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Elevator

 
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rhansen16



Joined: 31 Jul 2007
Posts: 9
Location: New Mexico
PostPosted: Tue Jul 31, 2007 6:34 pm    Post subject: Elevator Reply with quote
I spent the entire day working on the elevator skin and it may become a decoration piece for the "airplane factory". I put the bottom skin on, no problem rolled the top on and had a very hard time getting it to square up. When I finished and got it all together, one of the elevator tips sits higher then the other. The leftover material across the trailing edge is not equal. Any ideas where I messed up and is it fixable? For pics see my website --- http://websites.expercraft.com/rhansen/
Rob

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Rob Hansen
http://websites.expercraft.com/rhansen/
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psm(at)ATT.NET
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PostPosted: Wed Aug 01, 2007 3:07 am    Post subject: Elevator Reply with quote
Quote:

I spent the entire day working on the elevator skin and it may
become a decoration piece for the "airplane factory". I put the
bottom skin on, no problem rolled the top on and had a very hard
time getting it to square up. When I finished and got it all
together, one of the elevator tips sits higher then the other. The
leftover material across the trailing edge is not equal. Any ideas
where I messed up and is it fixable? For pics see my website
--- http://websites.expercraft.com/rhansen/
Rob


Hi Rob,

I can't tell from your question whether the problem is a difference
of 1 mm or 50 mm. If it is small (perhaps around 10 mm difference)
then it could be many things. If it is large (perhaps 50 mm) then
you probably just made a big mistake in your cutting of the skin.

The three biggest things that come to mind for small but noticeable errors are:
1. Failure to square up the skeleton before attaching the skin. It
helps to fix it in place after squaring to keep it from moving while
marking and drilling the skin. I usually use small blocks held in
place with screws from the crate for this kind of holding.
2. Twist induced from an "Un-flat" bench top. It pays to spend the
extra time to get your bench as flat as possible.
3. Riveting induced twist. If you rivet a long line of rivets from
one end to the other then the rivets will pull the part quite a
distance and cause a twist. This can be avoided by alternating the
chosen rivet to pull on opposite sides of center. Some people use a
simple pattern back and forth, while I prefer a more random choice.

Good luck,

Paul
XL fuselage

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sky_ranger161



Joined: 07 Jun 2006
Posts: 91
PostPosted: Wed Aug 01, 2007 3:07 am    Post subject: Elevator Reply with quote
Hey Rob!

Can you give us a few more detailed pics? It's hard to tell from the ones on your site exactly what's going on. From just looking at the ones posted, it looks like you may have distorted the structure a little by tightening the straps a bit too much, but that's just a guess at this point.

Feel free to contact me off-list with some more pics and info if you like. I'm no expert, but I've certainly bent more than my share of parts in directions they're not supposed to go.

My email address is sky_ranger161 at yahoo dot com

Debo Cox
XL/Corvair Scratchbuilder
www.mykitlog.com/debo
Nags Head, NC
Right wing in progress

do not archive
Luggage? GPS? Comic books?
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rstone4(at)hot.rr.com
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PostPosted: Wed Aug 01, 2007 3:21 am    Post subject: Elevator Reply with quote
Rob,
I read the part of your web site about building the elevator and have this to say about measuring. There is an old saying about building anything and it is:

  Measure twice, cut once

Tracy Stone
Harker Heights, Tx
ZodiacXL w/Jabiru 3300



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