Today's Message Index:
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1. 07:35 AM - Short-stack Powerflow exhaust - aerodynamic cover for it? (Pete Kuhns)
2. 10:47 AM - Re: Short-stack Powerflow exhaust - aerodynamic cover for it? (Gary Vogt)
Message 1
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| Subject: | Short-stack Powerflow exhaust - aerodynamic cover for |
it?
Hi Gary: My plane has the short stack Powerflow exhaust. I think it's kinda
draggy up there and was wondering if you ever made some covering for it that
reduced it's airflow 'signature' (parasitic drag). The oil vent tube also is
kinda draggy down there.
Just wondering where you found speed improvements on the Cheetah by reducing
parasitic drag. Thank you!
-- Pete Kuhns
N27161, '79 Cheetah
GEZ, Shelbyville, IN
Message 2
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| Subject: | Re: Short-stack Powerflow exhaust - aerodynamic cover |
for it?
Hi Pete,-=0A=0AI've made-3 different fairings-that fit behind the sho
rt stack. -The short one worked the best. -Plus, it fits up snug behind
the pipe so it closes the hole created when you cut out the exit ramp. -
I can have Dave make you one for $100 with shipping. -You'll need to do s
ome trial and error on the mounting to get the least drag. -=0A=0AMy 77 C
heetah would true out at about 140 knots. -That's running over redline.
-McCauley prop. -Stock exhaust. -It was light too. -One radio. -O
ne GPS. -No VOR. -But, even with ported and polished cylinders and the
HC mod, a loaded Tiger would out climb it. -=0A=0ALots of drag. -I buri
ed the comm antennas, got rid of the VOR antennas and steps. -=0A=0AI res
tored a 77 Cheetah a few years back. -He did everything to that plane.
-With a New LyCon engine and Sensenich prop, he could true at 142 knots a
t 2800 RPM with the steps and VOR antennas.=0A=0AGary=0A=0A=0A_____________
___________________=0AFrom: Pete Kuhns <pkuhns@gmail.com>=0ATo: teamgrumman
-list@matronics.com=0ASent: Thursday, October 6, 2011 7:32 AM=0ASubject: Te
amGrumman-List: Short-stack Powerflow exhaust - aerodynamic cover for it?
=0A=0A=0AHi Gary: My plane has the short stack Powerflow exhaust. I think i
t's kinda draggy up there and was wondering if you ever made some covering
for it that reduced it's airflow 'signature' (parasitic drag). The oil vent
tube also is kinda draggy down there. =0A=0AJust wondering where you found
speed improvements on the Cheetah by reducing parasitic drag. Thank you!
=0A=0A=0A-- Pete Kuhns=0AN27161, '79 Cheetah=0AGEZ, Shelbyville, IN=0A=0A
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