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teamgrumman(at)yahoo.com
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 Posted: Sat Mar 26, 2011 7:53 pm Post subject: elevator trim arms |
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Installed a set of elevator trim arms yesterday.
Don't know if ya'all recall me saying something before. So, here I am ag'in.
The trim arms, to begin with, need to have .143 inch holes in them instead of the .125 holes. All of the early Grummans (Pre-2004) have the larger holes. Not a big deal, really. Except that the material is really hard and it chews up drill bits.
Second, the angles are not quite the same as the early ones. This puts the arm on a different plane (geometric plane) than the original ones. Plus, the portion with the rivet holes is a bit too long and it hits the pivot tab. The tab needs to be trimmed down to keep the arm from hitting it.
Pics included.
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flyv35b(at)minetfiber.com
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| Posted: Sun Mar 27, 2011 7:41 am Post subject: elevator trim arms |
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Gary's talking about the 3 rivet holes. I don't know what the drawing
spec for the holes is but .143" would be the size for an oversize #4
Cherry-Max rivet. Many times when a .125" hole is used initially and a
CM rivet is removed the hole gets elongated or over-sized if you are not
really careful. That is the reason for the oversize CM rivet as the
hole can be re-sized and a tight fitting rivet installed.
I agree that it would probably be better to have the holes in the
replacement arms drilled for the oversize rivets, but maybe Fletchair is
just following the original drawing specs (your comment Garner).
Who knows why the angle variation. May be due to spring back of the
metal when it was bent or some other reason. That shouldn't be hard to
deal with.
Cliff
On 3/26/2011 8:50 PM, Gary Vogt wrote:
| Quote: | Installed a set of elevator trim arms yesterday.
Don't know if ya'all recall me saying something before. So, here I am
ag'in.
The trim arms, to begin with, need to have .143 inch holes in them
instead of the .125 holes. All of the early Grummans (Pre-2004) have the
larger holes. Not a big deal, really. Except that the material is really
hard and it chews up drill bits.
Second, the angles are not quite the same as the early ones. This puts
the arm on a different plane (geometric plane) than the original ones.
Plus, the portion with the rivet holes is a bit too long and it hits the
pivot tab. The tab needs to be trimmed down to keep the arm from hitting it.
Pics included.
|
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teamgrumman(at)yahoo.com
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| Posted: Sun Mar 27, 2011 10:58 am Post subject: elevator trim arms |
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I'm not sure why the holes are the oversize holes. All I know is that ALL of the ones I've replaced already had the larger holes.
It isn't just the bend angle. The lengths to the bends are wrong also. They don't have the same Form, Fit, and Function as the original arms.
From: flyv35b <flyv35b(at)minetfiber.com>
To: teamgrumman-list(at)matronics.com
Sent: Sun, March 27, 2011 8:18:29 AM
Subject: Re: elevator trim arms
--> TeamGrumman-List message posted by: flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)>
Gary's talking about the 3 rivet holes. I don't know what the drawing spec for the holes is but .143" would be the size for an oversize #4 Cherry-Max rivet. Many times when a .125" hole is used initially and a CM rivet is removed the hole gets elongated or over-sized if you are not really careful. That is the reason for the oversize CM rivet as the hole can be re-sized and a tight fitting rivet installed.
I agree that it would probably be better to have the holes in the replacement arms drilled for the oversize rivets, but maybe Fletchair is just following the original drawing specs (your comment Garner).
Who knows why the angle variation. May be due to spring back of the metal when it was bent or some other reason. That shouldn't be hard to deal with.
Cliff
On 3/26/2011 8:50 PM, Gary Vogt wrote:
| Quote: | Installed a set of elevator trim arms yesterday.
Don't know if ya'all recall me saying something before. So, here I am
ag'in.
The trim arms, to begin with, need to have .143 inch holes in them
instead of the .125 holes. All of the early Grummans (Pre-2004) have the
larger holes. Not a big deal, really. Except that the material is really
hard and it chews up drill bits.
Second, the angles are not quite the same as the early ones. This puts
the arm on a different plane (geometric plane) than the original ones.
Plus, the portion with the rivet holes is a bit too long and it hits the
pivot tab. The tab needs to be trimmed down to keep the arm from hitting it.
Pics included.
|
[quote][b]
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