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  #141  
Old 06-16-2018, 02:24 AM
RV7ForMe RV7ForMe is offline
 
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Quote:
Originally Posted by jcarne View Post
I sure like the look of green as well, just not the maroon that comes before it
SO true !!!
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  #142  
Old 06-16-2018, 11:22 PM
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jcarne jcarne is offline
 
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Location: Worland, Wyoming
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Well it was time to bend the longerons finally. I didn't find them that easy or difficult, just time consuming and tedious. The first shallow bend took me 3 hours and a few choice words, the next one was half of that!

First I put the shallow bends in the longerons, the picture below shows both longerons clamped together after the bend. The trickiest part of almost anything to do with the longerons is that when you bend it one way it usually bends in an undesirable way too (which must be corrected).

20180615_182052 by Jereme Carne, on Flickr

Next the aft canopy deck goes on and gets drilled to the longerons. The front of the top flange lines up with the 28.25" mark. You also use some scrap 0.032" to simulate the side skins as the canopy deck sits on top.

20180615_183554 by Jereme Carne, on Flickr

All drilled and matches up nicely. I would also add that before you drill the canopy deck that you debur the outside edge as it sits on top of the side skin and deburing after may ruin this fit to a very small degree.

20180616_175849 by Jereme Carne, on Flickr

Next was on to the downward bend. A little math will make life easy! I found it difficult to reliably measure the deflection as things move as you whack it. Therefore, with a little bit of math I found that 5.5 degrees of deflection over 28.25" will yield pretty dang close to the 2.75" the plans call for. After the bend I held it up to the forward side skins and it matches it almost exactly! Looks like I don't have to embarrass myself after all with my math, especially since I'm a math teacher. (ugh, after looking at the plans again it has this angle on it! haha they call for 5.6 degrees, live and learn)

20180616_205721 by Jereme Carne, on Flickr

Measurement on top where there is no bend.

20180616_205547 by Jereme Carne, on Flickr

Measurement of the forward bend deflection.

20180616_205557 by Jereme Carne, on Flickr

This is what I used to clamp the longerons into place, worked really well!

20180616_205746 by Jereme Carne, on Flickr

Next was onto the twist. First I measured where there is no twist.

20180616_210410 by Jereme Carne, on Flickr

After applying the twist you get your 17 degrees. You have to really get after it to make this twist!!! The aluminum really springs back a lot.

20180616_210444 by Jereme Carne, on Flickr
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Last edited by jcarne : 06-16-2018 at 11:33 PM.
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  #143  
Old 06-16-2018, 11:27 PM
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jcarne jcarne is offline
 
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In these two pics you can see how close everything came out with respect to each other.

20180616_211336 by Jereme Carne, on Flickr

20180616_211346 by Jereme Carne, on Flickr

I couldn't help myself and put the longerons roughly what I thought they would be in the airplane. (albeit upside down)

20180616_211501 by Jereme Carne, on Flickr
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  #144  
Old 06-17-2018, 07:24 AM
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kentlik kentlik is offline
 
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Nice! I have heard tell these can be a pain, what was your experience?
Mine was bent a little at the rear left side and built a jig to straighten it.

Solve for "X"...always loved math, not too adept, but loved the easier stuff like this. I also like watching your progress!
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  #145  
Old 06-17-2018, 08:34 AM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by kentlik View Post
Nice! I have heard tell these can be a pain, what was your experience?
Mine was bent a little at the rear left side and built a jig to straighten it.

Solve for "X"...always loved math, not too adept, but loved the easier stuff like this. I also like watching your progress!
I'm glad you enjoy the updates Kent, I really like yours as well, perhaps one day when our planes are done we will have to meet in the middle.

I found the longerons to be a pretty large pain in the neck. Trying to bend the first one really had me upset at one point because the tape protecting the longerons kept getting jacked up in the Buller dies. (and fixing the verticle bend was a pain too) The downward bend was a pain since I couldn't figure out how to keep it from walking in the vice (until I used metal strips). Lastly, I don't know how anyone gets through bending these without some sort of nick in the longerons. I'm pretty OCD about nicks in my parts so removing them with scotchbrite was just icing on the cake.

All in all if I could do it again I would probably get it done in half the time and be more relaxed about it. It was also more enjoyable than fuel tanks and tank ribs so I guess there is something positive.
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  #146  
Old 06-17-2018, 02:20 PM
RV7ForMe RV7ForMe is offline
 
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Default Longerons

The Longerons are one of the task I have been thinking about being very difficult to get right. I have them hidden in my shop for now while I build the wings. Thanks for the step by step pictures. looks like you are producing really nice work!
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  #147  
Old 06-17-2018, 10:16 PM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by RV7ForMe View Post
The Longerons are one of the task I have been thinking about being very difficult to get right. I have them hidden in my shop for now while I build the wings. Thanks for the step by step pictures. looks like you are producing really nice work!
Thanks for the complements! The longerons you will find to merely be tedious and frustrating at times but certainly not the hardest part of the build. Then when you are done with them guys things will start to take shape!
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Finish kit on order
Exempt but gladly paying!
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  #148  
Old 06-17-2018, 10:37 PM
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jcarne jcarne is offline
 
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Oh snap, look who made some progress today! I may need to finally move them wings off to the side of my garage, things are starting to get cramped.

20180617_160156 by Jereme Carne, on Flickr

For those of you about to this part of the build, know this... The F-779 skin will try and beat you, you mustn't give up the fight!

20180617_132512 by Jereme Carne, on Flickr
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RV-7A Emp. done
Wings mostly done
Working on Fuselage
Finish kit on order
Exempt but gladly paying!
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  #149  
Old 06-19-2018, 07:28 AM
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kentlik kentlik is offline
 
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Cramped?! LOL. That looks pretty sweet! I am sure your project will progress rapidly from here on out, the results are so rewarding in magnitude so to speak.
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  #150  
Old 06-21-2018, 01:31 PM
Steenos Steenos is offline
 
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Very nice project! Great progress.
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