----- Original Message -----
Sent: Thursday, September 25, 2003 9:13
AM
Subject: [FlyRotary] Re: DIE the short
Answer
<... Hey, hey,
Jim. Watch who's work you are calling an "remarkably extended brain
fart.."{:>) ....>
The
brain fart I was referring to was my tongue-in-cheek notion of variable
length runners would fix our life and make 200 kts effortless. It
suddenly (with my assistance too) took on a life of it's own. Sort of
a "brain fart blossom".
<... vibration of large amplitude
produced by a relatively small vibration near the same
...>
I was using
the term loosly. EDDIE does have some attributes of resonance, notably
resonant frequency.
Well, if you are
refering to RPM then I will go along with that. But, not resonance in
the "pump" sense where energy is pumped into a wave because the
frequency of the wave is at the resonance frequency of a tube. etc.
Varying boost and perhaps intercooler
efficiency might go a long way toward stabilizing intake temps (and might
qualitatively influence your secret ingredient). Absent that, how much
decrease in RPM does a 50F drop in intake temp require? A CS prop
would achieve that at WOT and would go a long way toward compensating for
temp variations due to boost.
<... review it
at SERFI next weekend ...> What and where is SERFI next weekend
?
SERFI = South East Region Fly in
at Evergreen, Al (KGZH) EAA chapter spounsered first weekend in
October. They have created an "Auto Conversion" award to be
awarded this year. I contributed a few suggestions as a criteria as
did Richard Shone? and perhaps some others on the list. Heres
the URL if you want more info:
know impact EDDIE are Intake Temp, Runner
Length, RPM and your secret ingredient (let's call it "Pixie Dust" at least
until it's better defined at Shady Bend. Runner Length seems, at this
juncture, to be the toughest one to adjust real time (even though one might
construct "summer" and "winter" intakes (sort of like sneakers and boots :o)
and swap them at Sun-Fun and Shady Bend times :o) If the rpm and air
temp variations are manageable, we might come up with an engine performance
computer that knows Runner Length and outputs EDDIE Intake Temp for current
rpm and EDDIE rpm for current Intake Temp. A display like that could
keep us adjusting rpm and boost and intercooler doors to where we'd be
assured that we're flying at the best possible speed when we run into the
Moony or mountain we didn't see with our head up our "engine
monitor".
Nice idea, maybe Tracy would
incorporate it into his EM2 {:>)
Where else could we have this much fun ...
ONLY in America !! .... Jim S.
And it's free! Well, for us
anyhow, since Marv pays for the server {:>)
Ed