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john.marzulli(at)gmail.co
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 Posted: Fri Feb 13, 2009 12:52 am Post subject: Options to fix horizontal stabilizers mounts too far inside? |
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I placed the horizontal stabilizer mounts 10mm to far inside on both sides. This was only for the forward mounts. The aft mounts are placed perfectly.
Two options exist in my mind for fixing this:
- Create a custom mount from the fuselage side shaped to clear the flange of the stabilizer's mount. This would require a spacer and a much longer bolt. It also increases the chance of the mount cracking.
- Open the stabilizer and move the mounts 10mm outside. This may require some work to the spar.
The first option seems the easiest, but possibly not airworthy. The second option seems the best ( and a bunch of work ), but I am worried that filling in the old holes in the spar will interfere and rub with the mount causing cracking that I could not see.
Picture: http://3.bp.blogspot.com/_mhDbWUJRTOE/SZUzRJAb9MI/AAAAAAAAGhQ/lQQAMBOosYo/s1600-h/IMG_4817.jpg
John Marzulli
http://www.GenevieveMarzulli.org/
http://marzulli.smugmug.com/
http://701Builder.blogspot.com/
http://www.JohnMarzulli.net/
[quote][b]
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Geoff Heap
Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey
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| Posted: Fri Feb 13, 2009 4:28 am Post subject: Re: Options to fix horizontal stabilizers mounts too far ins |
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Hi John. I know it's only 20mm (3/4") total but with the supports closer to center the relative airflow, gusts, maneuvers near top of maneuvering envelope would have a stronger leverage on the horizontal stab. Not much. The wider spaced mounts would be more stable.
My thoughts...Geoff
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Fri Feb 13, 2009 7:21 am Post subject: Options to fix horizontal stabilizers mounts too far inside? |
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Hate to say it John but I think you are going to be opening up your stab. As for the internal repair, might it be possible to turn the brackets around the other way and re-use the spar mounting holes? I believe the 750 has the stab mounted with the angles going inwards rather than the 701's outward brackets.
Might be worth a call to Zenith on that one
Do Not Archive
Doug MacDonald
CH-701 Scratch Builder
NW Ontario, Canada
--- On Fri, 2/13/09, John Marzulli <john.marzulli(at)gmail.com> wrote:
| Quote: | From: John Marzulli <john.marzulli(at)gmail.com>
Subject: Options to fix horizontal stabilizers mounts too far inside?
To: zenith701801-list(at)matronics.com
Date: Friday, February 13, 2009, 2:51 AM
I placed the horizontal stabilizer mounts 10mm to far inside
on both sides.
This was only for the forward mounts. The aft mounts are
placed perfectly.
|
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