Today's Message Index:
----------------------
1. 07:03 AM - Re: lower cowling (flyv35b)
2. 08:15 AM - PowerFLow (923te)
3. 11:28 AM - Re: lower cowling (teamgrumman@AOL.COM)
4. 03:40 PM - Re: PowerFLow (FLYaDIVE@AOL.COM)
Message 1
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| Subject: | Re: lower cowling |
Gary's right about the 78/79 models cracking. But maybe it is due to
the cowling flexing more due to the hole being cutout for the exhaust
tailpipe rather than the exhaust pulses. Whatever it is the stresses
are more concentrated at the front corner of the air outlet "box" than
they are with the fiberglass outlets used on the earlier models. And
maybe just patching the hole with an aluminum or composite filler patch
(with the PF internal design) will stiffen the cowl and make it better.
The PF might be better (who knows) but it does require cutting out quite
a bit of material from the outlet duct for the tailpipe and this could
change things as well. You could always install Gary's outlet ducts.
It's not that big a deal to make a nice looking patch with flush rivets.
Most repairs I have seen have be lazy with AN470 rivets in a haphazard
pattern, or worse, pop or avex rivets.
Cliff
----- Original Message -----
From: Gil Alexander
To: teamgrumman-list@matronics.com
Sent: Monday, September 18, 2006 10:18 PM
Subject: Re: TeamGrumman-List: lower cowling
At 12:19 PM 9/18/2006, you wrote:
--> TeamGrumman-List message posted by: teamgrumman@aol.com
Unfortunately, no. You're stuck with a patch. All 78 and 79 Tiger
cowlings will crack on the lower right side in the cooling exit ramp
area. The metal cooling exit ramps do not absorb enough of the
vibrations from the prop-exhaust pulses. The only way I know of to
recuce or eliminate future cracks is to replace the metal ramp with a
fiberglass ramp.
Gary... is the damage less with a PowerFlow exhaust??
The pulses should not be hitting the cowling...
gil A
-----Original Message-----
From: tiger862@ligtel.com
To: teamgrumman-list@matronics.com
Sent: Mon, 18 Sep 2006 9:37 AM
Subject: TeamGrumman-List: lower cowling
Is there anyway to repair cracks in a lower cowling on a 1978
Tiger, besides putting patches on the outside?
Message 2
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Since Powerflow has been brought up again I thought I would comment.
I am quite curious how PowerFlow got thru the STC process seeemingly so
easily....
Compared to what trouble the FAA is giving Gary with a far better cowl
than available anywhere for our grummans.
I guess once you have worked with the FAA for several years and acheived
several STC's they cut you some slack
I am suspicious that the short stack approval process did not check out
a lot of things....like the effects to air flow and cooling by
interrupting the exit ramp flow or the additional heat gain inside the
cowl which I think has shortened a few owners battery life.
Things I wish were addressed now that I bought into the short stack.
Just venting and hoping Gary's cowl gets approved soon...hang in there
Gary and don't let those FAA weenies stop you.
Regards,
Ned
Message 3
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| Subject: | Re: lower cowling |
--> TeamGrumman-List message posted by: teamgrumman@aol.com
Well, now, that is a great question. I guess once the planes have been
is service with repairs AND a short stack powerflow for a long enough
time to see if the repairs crack.
Gary
-----Original Message-----
From: gilalex@earthlink.net
Sent: Mon, 18 Sep 2006 10:18 PM
Subject: Re: TeamGrumman-List: lower cowling
Gary... is the damage less with a PowerFlow exhaust??
The pulses should not be hitting the cowling...
gil A
-----Original Message-----
From: tiger862@ligtel.com
To: teamgrumman-list@matronics.com
Sent: Mon, 18 Sep 2006 9:37 AM
Subject: TeamGrumman-List: lower cowling
Is there anyway to repair cracks in a lower cowling on a 1978
Tiger, besides putting patches on the outside?
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Message 4
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--> TeamGrumman-List message posted by: FLYaDIVE@aol.com
In a message dated 9/19/06 11:17:25 AM Eastern Daylight Time, 923te@cox.net
writes:
> Since Powerflow has been brought up again I thought I would comment.
>
> I am quite curious how PowerFlow got thru the STC process seeemingly so
> easily....
>
> Compared to what trouble the FAA is giving Gary with a far better cowl
than
> available anywhere for our grummans.
>
> I guess once you have worked with the FAA for several years and acheived
> several STC's they cut you some slack
>
> I am suspicious that the short stack approval process did not check out a
> lot of things....like the effects to air flow and cooling by interrupting
the
> exit ramp flow or the additional heat gain inside the cowl which I think
has
> shortened a few owners battery life.
>
> Things I wish were addressed now that I bought into the short stack.
>
> Just venting and hoping Gary's cowl gets approved soon...hang in there
Gary
> and don't let those FAA weenies stop you.
>
> Regards,
> Ned
==============================
"Green Paper makes for a Slippery Runway"
Barry
"Chop'd Liver"
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