Today's Message Index:
----------------------
1. 09:33 AM - Cowl Install (Phil Kelsey)
2. 09:11 PM - Re: Cowl Install (Gary L Vogt)
Message 1
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Gary, finally working on installing the new cowling on my Grumman. Some
questions
- Do you put the plexiglass cover over the landing light as it is
on the original cowl, or do you leave it off?
- On the powerflow exhaust do you align the muffler with the
longitudinal axis or angle it slightly outboard?
- Do you cut the cowling in such a way as to be able to remove the
right hand side of the bottom cowling without removing the muffler? I
assume that to do that you fabricate a plate to close the slot and maintain
integrity of the cowl.
Phil Kelsey
ReliantAir
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of Gary Vogt
Sent: Thursday, October 06, 2011 13:45
Subject: Re: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic
cover for it?
Hi Pete,
I've made 3 different fairings that fit behind the short 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 some trial and error on the
mounting to get the least drag.
My 77 Cheetah would true out at about 140 knots. That's running over
redline. McCauley prop. Stock exhaust. It was light too. One radio. One
GPS. No VOR. But, even with ported and polished cylinders and the HC mod,
a loaded Tiger would out climb it.
Lots of drag. I buried the comm antennas, got rid of the VOR antennas and
steps.
I restored 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 at
2800 RPM with the steps and VOR antennas.
Gary
_____
From: Pete Kuhns <pkuhns@gmail.com>
Sent: Thursday, October 6, 2011 7:32 AM
Subject: TeamGrumman-List: 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
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Message 2
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| Subject: | Re: Cowl Install |
1. The plexiglass goes between landing light housing and the cowling.
2. Good question. Actually, it needs to go just slightly in. Normally, I m
ake it parallel to the longitudinal axis as a rule.
3. Cut the opening to the end of the ramp. You don't need to fill the openi
ng. The airflow is out of the cowling. If it were an issue, I'd make you f
ill the hole behind the nose strut.
You can add another nut plate if you like to attach the open ends to the fir
ewall.
Did you see the template I sent out for the cutout?
Gary
Sent from my iPad
On Oct 17, 2011, at 9:30 AM, "Phil Kelsey" <Phil@ReliantAir.com> wrote:
> Gary, finally working on installing the new cowling on my Grumman. Some q
uestions
>
>
>
> - Do you put the plexiglass cover over the landing light as it is
on the original cowl, or do you leave it off?
>
> - On the powerflow exhaust do you align the muffler with the long
itudinal axis or angle it slightly outboard?
>
> - Do you cut the cowling in such a way as to be able to remove th
e right hand side of the bottom cowling without removing the muffler? I ass
ume that to do that you fabricate a plate to close the slot and maintain int
egrity of the cowl.
>
>
>
> Phil Kelsey
>
> ReliantAir
>
>
>
> From: owner-teamgrumman-list-server@matronics.com [mailto:owner-teamgrumma
n-list-server@matronics.com] On Behalf Of Gary Vogt
> Sent: Thursday, October 06, 2011 13:45
> To: teamgrumman-list@matronics.com
> Subject: Re: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic
cover for it?
>
>
>
> Hi Pete,
>
>
>
> I've made 3 different fairings that fit behind the short stack. The short
one worked the best. Plus, it fits up snug behind the pipe so it closes th
e 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 some trial and error on the moun
ting to get the least drag.
>
>
>
> My 77 Cheetah would true out at about 140 knots. That's running over redl
ine. McCauley prop. Stock exhaust. It was light too. One radio. One GPS
. No VOR. But, even with ported and polished cylinders and the HC mod, a l
oaded Tiger would out climb it.
>
>
>
> Lots of drag. I buried the comm antennas, got rid of the VOR antennas and
steps.
>
>
>
> I restored 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 at
2800 RPM with the steps and VOR antennas.
>
>
>
> Gary
>
>
>
> From: Pete Kuhns <pkuhns@gmail.com>
> To: teamgrumman-list@matronics.com
> Sent: Thursday, October 6, 2011 7:32 AM
> Subject: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic cov
er for it?
>
>
>
> Hi Gary: My plane has the short stack Powerflow exhaust. I think it's kind
a draggy up there and was wondering if you ever made some covering for it th
at 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 reduci
ng parasitic drag. Thank you!
>
>
> -- Pete Kuhns
> N27161, '79 Cheetah
> GEZ, Shelbyville, IN
>
>
>
>
>
>
>
>
>
>
> ======
> Email scanned by PC Tools - No viruses or spyware found.
> (Email Guard: 7.0.0.26, Virus/Spyware Database: 6.18280)
> http://www.pctools.com
> ======
>
>
>
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