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Old 10-01-2012, 08:17 PM   #5
pd1
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Default The Great Pumpkin rises

Started covering.

First up I like to balance the wing just before covering, the wing needed 10 grams to balance. I drilled a few holes in the wingtip, added B B's and then put a sheet of balsa over them.
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Start covering.. I like to cover the trailing edge of the wing and wing tip parts before the main cover.
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I like Du Bro pinned hinges, I hold them in with a wooden toothpick.

I cut the covering large enough to do both sides of the aileron with one piece. After attaching the covering to the leading edge of the aileron, I added the hinges. then ironed down the bottom side of the covering.
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The trailing edge was trimmed and then the top side of the aileron covering was ironed down. I use as low a heat setting as I can to just get the covering to stick and not shrink at this time.
After the aileron was covered, I hinged the aileron to the wing with toothpicks. After the wing is covered they won't show.
If the control surface ever has to come off, it's easy to just punch the toothpick out and remove the surface.
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Covering the lower half of the wing. I lay the oversized sheet on the wing and using the lowest heat setting.
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I tack the highest part of the root of the wing. I then pull the covering tight and tack the tip then the leading edge and trailing edge. By only tacking in small places at first, the covering can be re positioned until most of the wrinkles are out and it is tacked all around the perimeter.
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Once the perimeter is tacked I like to seal around the perimeter to about the width of the iron, I use a little higher temp setting for this.
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Then I trim the edges and iron them down.

Last, the heat gun should get the remaining wrinkles out. One weird part is once the heat from the gun is applied, the covering slackens up a lot. Keep the gun moving and keep heating the covering and the covering will start to shrink again.
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Wing covering finished

I finished the orange base color for the wing.
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The tip of the top wing has a pronounced compound curve in it, much more the the bottom of the wing.
I did the tip first so that I would be working with a smaller more manageable size of covering. Also if I messed it up, less waste.
Also the seam at the tip will not be very visible because there will be a sunburst white over most of the tip.
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