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  #1  
Old 10-12-2017, 11:19 PM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
Posts: 31
Default The resurrection of RV-7 #100 "Well c**p that's bent" edition.

While sorting through all the various bits and pieces of RV-7 #100 Empennage I've found one item so far that looks damaged, either from it's 16 years in hibernation, or the "love and care" of UPS.

So.... First problem. What to do about this?

The VS-808PP Vertical Spar Plate has a pronounced curve in it as seen below.



The options I'm thinking about are.....

1) Try and straighten it out and hope I don't make things worse.

2) Cleco it "as is" and drive the rivets home. It'll be fine!

3) Bite the bullet early and order a new one.

Seeing as I purchased a second hand kit at considerable savings I've budgeted a certain amount of overhead in dollars for situations like this, but the more of that budget I can hold on to.....
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  #2  
Old 10-12-2017, 11:47 PM
fcordrey fcordrey is offline
 
Join Date: Jun 2014
Location: Aulander,NC
Posts: 9
Default

Straighten it out. Put it on your work bench and flex it till it is straight. They are all bowed like that from being stamped out. It'll be fine.
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  #3  
Old 10-13-2017, 12:12 AM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
Posts: 31
Default

Quote:
Originally Posted by fcordrey View Post
Straighten it out. Put it on your work bench and flex it till it is straight. They are all bowed like that from being stamped out. It'll be fine.
Awesome and thanks!
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Orphaned -7 empennage kit purchased! 9/15/2017
2017 Donation paid...
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  #4  
Old 10-13-2017, 06:50 AM
Reflex Reflex is offline
 
Join Date: Jan 2015
Location: Baldwin City, Kansas
Posts: 67
Default

I think most of us had the same issue. I posted this very question a little over a year ago. The responses were excellent with one suggesting that I put it over my knee and slowly work it out.

It's not really my style to make anything that easy , but I tried it. Fifteen minutes later it was straight.

Best of Luck,

Fred
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  #5  
Old 10-13-2017, 08:06 AM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 389
Default Yup

Quote:
Originally Posted by Reflex View Post
I think most of us had the same issue. I posted this very question a little over a year ago. The responses were excellent with one suggesting that I put it over my knee and slowly work it out.

It's not really my style to make anything that easy , but I tried it. Fifteen minutes later it was straight.

Best of Luck,

Fred
Mine came curved way worse than in the OP's photo. I had an old tire laying around at this point in my build. Used it as a sort of a form to straighten the part out. Worked great.
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Last edited by Dan Langhout : 10-13-2017 at 09:20 AM.
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  #6  
Old 10-13-2017, 08:39 AM
A-Ron A-Ron is offline
 
Join Date: Jul 2014
Location: Trinidad, CA
Posts: 15
Default

I am surprised that no one referenced the construction manual as this is specifically referenced in section 5.13.1.
The above responses are all not the best method and will not do as good a job as the example in the manual. Here is the text; the manual has a picture (figure) that helps illustrate the procedure.

5.13.1 STRAIGHTENING THICK ALUMINUM PARTS
NOTE: Some thick (.125 [3.2 mm] or thicker) aluminum parts, such as the
(F-01411C Horizontal Stabilizer Attachment Bars in the RV-14) may be
bowed due to the punching operation used during their manufacture.
Use the following process to straighten any other thick aluminum
part prior to installation.
Clamp one end of the part in a padded vice
(padded with wood, aluminum, etc).
Pre-load the free end of the attachment bar in
the direction required to straighten it. Using a
rubber mallet, firmly strike the part once near
the vice.
Slide the part further into the vice, pre-load,
and strike the bar again.
Repeat as necessary until the part is straight
within 1/16 [1.6 mm] along its entire length.
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Last edited by A-Ron : 10-13-2017 at 09:34 AM. Reason: To make the response less confrontational
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  #7  
Old 10-13-2017, 11:24 AM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,182
Default

RTFM
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  #8  
Old 10-13-2017, 11:49 AM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 858
Default

That's the low-drag "speed curve", just make sure it bends in the direction of airflow.

Kidding.

Totally normal.

Even if you don't straighten it stand-alone, the spar flanges and skin holes will pull it back straight.
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  #9  
Old 10-14-2017, 01:38 AM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
Posts: 31
Default

Quote:
Originally Posted by sblack View Post
RTFM
Okay.... I earned that one!
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Orphaned -7 empennage kit purchased! 9/15/2017
2017 Donation paid...
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  #10  
Old 10-16-2017, 05:55 AM
Erimo's Avatar
Erimo Erimo is offline
 
Join Date: Jul 2015
Location: Marcoussis, France
Posts: 17
Default Straightening alum parts.

Hi Ryan,

If it can help you, see below the Van's advises to straighten aluminium bended parts.

https://onedrive.live.com/?cid=0634E...%21106&o=OneUp

Eric

RV14A
Empennage, wings and fuse done.
F-PJEM reserved
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