short rivets

[Mike Davis]

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In building my SR-2500 wing, and following (I think) the directions in the
manual, I found a very disturbing thing. And it seems to me rather
dangerous!
I don't know if the Rebel uses the same design -- a "U-chanal" along the
bottom edge of the main spar in the area of the lift strut fittings and a
external doubler on the leading edge and wing skins.

After riveting the bottom tank skin, bottom wing skin and leading edge skins
to the main spar (with RR-6403 tank rivets in the tank area and RV-1410
rivets
elsewhere), as directed, I have turned the wing over. I then removed the
top
tank and top wing skins. I found a very disturbing and, I believe, a
dangerous situation. The RV-1410 in the main spar that go through the W-544
doubler, leading edge skin, wing skin, main spar flange, and the W-526 spar
chanal are far too short - not even protruding from the W-526 chanal!

Since this chanal (W-526) is in the location of the lift strut attach
fittings, which would carry a main load, I believe this to be a major
problem!
Please comment if this a known problem.

Also, I ordered and used some of the brushable pro-seal from Levens Aviation
in Toronto that was mentioned a week or so ago. While it seems too thin to
use on a verticle surface (it will tend to run), I have used it as a second
coat on all joints and really like it

Charlie Starr cws1932@aol.com



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[Mike Davis]

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Charlie, If the revits are to short, contact murphy and they will sent you
the right lengh revits . they were very helpful to me sending me more
revits
when ever i needed them
Les Vincent
SR2500
O24SR



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[Mike Davis]

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From: "Charles Skorupa" <chucks@gte.net>
To: "Murphy Rebel" <murphy-rebel@dcsol.com>
Subject: Re: short rivets
Date: Sun, 7 Jun 1998 19:29:17 -0700
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The Rebel Elite appears to be O.K. here. I just checked my Rebel Elite
wing, which has the thicker .040 leading edge skin and .040 doubler around
the access hole but does not have a "U channel" along the bottom edge of the
main spar as you described. The rivets appear to be pulled up normally, but
I haven't checked to see if the calculated thickness stack-up exceeds the
recommended grip range for the Avex rivets. Does anyone have the specs for
the Avex rivets? I think researched this once before, but put the data in a
"safe place", and it's now hiding from me. Unscientifically, I held an
un-pulled rivet against the end of the wing where the tank skin/leading edge
skin/spar flange and the rivet exceeded the stacked thickness by about 0.20.
This is slightly less than 1/2 the un-pulled length, so it looks O.K. I
guess if the thickness of the channel you are describing exceeds 0.20, then
it indeed would be too short. Keep us appraised.


- Chuck Skorupa -
rebel Elite S/N 500
-----Original Message-----
From: CWS1932@aol.com <CWS1932@aol.com>
To: murphy-rebel@dcsol.com <murphy-rebel@dcsol.com>
Cc: CWS1932@aol.com <CWS1932@aol.com>
Date: Sunday, June 07, 1998 5:31 PM
Subject: short rivets

In building my SR-2500 wing, and following (I think) the directions in the
manual, I found a very disturbing thing. And it seems to me rather

dangerous!

I don't know if the Rebel uses the same design -- a "U-chanal" along the
bottom edge of the main spar in the area of the lift strut fittings and a
external doubler on the leading edge and wing skins.

After riveting the bottom tank skin, bottom wing skin and leading edge

skins

to the main spar (with RR-6403 tank rivets in the tank area and RV-1410

rivets

elsewhere), as directed, I have turned the wing over. I then removed the

top

tank and top wing skins. I found a very disturbing and, I believe, a
dangerous situation. The RV-1410 in the main spar that go through the W-544
doubler, leading edge skin, wing skin, main spar flange, and the W-526 spar
chanal are far too short - not even protruding from the W-526 chanal!

Since this chanal (W-526) is in the location of the lift strut attach
fittings, which would carry a main load, I believe this to be a major

problem!

Please comment if this a known problem.

Also, I ordered and used some of the brushable pro-seal from Levens

Aviation

in Toronto that was mentioned a week or so ago. While it seems too thin to
use on a verticle surface (it will tend to run), I have used it as a second
coat on all joints and really like it

Charlie Starr cws1932@aol.com

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[Mike Davis]

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To: <murphy-rebel@dcsol.com> (Murphy Rebel)
From: Murphy Aircraft Tech Department <murtech@murphyair.com >
Subject: Re: short rivets
Date: Mon, 8 Jun 1998 13:10:13 -0700

At 07:29 PM 6/7/98 -0700, you wrote:

The Rebel Elite appears to be O.K. here. I just checked my Rebel Elite
wing, which has the thicker .040 leading edge skin and .040 doubler around
the access hole but does not have a "U channel" along the bottom edge of

the

main spar as you described. The rivets appear to be pulled up normally, but
I haven't checked to see if the calculated thickness stack-up exceeds the
recommended grip range for the Avex rivets. Does anyone have the specs for
the Avex rivets? I think researched this once before, but put the data in

a

"safe place", and it's now hiding from me. Unscientifically, I held an
un-pulled rivet against the end of the wing where the tank skin/leading

edge

skin/spar flange and the rivet exceeded the stacked thickness by about

0.20.

This is slightly less than 1/2 the un-pulled length, so it looks O.K. I
guess if the thickness of the channel you are describing exceeds 0.20, then
it indeed would be too short. Keep us appraised.


- Chuck Skorupa -
rebel Elite S/N 500
-----Original Message-----
From: CWS1932@aol.com <CWS1932@aol.com>
To: murphy-rebel@dcsol.com <murphy-rebel@dcsol.com>
Cc: CWS1932@aol.com <CWS1932@aol.com>
Date: Sunday, June 07, 1998 5:31 PM
Subject: short rivets

In building my SR-2500 wing, and following (I think) the directions in the
manual, I found a very disturbing thing. And it seems to me rather

dangerous!

I don't know if the Rebel uses the same design -- a "U-chanal" along the
bottom edge of the main spar in the area of the lift strut fittings and a
external doubler on the leading edge and wing skins.

After riveting the bottom tank skin, bottom wing skin and leading edge

skins

to the main spar (with RR-6403 tank rivets in the tank area and RV-1410

rivets

elsewhere), as directed, I have turned the wing over. I then removed the

top

tank and top wing skins. I found a very disturbing and, I believe, a
dangerous situation. The RV-1410 in the main spar that go through the

W-544

doubler, leading edge skin, wing skin, main spar flange, and the W-526

spar

chanal are far too short - not even protruding from the W-526 chanal!

Since this chanal (W-526) is in the location of the lift strut attach
fittings, which would carry a main load, I believe this to be a major

problem!

Please comment if this a known problem.

Also, I ordered and used some of the brushable pro-seal from Levens

Aviation

in Toronto that was mentioned a week or so ago. While it seems too thin

to

use on a verticle surface (it will tend to run), I have used it as a

second

coat on all joints and really like it

Charlie Starr cws1932@aol.com

Hi Charlie;

Your right, the rivets in that area are too short, the avex1410 rivet is
used in the majority of the structure, if it works out to be too short in
some areas use a longer rivet,should you run short of a certain rivet please
let us know and we will get you what you need .

Regards;
Dennis>
Murphy Aircraft Mfg. Ltd.
Ph: 1-604-792-5855
Fax: 1-604-792-7006
e-mail: murtech@murphyir.com
Web Site: http://www.murphyair.com




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