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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