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lwinger
Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA
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 Posted: Thu Aug 10, 2006 8:21 pm Post subject: Rudder skin bending technique |
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As a 601XL scratch builder, I'm looking for guidance on bending my rudder skins. I have watched the "Scratch Building Basics" DVDs and will use their technique unless I hear differently from the list.
In case you don't know, they do the following:
Trailing edge skin -- They start the bend in the bending brake (which I have). They then move it to the worktable and complete the bend with even pressure on a 2x4. They bring it to a fairly sharp bend (presumably without exceeding a minimum radius).
Leading edge skin -- They bring the ends together on the top of the worktable, and produce a smooth and broadly curved nose by gently applying pressure on the 2x4.
Based on your experience, what works the best? Sorry if I missed a similar discussion in the archives.
Larry Winger
Tustin, CA
Scratch building 601XL
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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger |
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admin(at)arachnidrobotics
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| Posted: Thu Aug 10, 2006 8:41 pm Post subject: Rudder skin bending technique |
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I hate to say it, but that's the best method unless you have access to a hydraulic press brake. I had good luck using an 1/8" top punch in a .472" acute bottom die. I was only able to hit a 30 degree included angle, but it was close. Add a little pressure from a 2X4 (there's no getting away from that 2X4!), and it was a beautiful looking rudder skin.
I used the table and 2X4 method for the Horizontal Tail skin, due to the larger radius. I got good results, but it's IMPERATIVE that you apply even pressure ALL along the full length to avoid smiles in the material. (Yeah, I went through two Horizontal Tail skins too. lol) A second person makes the job much easier, IF they understand they need to take their time. Inform them ahead of time that their impatience may cost them $100 for a new skin.
Larry Winger <larrywinger(at)gmail.com> wrote: | Quote: | As a 601XL scratch builder, I'm looking for guidance on bending my rudder skins. I have watched the "Scratch Building Basics" DVDs and will use their technique unless I hear differently from the list.
In case you don't know, they do the following:
Trailing edge skin -- They start the bend in the bending brake (which I have). They then move it to the worktable and complete the bend with even pressure on a 2x4. They bring it to a fairly sharp bend (presumably without exceeding a minimum radius).
Leading edge skin -- They bring the ends together on the top of the worktable, and produce a smooth and broadly curved nose by gently applying pressure on the 2x4.
Based on your experience, what works the best? Sorry if I missed a similar discussion in the archives.
Larry Winger
Tustin, CA
Scratch building 601XL
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naumuk(at)alltel.net
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| Posted: Fri Aug 11, 2006 3:05 pm Post subject: Rudder skin bending technique |
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The stab can be done by one person, but I scrapped0 one before getting it right. I finally did it by screwing stop blocks on my0 table. Just to keep the edges square- not to hold anything down other than with0 duct tape.
Bill Naumuk
40%HDS
Townville, Pa
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Fri Aug 11, 2006 4:34 pm Post subject: Re: Rudder skin bending technique |
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I made mine without a brake by starting with a rectangle and folding it like paper. Hold the edges and bend it to a stop, 1/4" high, for the radius.
Here is a link showing how:
http://www.mykitlog.com/users/display_log.php?user=rlendon&project=113&category=1280&log=9949&row=67
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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/
Last edited by Ron Lendon on Mon Aug 14, 2006 4:07 pm; edited 1 time in total |
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lwinger
Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA
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| Posted: Fri Aug 11, 2006 4:50 pm Post subject: Re: Rudder skin bending technique |
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Ron,
What stop did you use? I see no reference in the plans to the radius.
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Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger |
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naumuk(at)alltel.net
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| Posted: Sat Aug 12, 2006 4:43 am Post subject: Rudder skin bending technique |
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Larry-
Are you talking about the rudder skin or the stab? If it's the stab, the
old hand drawn builder's manual shows that you use an 18mm board against
what will be the leading edge to keep you from pushing down too far. If it's
the rudder skin, the Homebuilder's Help DVD shows it just being folded over.
The ribs provide the final radius.
Bill Naumuk
40%HDS
Townville, Pa
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lwinger
Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA
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| Posted: Sat Aug 12, 2006 6:03 am Post subject: Rudder skin bending technique |
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I was talking about the rudder skin. Thank, however, for the advance info on the stab.
Larry Winger
On 8/12/06, Bill Naumuk <naumuk(at)alltel.net (naumuk(at)alltel.net)> wrote: [quote]--> Zenith-List message posted by: "Bill Naumuk" <naumuk(at)alltel.net (naumuk(at)alltel.net)>
Larry-
Are you talking about the rudder skin or the stab? If it's the stab, the
old hand drawn builder's manual shows that you use an 18mm board against
what will be the leading edge to keep you from pushing down too far. If it's
the rudder skin, the Homebuilder's Help DVD shows it just being folded over.
The ribs provide the final radius.
Bill Naumuk
40%HDS
Townville, Pa
---
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger |
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