The Murphy Builders Site

Hi Bob & Brampton area Rebelers

Great meeting yesterday with a lot of good information.

Based on our discussions, I checked my elevator trim tab. I could see no
sign at all of any flexing or fatique. The paint was perfect here as
well. It does have 3 rivets - 1 into the front tab spar & 2 into a
fore/aft rib. Still, I am going to fab up a new piece to reinforce it.

It would really be helpful for MAM to publish this stuff on their site. It
was quite a shock to find this out this weekend. I am not sure I would
have been able to handle such an ordeal re: the flutter incident! Way to
go Bob.

I feel much the same way about the spring gear i.e. their approach has been
underwhelming but do not want to criticize. I do feel I went out of my way
to submit CAD drawings of all my tank improvements - many of which are
incorporated into their present design. In return, it would have been
quite easy to supply some of the basic information. It would not do their
reputation much good to lose a builder/pilot to a flutter incident.

I also checked my elevators & found the left one to be quite tight i.e. no
lateral movement but the right one does have some (1/16" approx). Again, a
little thought would have gone a long way to resolve this design
weakness. I will address this over the winter as it is not serious but
left on its own, it will not get better no matter how much wishing I do.

If everyone works together we can make this a truly great aircraft design
with outstanding operational histories.

Just my thoughts

Brian #328R

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Brian & Guys

Just had a look at the tab & horn on our Elite and while it has the two sided
horn (two L shaped parts back to back) the only thing it ties into except the
skin is the front spar and this is by the first rivet of each of the L pieces,
the rest is just the skin, not even the rib (beside it).

I am going to have a good think about whether this is serious or not but right
now it doesn't sound good enough even compared to the (2 sided) Rebel that at
least ties into a rib on one side.

What do you Rebel & Elite guys think? Anybody see any signs of wear & tear on
your trims or was Bob's experience a rather scary fluke?

Bob, any idea what the factory Elite config is?

Cheers,

Dave R.
Elite583.cjb.net



Brian Cross wrote:

Hi Bob & Brampton area Rebelers

Great meeting yesterday with a lot of good information.

Based on our discussions, I checked my elevator trim tab. I could see no
sign at all of any flexing or fatique. The paint was perfect here as
well. It does have 3 rivets - 1 into the front tab spar & 2 into a
fore/aft rib. Still, I am going to fab up a new piece to reinforce it.

It would really be helpful for MAM to publish this stuff on their site. It
was quite a shock to find this out this weekend. I am not sure I would
have been able to handle such an ordeal re: the flutter incident! Way to
go Bob.

I feel much the same way about the spring gear i.e. their approach has been
underwhelming but do not want to criticize. I do feel I went out of my way
to submit CAD drawings of all my tank improvements - many of which are
incorporated into their present design. In return, it would have been
quite easy to supply some of the basic information. It would not do their
reputation much good to lose a builder/pilot to a flutter incident.

I also checked my elevators & found the left one to be quite tight i.e. no
lateral movement but the right one does have some (1/16" approx). Again, a
little thought would have gone a long way to resolve this design
weakness. I will address this over the winter as it is not serious but
left on its own, it will not get better no matter how much wishing I do.

If everyone works together we can make this a truly great aircraft design
with outstanding operational histories.

Just my thoughts

Brian #328R

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Hi Dave !

Can't remember what the factory Elite setup was, but the
current manual calls for 2 L-shaped horns, as you have. Given
that you already have the skin on, I would likely remove the horns,
put an .032 doubler under them, tying the leading edge "spar" to
the nearest rib. That should give some extra support to the horns,
and eliminate flex. I really like Ralph's idea of adding a partial
rib on either side to mount the horns onto, if you can get in there.
That should really secure things !

I think you would see movement of the skin, and possibly
the rivets, on a careful preflight, and that would be the warning
indication.... Apparently, I'm not the first to lose a tab horn !

....bobp

------------------------------------orig.-------------------------
At 12:04 AM 9/17/03 -0300, you wrote:

Brian & Guys

Just had a look at the tab & horn on our Elite and while it has the two sided
horn (two L shaped parts back to back) the only thing it ties into except the
skin is the front spar and this is by the first rivet of each of the L pieces,
the rest is just the skin, not even the rib (beside it).

I am going to have a good think about whether this is serious or not but right
now it doesn't sound good enough even compared to the (2 sided) Rebel that at
least ties into a rib on one side.

What do you Rebel & Elite guys think? Anybody see any signs of wear & tear on
your trims or was Bob's experience a rather scary fluke?

Bob, any idea what the factory Elite config is?

Cheers,

Dave R.
Elite583.cjb.net



Brian Cross wrote:

Hi Bob & Brampton area Rebelers

Great meeting yesterday with a lot of good information.

Based on our discussions, I checked my elevator trim tab. I could see no
sign at all of any flexing or fatique. The paint was perfect here as
well. It does have 3 rivets - 1 into the front tab spar & 2 into a
fore/aft rib. Still, I am going to fab up a new piece to reinforce it.

It would really be helpful for MAM to publish this stuff on their site. It
was quite a shock to find this out this weekend. I am not sure I would
have been able to handle such an ordeal re: the flutter incident! Way to
go Bob.

I feel much the same way about the spring gear i.e. their approach has been
underwhelming but do not want to criticize. I do feel I went out of my way
to submit CAD drawings of all my tank improvements - many of which are
incorporated into their present design. In return, it would have been
quite easy to supply some of the basic information. It would not do their
reputation much good to lose a builder/pilot to a flutter incident.

I also checked my elevators & found the left one to be quite tight i.e. no
lateral movement but the right one does have some (1/16" approx). Again, a
little thought would have gone a long way to resolve this design
weakness. I will address this over the winter as it is not serious but
left on its own, it will not get better no matter how much wishing I do.

If everyone works together we can make this a truly great aircraft design
with outstanding operational histories.

Just my thoughts

Brian #328R

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To contact the list admin, e-mail mike.davis@dcsol.com
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-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
David Ricker
Sent: Tuesday, September 16, 2003 8:05 PM
To: murphy-rebel@dcsol.com
Subject: Elevator Trim Tab Horn WAS: Re:
Sunday Meeting


Brian & Guys

Just had a look at the tab & horn on our
Elite and while it has the two sided
horn (two L shaped parts back to back) the
only thing it ties into except the
skin is the front spar and this is by the
first rivet of each of the L pieces,
the rest is just the skin, not even the rib
(beside it).

I am going to have a good think about
whether this is serious or not but right
now it doesn't sound good enough even
compared to the (2 sided) Rebel that at
least ties into a rib on one side.

What do you Rebel & Elite guys think?
Anybody see any signs of wear & tear on
your trims or was Bob's experience a rather
scary fluke?

Bob, any idea what the factory Elite config is?

Cheers,

Dave R.
Elite583.cjb.net



Brian Cross wrote:

Hi Bob & Brampton area Rebelers

Great meeting yesterday with a lot of good

information.

Based on our discussions, I checked my

elevator trim tab. I could see no

sign at all of any flexing or fatique.

The paint was perfect here as

well. It does have 3 rivets - 1 into the

front tab spar & 2 into a

fore/aft rib. Still, I am going to fab up

a new piece to reinforce it.

It would really be helpful for MAM to

publish this stuff on their site. It

was quite a shock to find this out this

weekend. I am not sure I would

have been able to handle such an ordeal

re: the flutter incident! Way to

go Bob.

I feel much the same way about the spring

gear i.e. their approach has been

underwhelming but do not want to

criticize. I do feel I went out of my way

to submit CAD drawings of all my tank

improvements - many of which are

incorporated into their present design.

In return, it would have been

quite easy to supply some of the basic

information. It would not do their

reputation much good to lose a

builder/pilot to a flutter incident.

I also checked my elevators & found the

left one to be quite tight i.e. no

lateral movement but the right one does

have some (1/16" approx). Again, a

little thought would have gone a long way

to resolve this design

weakness. I will address this over the

winter as it is not serious but

left on its own, it will not get better no

matter how much wishing I do.

If everyone works together we can make

this a truly great aircraft design

with outstanding operational histories.

Just my thoughts

Brian #328R

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