Today's Message Index:
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1. 06:13 AM - Re: Cowl Install (Phil Kelsey)
2. 08:35 PM - Re: Cowl Install (Gary Vogt)
Message 1
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Gary thanks for the info. I know I saw that template in my email at one
time, can't find it now. Could you resend it to me?
Phil
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of Gary L
Vogt
Sent: Monday, October 17, 2011 23:59
Subject: Re: TeamGrumman-List: 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
make 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
opening. The airflow is out of the cowling. If it were an issue, I'd make
you fill the hole behind the nose strut.
You can add another nut plate if you like to attach the open ends to the
firewall.
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
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 |
Phil,=C2-=0A=0ASure, no problem.=0A=0AHere is the template.=0A=0A=0A_____
___________________________=0AFrom: Phil Kelsey <Phil@ReliantAir.com>=0ATo:
teamgrumman-list@matronics.com=0ASent: Tuesday, October 18, 2011 6:10 AM
=0ASubject: RE: TeamGrumman-List: Cowl Install=0A=0A=0A =0AGary thanks for
the info.=C2- I know I saw that template in my=0Aemail at one time, can
=99t find it now.=C2- Could you resend it to me?=0A=C2-=0APhil=0A
=C2-=0AFrom:owner-teamgrumman-list-server@matronics.com=0A[mailto:owner-t
eamgrumman-list-server@matronics.com] On Behalf Of Gary L=0AVogt=0ASent: Mo
nday, October 17, 2011 23:59=0ATo: teamgrumman-list@matronics.com=0ASubject
: Re: TeamGrumman-List: Cowl Install=0A=C2-=0A1. =C2-The plexiglass goe
s between landing light housing=0Aand the cowling.=C2-=0A=C2-=0A2. =C2
-Good question. =C2-Actually, it needs to go just=0Aslightly in. =C2-
Normally, I make it parallel to the longitudinal axis as a=0Arule.=C2-=0A
=C2-=0A3. =C2-Cut the opening to the end of the ramp. You don't=0Aneed
to fill the opening. =C2-The airflow is out of the cowling. =C2-If it
=0Awere an issue, I'd make you fill the hole behind the nose strut.=C2-
=0A=C2-=0AYou can add another nut plate if you like to attach the open=0A
ends to the firewall.=C2-=0A=C2-=0ADid you see the template I sent=0Aou
t for the cutout?=0AGary=0ASent from my iPad=0A=0AOn Oct 17, 2011, at 9:30
AM, "Phil Kelsey" <Phil@ReliantAir.com> wrote:=0AGary,=0Afinally working on
installing the new cowling on my Grumman.=C2- Some=0Aquestions=0A>=C2-
=0A>-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2- Do you put the
plexiglass cover over the landing light as it is=0Aon the original cowl, or
do you leave it off?=0A>-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-
=C2- On the powerflow exhaust do you align the muffler with the=0Alongitu
dinal axis or angle it slightly outboard?=0A>-=C2-=C2-=C2-=C2-=C2
-=C2-=C2-=C2-=C2- Do you cut the cowling in such a way as to be a
ble to remove the=0Aright hand side of the bottom cowling without removing
the muffler?=C2- I=0Aassume that to do that you fabricate a plate to clos
e the slot and maintain=0Aintegrity of the cowl.=0A>=C2-=0A>Phil=0AKelsey
=0A>ReliantAir=0A>=C2-=0A>From:owner-teamgrumman-list-server@matronics.co
m [mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of Gary=0A
Vogt=0A>Sent: Thursday, October 06, 2011 13:45=0A>To: teamgrumman-list@matr
onics.com=0A>Subject: Re: TeamGrumman-List: Short-stack Powerflow exhaust -
=0Aaerodynamic cover for it?=0A>=C2-=0A>Hi=0APete,=C2-=0A>=C2-=0A>I'v
e=0Amade=C2-3 different fairings=C2-that fit behind the short stack.
=C2-The=0Ashort one worked the best. =C2-Plus, it fits up snug behind t
he pipe so it=0Acloses the hole created when you cut out the exit ramp. =C2
-I can have Dave=0Amake you one for $100 with shipping. =C2-You'll need
to do some trial and=0Aerror on the mounting to get the least drag. =C2-
=0A>=C2-=0A>My=0A77 Cheetah would true out at about 140 knots. =C2-That
's running over=0Aredline. =C2-McCauley prop. =C2-Stock exhaust. =C2-
It was light too.=0A=C2-One radio. =C2-One GPS. =C2-No VOR. =C2-But
, even with ported and=0Apolished cylinders and the HC mod, a loaded Tiger
would out climb it. =C2-=0A>=C2-=0A>Lots=0Aof drag. =C2-I buried the
comm antennas, got rid of the VOR antennas and=0Asteps. =C2-=0A>=C2-=0A
>I=0Arestored a 77 Cheetah a few years back. =C2-He did everything to tha
t plane.=0A=C2-With a New LyCon engine and Sensenich prop, he could true
at 142 knots at=0A2800 RPM with the steps and VOR antennas.=0A>=C2-=0A>Ga
ry=0A>=C2-=0A>=0A>________________________________=0A> =0A>From:Pete Kuhn
s <pkuhns@gmail.com>=0A>To: teamgrumman-list@matronics.com=0A>Sent: Thursda
y, October 6, 2011 7:32 AM=0A>Subject: TeamGrumman-List: Short-stack Powerf
low exhaust - aerodynamic=0Acover for it?=0A>=0A>=0A>=0A>=0A>Hi Gary: My pl
ane has the short=0Astack Powerflow exhaust. I think it's kinda draggy up t
here and was wondering=0Aif you ever made some covering for it that reduced
it's airflow 'signature'=0A(parasitic drag). The oil vent tube also is kin
da draggy down there. =0A>=0A>Just wondering where you found speed improvem
ents on the Cheetah by reducing=0Aparasitic drag. Thank you! =0A>=0A>=0A>--
Pete Kuhns=0A>N27161, '79 Cheetah=0A>GEZ, Shelbyville, IN=0A>=0A>=0A>=0A>
=0A>=C2-=0A>=0A>=0A>=0A>=0A>=0A>========0A>Email scanned by
PC Tools - No viruses or spyware found.=0A>(Email Guard: 7.0.0.26, Virus/S
pyware Database: 6.18280)=0A>http://www.pctools.com=0A>======
= =0A>=C2-=0A>=C2-=0A>=C2-=0A=C2-=0A=C2-=0Ahttp://www.matronics
.com/Navigator?TeamGrumman-List=0Ahttp://forums.matronics.com=0Ahttp://www.
matronics.com/contribution=0A=C2-=0A=0A=0A=0A=0A=0A=======
=0AEmail scanned by PC Tools - No viruses or spyware found.=0A(Email Guard:
7.0.0.26, Virus/Spyware Database: 6.18530)=0Ahttp://www.pctools.com=0A=
=========================0A
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