"Brian D. Cain" wrote:
If I had a picture of the turbocharger, I could tell you
whether or not
it
truly will produce 400hp.
B
"Brian D. Cain" wrote:
Looks like some sort of Garrett T04E model with a fairly large turbine
housing. They may be able to get 400bhp out of it but that's
pushing it;
we're talking 15psi or above of boost pressure to achieve that
at very high
RPM's (7000rpm+). I take it this magical horsepower figure is only
worthwhile for taking off? Why so much power needed?
B
snips.
Thanks for the report Dave. BTW do you have a knock sensor?
Here is a real simple one to make. It uses a cheap Radio Shack single
chip audio amp and a plug in ear piece. Or you could feed the audio
into your intercom. I know you have seen this before but here it is
again for the new people.
I have some more info on BSFC verses leaning so it would be nice if we
can figure out how to lean the turbo to the EGT 200 degree F lean
of peak range. Will upload that shortly. You want to sneak up on
this at low boost settings.
BTW Brian, have you done any work on leaning the turbo engine fuel injection
map at low boost settings? Say for cruising down the highway?
Paul Lamar
Here is what I am babbling about. The BSFC curve at the bottom of the
chart is the same as the MPG curve because speed is proportional to HP.
Yes of course you can always improve the MPG by slowing down to the aircraft
drag bucket speed. The bottom line is a series of curves for each different
type of airplane showing MPG as a function of speed. The higher the MPG for
a given speed the more efficient the engine and the airplane. If we
can figure out how to run the turbo engine 200 degrees F on the lean side
of peak the TIT will drop (of course) making the turbo last longer and the
overall MPG of the airplane better as a function of speed.
The prop efficiency also enters in to these calculations and that is why
Tom Parkes needs cuffs on his IVO prop. My 182 gets 12 MPG at 150 MPH
and Tom's much slicker 3 rotor turbo Lancair ES in theory should be much
better than 12 MPG at 200 MPH. Both airplanes BTW have about the same payload.
Paul Lamar
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2004 All world wide rights reserved.
