Today's Message Index:
----------------------
1. 08:46 AM - Re: Jamie (James Courtney)
2. 08:27 PM - SAIB CE-04-34 (cracks) (TeamGrumman@aol.com)
3. 08:31 PM - SAIB CE-04-34 (cracks) (TeamGrumman@aol.com)
4. 09:48 PM - WHEEL BEARINGS (TeamGrumman@aol.com)
5. 10:23 PM - Re: Sealants for Tigers (James Courtney)
6. 10:29 PM - Re: WHEEL BEARINGS (Steven Jackson)
Message 1
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--> TeamGrumman-List message posted by: "James Courtney" <jamey@jamescourtney.net>
N72T Jamey?
That'd be me...
-----Original Message-----
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of
TeamGrumman@aol.com
Subject: TeamGrumman-List: Jamie
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
Jamie, I lost your email. Send me an email and I'll forward a picture.
Gary
advertising on the Matronics Forums.
Message 2
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| Subject: | SAIB CE-04-34 (cracks) |
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
Well, I'm here in the Grumman Gang to post what I've learned about the
cracks in the lower stiffener at locations #6 and #7.=A0
First, let me preference this with a caveat:=A0 Years ago, when I first started
looking at Grummans on a daily basis, I paid particular attention to
locations #1, 2, 3, 4, and 8.=A0 I did so because this area always seemed (to me)
like
an area that didn't have enough meat and I always expected to find something,
anything, wrong.=A0 I never did.=A0
When the SAIB came out, again, I looked very closely at this area.=A0 The next
4 planes came out clean as far as I could tell.=A0 Then, today, while annualing
a Tiger with 2700 hours on it, I felt what I thought was a rough edge where=20I
expected smooth.=A0 I had to remove a strobe power supply to gain access to=20both
sides; so I could both reach it and see it clearly.=A0 Sure enough, cracks in
the lower stiffener at #6 and #7.=A0
I took some pictures and, along with the SAIB (with it's pictures) sent it to
a friend of mine that teaches structures at UNLV.=A0 It took a few calls back
and forth, asking and answering questions, to come up with a cause and a
possible path to a solution.=A0
First of all, the entire empennage twisting motion caused by the horizontal
is being transmitted to the aft bulkhead and to the vertical supports (spar
support angles) bonded to the fuselage skin.=A0 Those two spar supports then
transmit the twist to locations, #6 and #7, bonded joints with sharp intersecting
corners (causing a stress riser).=A0 The bonded joints between the spar supports
and the lower stiffener is all there is to stop twisting motion on the last=202
feet or so of empennage.=A0
From what I've learned, had the spar supports and lower stiffener been made
more like the bulkhead just ahead of it, plus having a top cross support (upper
stiffener?), the twisting motion would have had little or no effect on those
joints.=A0 ALSO, and this is important, the joints should have been radiused (in
the inside corners) and bonded across a larger area.=A0
In the pictures of the SAIB, you can see how the bulkhead just ahead of the
horizontal support is also riveted to the tray to which the ELT tray mounts,
#5.=A0
The description I was given to visualize this goes something like this.=A0 Take
a square Tupperware container, hold the bottom in one hand and twist the top
with the other.=A0 The resulting motion of the open end will give you a pretty
good idea what loads and stresses the bonded joints and stiffeners are
experiencing.=A0
Now, lets find a DER that is willing to engineer a permanent fix and not just
replace the parts.
Gary
Message 3
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| Subject: | SAIB CE-04-34 (cracks) |
Garner_Rice@fletchair.com, sandbag23@hotmail.com, vi_bui@pacbell.net,
kfinley@ve1.com, n6dg@san.rr.com
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
I was trying to post to the Grumman Gang also but got bumped. Oh well, such
is life.
Gary
www.AuCountry.com
Home of Team Grumman
Message 4
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--> TeamGrumman-List message posted by: TeamGrumman@aol.com
38854 Lower Fork Stem (Leaf Models) Indian Chief Motorcycle: bearing Timken
08125/08231
So, the bearings used on the nose wheel is from a 1929 Indian motorcycle.
Interestingly, the Indian also uses a Marvel/Schebler carburetor.
Message 5
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| Subject: | RE: Sealants for Tigers |
--> TeamGrumman-List message posted by: "James Courtney" <jamey@jamescourtney.net>
The stuff used for tank sealing is similar or the same as the stuff used for
wing to rib bonding?
Also interesting: http://www.sacskyranch.com/faq_sealants/FAQ00005.htm
http://www.sacskyranch.com/faq_sealants/
Thanks!
Jamey
AA5B N72T @ KSQL
-----Original Message-----
From: flyv35b [mailto:flyv35b@ashcreekwireless.com]
Subject: Re: Sealants for Tigers
> Can somebody tell me if the PR 1422 / 2 is the same or similar to the
> CS 3204A2 We have some minor delamination and the CS product seems not
> to be available here.
>
I believe you have it right. CS3204 is the tank and structural sealant. A2
is the thinner viscosity with 2 hr working time. It will run off a vertical
surface. In fuel tanks the B2 is usually used as it will stay put on a
vertical surface. The A2 might be better for getting into small areas when
repairing delamination and the excess could be squeezed out of the space
between the skin, etc. easier with clamps and rivets. It is also brushable.
Cliff A&P/IA
Message 6
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--> TeamGrumman-List message posted by: "Steven Jackson" <steven.jackson14@adelphia.net>
That means that our planes will be considered collectors items in about,
what, 40 more years or so?
-----Original Message-----
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com]On Behalf Of
TeamGrumman@aol.com
Subject: TeamGrumman-List: WHEEL BEARINGS
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
38854 Lower Fork Stem (Leaf Models) Indian Chief Motorcycle: bearing Timken
08125/08231
So, the bearings used on the nose wheel is from a 1929 Indian motorcycle.
Interestingly, the Indian also uses a Marvel/Schebler carburetor.
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