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Author Topic: foam wing  (Read 1877 times)

Offline Bootlegger

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foam wing
« on: November 26, 2012, 06:12:40 AM »

  Guy's when you are building a foam wing and installing a balsa leading edge, what method do you use to shape it to a symetrical all the way from root to tip?

  Thanks a lot, Gil
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Offline Robert-Jan

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Re: foam wing
« Reply #1 on: November 26, 2012, 07:29:35 AM »
I Like the igor way with 2 templates.

Greetings Robert-Jan
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Offline Bill Little

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Re: foam wing
« Reply #2 on: November 26, 2012, 07:47:02 AM »
Brother Gil,

Some plans have a template shown on the plans.  If not, make one.  I use a Solingen razor plane to begin the shaping, taking an amount off one side then the same from the other side.
Then finish with 40 grit then finer.  I finish with a 22" long sanding block and 320.  I "roll" the sanding block over the edge, so to speak.

I think you should always use a template and your eyeballs. ;D

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Offline Avaiojet

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Re: foam wing
« Reply #3 on: November 26, 2012, 08:08:12 AM »
Gil,

Bill's advice is good advice, I work the same way. Shadows can reveal the shape of the LE as you progress.

I also make jigs. Nothing complicated as you can see from the photos.

As Bill said, you can get templates of the LE or the full rib, off the plans. Simply cut the jig in a scroll saw and apply sticky sandpaper inside. Has to be correct.

One thing though is the importance of a center line on the LE. Careful not to sand it away in the beginning.

Last thing. I sometimes run a length of masking tape along the edge of the LE block on the sheeting. Keeps the sheeting from getting sanded.

I've always used light 1/16" sheeting.

This wing is in limbo. it's for a electric DF model I will eventually get around to.

What's your project?

Good luck!

Charles
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Offline Robert-Jan

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Re: foam wing
« Reply #4 on: November 26, 2012, 10:25:07 AM »

Look at part 7

How to build wing - F2B Max (controlline) Part 1.


How to build wing - F2B Max (controlline) Part 2.


How to build wing - F2B Max (controlline) Part 3.


How to build wing - F2B Max (controlline) Part 4.


How to build wing - F2B Max (controlline) Part 5.


How to build wing - F2B Max (controlline) Part 6.


How to build wing - F2B Max (controlline) Part 7.


How to build wing - F2B Max (controlline) Part 8.



Greetings Robert-Jan
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Offline Avaiojet

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Re: foam wing
« Reply #5 on: November 26, 2012, 10:58:29 AM »
Gil,

I finished this LE this morning. Exactly as suggested.  Doesn't have to be attached to foam, the shaping is the same.

There's much more left to do with this particular stab, but a start is a start!

Charles
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Offline MarcusCordeiro

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Re: foam wing
« Reply #6 on: November 26, 2012, 11:25:17 AM »
I guess that's why a moulded LE is much better.

Marcus
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Offline Robert-Jan

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Re: foam wing
« Reply #7 on: November 26, 2012, 11:47:05 AM »
Marcus,

How do you mold a stab LE?


Quote from: MarcusCordeiro on November 26, 2012, 11:25:17 AM
I guess that's why a moulded LE is much better.

Marcus
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Offline dirty dan

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Re: foam wing
« Reply #8 on: November 26, 2012, 12:58:37 PM »
Quote from: Robert-Jan on November 26, 2012, 11:47:05 AM
Marcus,

How do you mold a stab LE?



Install square piece of stock. Run stab LE past suitable cutter mounted in router which itself is mounted to router table.

Dan
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Offline FLOYD CARTER

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Re: foam wing
« Reply #9 on: November 26, 2012, 01:15:12 PM »
Any heavy cutting on a balsa block with a high speed cutter will almost always cause a serious warp in the wood.  Table saw, router:  no good.   I get acceptable results using a band saw at low speed and a "skip tooth" blade.  Problem there is you can only do straight cuts.

F.C.
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Offline MarcusCordeiro

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Re: foam wing
« Reply #10 on: November 26, 2012, 01:23:33 PM »
Quote from: Robert-Jan on November 26, 2012, 11:47:05 AM
Marcus,

How do you mold a stab LE?




I thought the thread was about wings...
I'm about to shape a Stab LE of the Magnum I'm building.
Sanding and eye-balling I guess.
Of course, you don't have a stab with 60" span, so it's much easier to get a better shape on the stab LE.
And when I build the wings, I'll have to sand too.
If you have the option, go with the moulded LE.
It's more work, but worth it.

Marcus
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Offline Willie Johnson

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Re: foam wing
« Reply #11 on: November 27, 2012, 05:45:14 AM »
Does anyone know what type of glue is being used in the video to join the balsa sheets for the skins?  It looks like some type of polyurethane.

Thanks,

Willie
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Offline Bootlegger

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Re: foam wing
« Reply #12 on: November 27, 2012, 06:26:09 AM »

  Willie, I use regular model glue for my skins as it can be sanded easily.  Also I use Duco cement as it is the same type glue, and works as well..
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