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  #1  
Old 08-14-2018, 07:50 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 289
Default -7 Horizontal Stabilizer Mounting

Note: -7 quick build fuselage, Synergy Air mentored stabilizer.

Today I trial fitted the horizontal stabilizer to the fuselage and something is very wrong

I started by drawing a centerline on the aft deck and then marking the F-710C spacer / F-710B angle on the top of the deck for reference.

As soon as I placed the stabilizer in position I could see the forward spar was way to far aft. 29/64" too far. That's over 7/16" of an inch too far aft.

I measured all the bits on the aft deck and they seem to be in all the correct places.

The horizontal stabilizer is more troubling. The forward spar seems to be too far aft. Neither Van's or I can figure out what mistake would end up with a misplaced spar...everything looks good compared to the plans except the spar is too far aft



There must be a mistake somewhere but darned if I can see where it is. We even entertained the idea that the stabilizer is not a -7...not sure how to tell.

Has anyone ever heard of such a thing??
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018

Last edited by mfleming : 08-14-2018 at 11:14 PM.
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  #2  
Old 08-14-2018, 08:06 PM
TX7A TX7A is offline
 
Join Date: Feb 2005
Location: Abilene, TX
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Have you fitted or installed the F-710 bulkhead yet?
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Sam Evans
RV7-A O-360 C/S
VAF#812
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  #3  
Old 08-14-2018, 08:40 PM
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Mark H Mark H is offline
 
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Location: Indianapolis, IN, USA
Posts: 51
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Being almost 1/2 out of alignment is a lot. Can you share some pictures and details of the rear spar and of the F-711 bulkhead assembly?
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Indianapolis, IN
RV-7A N896PS
Flying
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  #4  
Old 08-14-2018, 09:57 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 289
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Quote:
Originally Posted by TX7A View Post
Have you fitted or installed the F-710 bulkhead yet?
Yes the F-711 bulkhead is already installed...it's a QB fuse. And I already installed the F-712 bulkhead...it's a -7 so the tail wheel weldment is now in.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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  #5  
Old 08-14-2018, 09:58 PM
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mfleming mfleming is offline
 
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Location: Joseph, Oregon
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Quote:
Originally Posted by Mark H View Post
Being almost 1/2 out of alignment is a lot. Can you share some pictures and details of the rear spar and of the F-711 bulkhead assembly?
I'll gets some photos posted soon.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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  #6  
Old 08-14-2018, 10:08 PM
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wjb wjb is offline
 
Join Date: Nov 2012
Location: Half Moon Bay, CA
Posts: 793
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Excellent application of "measure twice, drill once (or zero)"

I'm interested in what's not happy; mine lined up quite nicely when I drilled the tail (though, I measured about 10,000 times to be sure....). Mine is a slow build.
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Bill Bencze
N430WB (reserved) RV-7 #74152, tip-up. Working the baffles
Log at: http://rv7.wbencze.com
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  #7  
Old 08-14-2018, 10:34 PM
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sahrens sahrens is offline
 
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Location: Northern CA
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Default Maybe a stupid question

When you mounted the horizontal stabilizer was the aft spar behind F-711C bars? I could see the forward spar sitting too far forward if the aft spar was in front of the F-711C bars. That flange would account for most of the space.

Check to make sure the F-711C bars are installed on the forward side of the F-712 bulkhead? Not likely to be the problem.

Your line appears to be in the correct location, based on the photo.
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RV-7 N818BG (flying)
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  #8  
Old 08-14-2018, 10:43 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
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More photos:

Here's another angle with the stabilizer in position and sitting short of the line.



--------------------------------------------------------------------------------------

Looking at the aft deck...All measurements look good here.



--------------------------------------------------------------------------------------

F-711 bulkhead from the outside.



------------------------------------------------------------------------------------

F-711 bulkhead from the inside...alls good as as I can tell.



------------------------------------------------------------------------------------

The rear stabilizer spar.

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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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  #9  
Old 08-14-2018, 10:46 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 289
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Quote:
Originally Posted by sahrens View Post
When you mounted the horizontal stabilizer was the aft spar behind F-711C bars? I could see the forward spar sitting too far forward if the aft spar was in front of the F-711C bars. That flange would account for most of the space.

Check to make sure the F-711C bars are installed on the forward side of the F-712 bulkhead? Not likely to be the problem.

Your line appears to be in the correct location, based on the photo.
Yes on both accounts.

I'm totally perplexed and am expecting to have a head slapper when the answer arrises
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018

Last edited by mfleming : 08-14-2018 at 10:57 PM.
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  #10  
Old 08-15-2018, 07:19 AM
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Arie Arie is offline
 
Join Date: Jul 2010
Location: Dubai
Posts: 125
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Check that the distance from the front of the HS rear spar to the back of the HS front spar is 12 and 3/16 inch. If it is then your HS is correct. I think check this first, and then double check that you have actually drawn those lines in the correct place. On mine the distance from your front line ( forward part of the angle (F710B) on the F710 bulkhead) to the centre of the first rivet on the aft deck in front of your line is 5/8 inch, measured parallel to the F710B angle.
Hope it all makes sense, and helps
Regards
Arie

Last edited by Arie : 08-15-2018 at 08:46 AM. Reason: Measurements added
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