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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Sat Oct 07, 2006 10:52 pm Post subject: Here's one for the experts |
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I'm doing an annual on a 79 Tiger with 1800 TTSN.
Background:
(1) The plane had several bird strikes a few years ago. Wings were
repaired. From what I can tell, the wings were NOT removed for the
repair.
(2) It has electic trim.
(3) No other damage to the plane.
What I found:
When I got the plane, I noticed that the electric trim was at or near
it's left wing DOWN limit. The fixed right aileron trim tab was still
installed. The right trim tab had been bent for a right wing UP
condition.
What I did:
(1) Rigged both the ailerons and flaps to within 1/2 degree balanced
left to right.
(2) The aileron cables were tensioned to 30 to 32 lbs.
(3) The elevator (even though that doesn't affect roll) cables were set
to 35 lbs tension.
(4) The bolts on the elevator were crowded out so there was a 1/2 inch
play between the left and right elevator halves.
- - holes drilled oversize and larger bolts installed. Both
elevator halves exactly match the horizontal.
(5) No damage to the forward horizontal attachments.
(6) Rudder is centered
(7) I removed the fixed right aileron trim tab.
Test flight after annual:
(1) With the electric trim set to neutral, the plane flew with an
extremely heavy right wing.
(2) The roll can be corrected with the electric trim set to full left
DOWN wing.
(3) The yaw induced required more right rudder than I expected.
(4) landed
Next Step:
(1) drained all the fuel from the right wing, filled the left wing to
the tabs.
(2) I measured the surfaces of the wings for angle of attack and they
are pretty even side to side.
(3) Inspected the entire aircraft to see if I could find ANYTHING that
would cause a heavy right wing.
- - - I could find Nothing out of the ordinary.
Test flew the plane:
(1) The plane still flies with a VERY heavy right wing.
(2) landed
Next Step:
(1) Rigged the right flap down 2 degrees to increase lift on right side.
Test flew the plane:
(1) The plane still flies with heavy right wing.
(2) landed
Re-installed the fixed right aileron trim tab. I'll fly it again
tomorrow.
QUESTION: What could make the right wing so heavy?
- - - - The only thing I can difinitively see that is non-original is
the electric aileron trim.
________________________________________________________________________
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_________________
Gary
AuCountry Aviation
Home of Team Grumman |
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jetinc(at)comcast.net
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| Posted: Fri Oct 13, 2006 8:07 pm Post subject: Here's one for the experts |
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Hi Gary,
I didn't see this last night when I when I checked e-mails. We've been trying to fix this since the first time you worked on the plane and before the bird strike...2002 or 2003. I'm certain this isn't related to the bird strike. I'd love to fix it but don't have any suggestions. Let's keep talking about this and try a few more things like changing the aileron...I wanna get this sorted out.
Thanks,
Eddie
[quote]-------------- Original message --------------
From: teamgrumman(at)aol.com
[quote] --> TeamGrumman-List message posted by: teamgrumman(at)aol.com
I'm doing an annual on a 79 Tiger with 1800 TTSN.
Background:
(1) The plane had several bird strikes a few years ago. Wings were
repaired. From what I can tell, the wings were NOT removed for the
repair.
(2) It has electic trim.
(3) No other damage to the plane.
What I found:
When I got the plane, I noticed that the electric trim was at or near
it's left wing DOWN limit. The fixed right aileron trim tab was still
installed. The right trim tab had been bent for a right wing UP
condition.
What I did:
(1) Rigged both the ailerons and flaps to within 1/2 degree balanced
left to rig ht.
(2) The aileron cables were tensioned to 30 to 32 lbs.
(3) The elevator (even though that doesn't affect roll) cables were set
to 35 lbs tension.
(4) The bolts on the elevator were crowded out so there was a 1/2 inch
play between the left and right elevator halves.
- - holes drilled oversize and larger bolts installed. Both
elevator halves exactly match the horizontal.
(5) No damage to the forward horizontal attachments.
(6) Rudder is centered
(7) I removed the fixed right aileron trim tab.
Test flight after annual:
(1) With the electric trim set to neutral, the plane flew with an
extremely heavy right wing.
(2) The roll can be corrected with the electric trim set to full left
DOWN wing.
(3) The yaw induced required more right rudder than I expected.
(4) landed
Next Step:
(1) drained al l the fuel from the right wing, filled the left wing to
the tabs.
(2) I measured the surfaces of the wings for angle of attack and they
are pretty even side to side.
(3) Inspected the entire aircraft to see if I could find ANYTHING that
would cause a heavy right wing.
- - - I could find Nothing out of the ordinary.
Test flew the plane:
(1) The plane still flies with a VERY heavy right wing.
(2) landed
Next Step:
(1) Rigged the right flap down 2 degrees to increase lift on right side.
Test flew the plane:
(1) The plane still flies with heavy right wing.
(2) landed
Re-installed the fixed right aileron trim tab. I'll fly it again
tomorrow.
QUESTION: What could make the right wing so heavy?
- - - - The only thing I can difinitively see that is non-original is
the e lectri
&
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?TeamGrumman-List |
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