Greg
Ward wrote:
>
> O.K., time to throw a little F
matter into the fan. I am sitting in my new shop, with a Lancair Legacy
RG, and a relatively new 20B "D" series on a palette. I got the engine
complete with everything it had in the Cosmo that it came out of. There
isn't even a coat of grease on this thing. Radiator, oil cooler, air
conditioner, condenser, ECU, injectors, coils, motor mounts, and about 100
pounds of extra stuff came with it. My buddy (he has been selling engines
for 15 years) in LA that sold me this engine ($4500.00) is in constant
contact with people who race this motor, and I am getting a lot of input
on how to set this thing up. I have ordered Tracy's gear drive, and plan
on generating 400 HP on take -off, and about 75-80% at cruise. My max rpm
will be 8000. You have no idea how much input I am getting from the racing
set. They are saying that with a variable boost (electronic) controller, I
can vary the boost at any given altitude, as much or as little as I want,
and tweak this thing for max performance. They can't believe that I am
asking so little from this engine.
>
> This will
get us started;
> Greg
> Greg, I don't want to
rain on your parade, but there are three questions you have to ask
yourself:
- Can I reliably pull that many horses out of
the motor for hours on end?
- Can I carry enough fuel to support
pulling that many horses for hours on end?
- Can I keep the
engine from melting while pull that many horses out of
it?
It's been demonstrated on this list several times
that not everything from racing translates directly to airplanes. For
instance, 400Hp will require twice the radiator volume that most of us are
using, along with the larger associated ducting and cooling drag. Will the
reduction in reliability and increased fuel burn be paid for by the extra
speed once the effects of the extra weight and cooling drag are factored
in? ie, you will go faster, just not as much as "double the Hp" would
imply, because of the cooling drag. I don't think most racers have to
worry about that to much, but you could wind-up with a system that just
cost you more to go to only relatively close places
faster.
--
Homepage:
http://www.flyrotary.com/ Archive and UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html