calculated are in the ball park.
We know the 3 rotor is capable of
producing considerably more power at sea level (per Al’s dyno run with
his 3 rotor) with the higher air density. However, at
altitude the upper limit would naturally be less due to the less dense air to
support combustion, unless you are running some sort of forced induction as in
a turbo, supercharger or perhaps nitrous oxide chemical enhancement.
But if the fuel burn was 15 gph,
then it does not matter whether it was a 2 rotor, 3 rotor or 1 rotor (a 1 rotor
would really have to be screaming to burn at that rate {:>)), the
approx HP equation is:
HP = (Gallon/Hour) *( 6 lb gasoline/gallon
) /BSFC = 15*6/0.55 = 90/0.55 = 163 HP.
Now if you choose a different BSFC such as
0.49 then you get a better conversion. But, I tend to be conservative in
my estimates.
Best Regards
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Greg Ward
Sent: Friday, January 23, 2009
12:20 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Mark's
BBQ Run / 20B numbers
Agree to that. Our projections on the turbo 20B are
much higher than that.
----- Original Message -----
Sent: Thursday, January
22, 2009 9:13 PM
Subject: [FlyRotary] Re:
Mark's BBQ Run / 20B numbers
Ed;
Seems like your numbers are about 100 hp
- or maybe one rotor – too low.
Al G
-----Original Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Thursday, January 22, 2009
8:34 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Mark's
BBQ Run / 20B numbers
Doug, at 15 gph at 6000
rpm, Mark would be making approx 165 HP, perhaps a bit more, using a very
conservative BSFC of 0.55. If you assume a bit better BSFC of 0.49
it would be around 183 HP.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of DLOMHEIM@aol.com
Sent: Thursday, January 22, 2009
9:38 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Mark's BBQ
Run / 20B numbers
Great
story...thanks for posting it! At 6,000 rpm and 15 gph, how many HP
do you think you're developing?
Also,
have you by chance flown side by side with another Lycoming powered ES for
comparison purposes? If so what did you learn?
We're
going to have a couple of "burger burns" at our airport ((2OK2)
just east of Tinker AFB) this Spring / Summer, so maybe you'll feel like going
on a short cross country up this way and show our little EAA chapter
what a three rotor looks and sounds like?!
Organizing
the hanger for Spring FWF and canopy work!
A Good Credit Score is 700 or Above. See
yours in just 2 easy steps!
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