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  #1  
Old 02-19-2018, 03:51 PM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Default Pre-twisted longerons?

Wondering if anyone else who's received early shipments (November) of the RV-12-iS fuselage kit got pre-bent longerons at the aft end -- at first I figured Steps 2 and 3 of Section 23 had already been done?

I did. And they were perfectly bent.

Just one problem, as near as I can figure.

It's the wrong end, unless I'm missing something.




I didn't really notice anything until I went to fit the top piece that's curved and noticed it wasn't tracking properly. Flip the longeron around, 12 7/16" from the forward edge (exactly as the plans said) and it was a perfect fit.




I'm pretty sure, looking at Figure 1 and remembering building the 7A, the twist is supposed to be at the forward end. Right?
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Last edited by LettersFromFlyoverCountry : 02-19-2018 at 06:57 PM.
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  #2  
Old 02-19-2018, 04:13 PM
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Correct, the -7 longerons are twisted at the forward end. I'd expect the same for the -12. In the top photo, I think the left and right are swapped.
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  #3  
Old 02-19-2018, 04:34 PM
rv9builder rv9builder is offline
 
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Quote:
Originally Posted by LettersFromFlyoverCountry View Post
Wondering if anyone else who's received early shipments (November) of the RV-12-iS fuselage kit got pre-twisted longerons -- Steps 2 and 3 of Section 23 had already been done?
Hi Bob,

My longerons were pre-bent, but not pre-twisted. They are curved, but lie flat, so I'll have to do steps 2 and 3. I was disappointed they weren't pre-twisted, too!
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Last edited by rv9builder : 02-19-2018 at 04:37 PM.
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  #4  
Old 02-19-2018, 05:42 PM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Quote:
Originally Posted by Raymo View Post
Correct, the -7 longerons are twisted at the forward end. I'd expect the same for the -12. In the top photo, I think the left and right are swapped.

I just put them together to show that it's the rear that's bent . but maybe that's how it's supposed to be.
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Almost ready to start the RV-12iS finishing kit. 480 hours in.

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  #5  
Old 02-19-2018, 06:39 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Originally Posted by LettersFromFlyoverCountry View Post
I just put them together to show that it's the rear that's bent . but maybe that's how it's supposed to be.
When it is time to fit the tail cone you will find that is the way it has to be (and I am pretty sure the KAI mentions the short bends being at the aft end, and a tapered portion that gets trimmed off of the short bent leg).
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  #6  
Old 02-19-2018, 06:54 PM
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What is KAI?
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St. Paul, MN.
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Almost ready to start the RV-12iS finishing kit. 480 hours in.

Builder log
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  #7  
Old 02-19-2018, 07:02 PM
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(puts on coat at night, heads out into the ice storm and heads to the hangar. Because some things can't wait,)
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Bob Collins
St. Paul, MN.
Blog: Letters From Flyover Country
Almost ready to start the RV-12iS finishing kit. 480 hours in.

Builder log
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  #8  
Old 02-19-2018, 07:50 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by LettersFromFlyoverCountry View Post
What is KAI?
Kit
Assembly
Instructions
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  #9  
Old 02-19-2018, 09:07 PM
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Originally Posted by rvbuilder2002 View Post
Kit
Assembly
Instructions
Ah, OK. I went back out and checked. No mention of a bend in the aft end, just a note of a line for a weight-saving cut.

TFYH

Proceeding with steps 1-3 on the front end.
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St. Paul, MN.
Blog: Letters From Flyover Country
Almost ready to start the RV-12iS finishing kit. 480 hours in.

Builder log

Last edited by LettersFromFlyoverCountry : 02-19-2018 at 09:09 PM.
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