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tiger862(at)ligtel.com
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 Posted: Mon Sep 18, 2006 8:39 am Post subject: lower cowling |
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Is there anyway to repair cracks in a lower cowling on a 1978 Tiger, besides putting patches on the outside?
[quote][b]
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flyv35b(at)minetfiber.com
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| Posted: Mon Sep 18, 2006 9:28 am Post subject: lower cowling |
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Yes, put the patch on the INSIDE and flush rivet it. The patch and cowl skin can usually be dimpled to accept the flush rivet. Use AN426-3 rivets typically.
Cliff A&P/IA
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Mon Sep 18, 2006 11:20 am Post subject: lower cowling |
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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.
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Gary
AuCountry Aviation
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az_gila
Joined: 17 Jun 2006
Posts: 99
Location: Tucson, AZ
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| Posted: Mon Sep 18, 2006 9:19 pm Post subject: lower cowling |
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At 12:19 PM 9/18/2006, you wrote:
| Quote: | --> TeamGrumman-List message posted by: teamgrumman(at)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
[quote]-----Original Message-----
From: tiger862(at)ligtel.com
To: teamgrumman-list(at)matronics.com
Sent: Mon, 18 Sep 2006 9:37 AM
Subject: lower cowling
Is there anyway to repair cracks in a lower cowling on a 1978 Tiger, besides putting patches on the outside?[b]
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flyv35b(at)minetfiber.com
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| Posted: Tue Sep 19, 2006 6:03 am Post subject: lower cowling |
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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
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Tue Sep 19, 2006 10:28 am Post subject: lower cowling |
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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
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Gary
AuCountry Aviation
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