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  #1  
Old 03-10-2015, 11:15 AM
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Default F-706, F-707, F-708

These bulkhead halves are very flimsy and not flat. Should the flange be fluted somehow to correct?
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  #2  
Old 03-10-2015, 11:47 AM
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Default

I fluted the flanges to flatten the flimsy fragments, but finally folded.

Things don't stiffen up until the aft section is riveted together. Once it's all in assembly it gets pretty rigid. Monocoque construction for real!
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  #3  
Old 03-10-2015, 12:29 PM
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Default Fluting

Quote:
Originally Posted by DaleB View Post
I fluted the flanges to flatten the flimsy fragments, but finally folded.

Things don't stiffen up until the aft section is riveted together. Once it's all in assembly it gets pretty rigid. Monocoque construction for real!
Folded? Been there. Flap spars.
Sounds like I'm OCD again.
Are you saying it goes together ok without being fluted perfectly?
After some head scratching, it looks like the flutes have to be "outies" to get the web flat. Skin would not fit.
Does that sound right?
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.

Last edited by wirejock : 03-10-2015 at 12:40 PM. Reason: add text
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  #4  
Old 03-10-2015, 12:58 PM
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Default Just get it close for now

Just get things close for now. Once you start putting the skins on the structure, you'll do the final fluting to get everything lined up and laying flat.

David
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  #5  
Old 03-10-2015, 01:18 PM
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RV7A Flyer RV7A Flyer is offline
 
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Default

Remember not to make the flange 90 degrees to the web, but something more than that to make them match the angle of the skins (since they're a sort of "cone" in shape).
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  #6  
Old 03-10-2015, 01:32 PM
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Quote:
Originally Posted by RV7A Flyer View Post
Remember not to make the flange 90 degrees to the web, but something more than that to make them match the angle of the skins (since they're a sort of "cone" in shape).
Yeah, that too... sucks to have to go back and make them "un-square" again because you got a little carried away with the prep work. Please don't ask how I know this, it's just too embarrassing to admit.
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  #7  
Old 03-10-2015, 05:23 PM
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Default Thanks

Thanks everyone.
Parts are primed and ready to rivet, sans fluting.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #8  
Old 03-10-2015, 05:36 PM
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Default

Larry, I didn't have to flute any of those bulkhead parts at all. Maybe there's enough slight variation in these parts, that yours might require it. But I didn't have to touch mine. Cleco all the skins on and see how things fit, if you haven't done that already. You might be pleasantly surprised.
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  #9  
Old 03-10-2015, 08:22 PM
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Default Thanks

Quote:
Originally Posted by BSwayze View Post
Larry, I didn't have to flute any of those bulkhead parts at all. Maybe there's enough slight variation in these parts, that yours might require it. But I didn't have to touch mine. Cleco all the skins on and see how things fit, if you haven't done that already. You might be pleasantly surprised.
Thanks Bruce.
What threw me off is they are flimsy. Plus, I had to scrub them pretty good. They had some spots that looked like corrosion trying to start. All is good.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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