It must be now, even though no mention of it on their site. Just talked
with another builder only one serial number from my kit and he has the
sleeve also.
Scott
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of
steveh@dcsol.com
Sent: Monday, July 19, 2004 9:17 AM
To:
rebel-builders@dcsol.com
Subject: RE: Elevator trim-tab rod failure
The tube came packed in the "Ray Allen" box with the servo and indicator.
I thought that it was part of the kit! ! !
Steve H
Moose 213
On 7/18/2004 8:17 PM,
SA@MWUTAH.COM wrote to REBEL-BUILDERS:
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rebel-builders@dcsol.com>; Sun, 18 Jul 2004 22:17:34 -0600 (MDT)
-> From: "Scott Aldrich" <
sa@mwutah.com>
-> To: <
rebel-builders@dcsol.com>
-> Subject: RE: Elevator trim-tab rod failure
-> Date: Sun, 18 Jul 2004 22:17:59 -0600
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->
-> Interesting. The aluminum tube was in the servo box? I just checked the
-> Ray Allen site and there is no mention there of anything other than the
-> standard SS threaded rod.
->
-> If someone at MAM knows enough about it to put a tube in the box you'd
think
-> they would mention it to the rest of us. Maybe I just missed it on the
very
-> "up to date" tech support page...
->
-> Scott
-> Moose 174
->
-> -----Original Message-----
-> From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of
->
steveh@dcsol.com
-> Sent: Sunday, July 18, 2004 8:38 PM
-> To:
rebel-builders@dcsol.com
-> Subject: Re: Elevator trim-tab rod failure
->
-> Checked out my trim tab that we received with our Moose kit and found
that a
->
-> piece of Alu. tubing came with the kit. The tube is to slipped over the
rod
->
-> after you have adjusted the tab to the correct possision, than mark the
rod
-> and remove from one end turn buckle, insert the tube and reconnect the
turn
-> buckle to the correct possision. This will hopefully keep ti from
bending
-> in
-> the future.
->
-> Steve H
-> Moose 213
->
->
->
-> On 7/13/2004 4:32 AM,
KLEHMAN@ALBEDO.NET wrote to REBEL-BUILDERS:
->
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rebel-builders@dcsol.com; Tue, 13 Jul 2004 04:30:57
-0800
-> -> Received: from juliet.albedo.net ([206.51.22.2])
EHLO=juliet.albedo.net
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-> -> id 332935796; Tue, 13 Jul 2004 04:30:56 -0800
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-> -> permitted nor denied by domain of
->
klehman@albedo.net)
-> -> Received: from albedo.net (ppp147.albedo.net [206.51.22.147])
-> -> (authenticated bits=0)
-> -> by juliet.albedo.net (8.12.11/8.12.3) with ESMTP id i6DCUnDH010726
-> -> for <
rebel-builders@dcsol.com>; Tue, 13 Jul 2004 08:30:50 -0400
-> -> Message-ID: <
40F3D658.50000@albedo.net>
-> -> Date: Tue, 13 Jul 2004 08:32:24 -0400
-> -> From: Ken <
klehman@albedo.net>
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-> -> To:
rebel-builders@dcsol.com
-> -> Subject: Re: Elevator trim-tab rod failure
-> -> References: <002301c46856$dd624e60$6b7ba8c0@trader>
-> -> X-Orig-Content-Type: text/plain; charset=us-ascii; format=flowed
-> -> X-Orig-Content-Transfer-Encoding: 7bit
-> -> X-Virus-Scanned: clamd / ClamAV version 0.74, clamav-milter version
0.74a
-> -> on juliet
-> -> X-Virus-Status: Clean
-> ->
-> -> Hi Ted
-> ->
-> -> This is a classic "buckling mode" failure. The rod is being compressed
-> -> and it bends or buckles. So the ends are not the problem. The problem
is
-> -> that the center section of the rod needs to be thicker. You did
exactly
-> -> the right thing to slip a tube over top of the threaded rod. Gluing
that
-> -> on might be an acceptable permanent fix. For all
-> -> intents and purposes the ends are free to swivel and the center of the
-> -> rod has to be strong enough to resist buckling. The rod accepts load
-> -> until it becomes unstable and bends/buckles. Mike and you are correct
-> -> that the rod being threaded full length greatly reduces it's strength
-> -> and I would guess that a non threaded rod of the same diameter would
-> -> resist at least 3 times the load before failing in this application.
-> -> Your suggestion of threading the ends of a solid rod would also make
the
-> -> rod several times stronger for this application. Taper the diameter
down
-> -> to the threads gradually (not abruptly) if you can to reduce
multiplying
-> -> the stresses at the diameter change.
-> -> _____
-> -> \/\/\/\/\
-> -> OK !
-> -> !
-> -> _____/\/\/\/\/
-> ->
-> -> ____
-> -> \__/\/\/\/\
-> -> Best !
-> -> __ !
-> -> ____/ \/\/\/\/
-> ->
-> -> A 3/16" (0.187") solid or hollow rod will be many times stronger than
a
-> -> #8 threaded rod which is about 0.15" outer diameter but much smaller
at
-> -> the narrowest point across the bottom of the threads. And that
narrowest
-> -> point is further weakened by stress concentration due to the sudden
-> -> diameter change caused by the threads. That is why the second diagram
-> -> here is preferable as well as easier to machine..
-> ->
-> -> As an aside, this case is the same reason why a hollow push pull tube
is
-> -> almost as strong as a solid shaft. It is only the outside
-> -> diameter material that is efficiently loaded to resist bending.
-> ->
-> -> Ken
-> ->
-> -> Ted Waltman wrote:
-> ->
-> -> >Folks,
-> -> >
-> -> >My elevator trim-tab was connected to the trim servo using about a
7"
-> -> >long 8x32 threaded rod (that's 1/4" diameter for non-technical
types
-> -> >like me <grin>). I recently took a cross country where I had the
-> plane
-> -> >loaded to within 250 lbs of gross (1250 lbs of fuel, people and
-> camping
-> -> >gear). During the initial flight I found myself having to hold
-> perhaps
-> -> >10 lbs of forward pressure on the stick even with full down
elevator
-> -> >trim.
-> -> >
-> -> >Upon investigating, I found the threaded rod was bending into a
-> slight
-> -> >"U" shape. With just a little bit of pressure to bend it
straight,
-> the
-> -> >rod snapped. I'm glad this happened on the ground rather than
flying
-> or
-> -> >things would have been very interesting indeed. It's clear the
rod
-> size
-> -> >is inadequate for the elevator incidence and gross-weight flying
-> -> >characteristics of the Moose.
-> -> >
-> -> >Needing to make a field repair, I found the same size rod at a
local
-> -> >hardware store. I however, slid a thin steel tube on the outside
of
-> the
-> -> >rod to provide more strength. Thus far, after 7 hours of flight,
the
-> -> >updated rod seems to be holding well.
-> -> >
-> -> >Clearly the weak point now is where the rod attaches on each end
to
-> the
-> -> >elevator tab and the servo. I thought about getting a larger
stock
-> rod
-> -> >and having it's ends machined down to fit the existing elevator
trim
-> tab
-> -> >attach point and the servo attach point. However, this would
-> -> >essentially leave me with the same weak point as I have now with
the
-> -> >sleeve and existing rod. Without having an expensive end-to-end
-> custom
-> -> >part made, does anyone have any other idea other than leaving
things
-> as
-> -> >I've repaired them and inspecting them regularly?
-> -> >
-> -> >I'll try to remember to take a digital picture of the updated rod
-> with
-> -> >sleeve in the next day or two and post it to the site.
-> -> >
-> -> >Thanks,
-> -> >
-> -> >Ted Waltman
-> -> >Moose N142SR
-> ->
-> ->
-> ->
->
->
->
->
->
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