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I hear you Ed. 15 psi is the size spring that
came with the waste gate, so that's where we start. I have an 11, 9, and 7
pound spring, and we will be testing the whole range to get the optimum
settings, on the dyno. Main thing dictating max boost/horsepower, will be
Tracy's redrive, so our goal is 450 hp at take-off, with a little in reserve
just in case the trees are taller than we thought.......(:-) And now you
understand why we went with the belly scoop that I sent in pictures of a couple
of weeks ago. It's almost identical to the P-51 configuration, and as I
said, hopefully we'll use some of that heat you talk about to create some
thrust. The whole object was to get all radiators and coolers out of the
cowling. Only thing we're still working on is the oil cooler exhaust,
which goes straight out of the bottom of the scoop. We are trying to
decide whether or not to put a cowl flap on that ala' P-51. We have a
variable opening one on the radiator side, so that's good, as well as allowing
for refab if we need a bigger radiator, after testing.
The beat goes on.....
Greg
Lancair 20B in progress.....
----- Original Message -----
Sent: Friday, January 23, 2009 12:10
PM
Subject: [FlyRotary] Re: HP was : Mark's
BBQ Run / 20B numbers
Should be a fire
belching dragon of an engine at over 15psi, Greg.
15 Psi boost
would be roughly 60” Hg of boost which at an A/F ratio of 12 (assume you would
run it a bit rich at those boost levels) would give at 6000 rpm approx 550 HP
burning 51 gph (more power at high rpm and boost naturally) and
producing a total of 25000 BTU/Min of heat to be dumped through the
radiator and oil cooler. Boy, you will produce more heat energy that
gets dumped through your oil cooler (8484 BTU/Min) than my total (coolant and
oil heat) entire engine puts out. Hope you have big radiators and oil
cooler {:>).
A couple of guys in
South
Carolina had a turbo 3 rotor that they stated produced
over 500 HP on the dyno. It flew, but unfortunately only one flight,
before one of the partners decided they were not true experimenters and they
decided to sell the project. It was really a nice looking set up on a
Lancair ES.
Ed
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Greg Ward
Sent: Friday, January 23, 2009 10:53
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: HP was : Mark's
BBQ Run / 20B numbers
We are running a 4088 Garrett hair dryer, starting at
about 15# of boost, and are extensively flow testing both the exhaust and
induction for best efficiency/output. That's why the pictures, show
everything a little bit different from what everyone else has done.
Trying for optimum runner length, as little back pressure as possible, early
heat removal, etc. Haven't got any real numbers down yet, until we
(finally) get on the dyno but based on what a stock 360hp Cosmo gets for
mileage, and going from there, we are convinced that fuel flows should be
pretty good. That's why they call it
"experimental".....(:-)
----- Original Message -----
Sent: Friday,
January 23, 2009 5:42 AM
Subject:
[FlyRotary] HP was : Mark's BBQ Run / 20B
numbers
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
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