Tips - Throw Pegs

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The following comments are mainly from the SALGlider e-mail list.

1) Throw Peg Size and How to.
2) Rick Walba? - Make a Throw Peg his way.
3) SuperGee II - Plan Spec of the Peg
4) Mark again, earlier post on Allegro-Lite
5) Peg Hard Point
6) Existing Peg Reinforcement
7) The good, the bad and the plain Ugly

1) Throw Peg for SuperGee II

Mark Drela - 12th Nov 2003 - SALGlider 4914

I make mine from 0.060" x 3/8" wide carbon prepreg, 1.75" long. I shape it in three steps, with 120 wet/dry in the sink to prevent dust.

1) Make the ends roughly semicircular in shape.

2) Round off the rear edge on the inside, where your fingertips slide off.

3) Give it an elliptical LE and taper the thickness towards the tips, but don't touch the rounded rear edge created in step 2.

I've also seen advice recently to seal the surface with some thin CA after sanding (as this stops any fragments becoming part of your fingers...). So probably shape, seal with CA, sand very lightly again, repeat etc, until it is nice and smooth :-)

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2) Rick then followed up with his method.. but can I find the e-mail!!!!...

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3) The SuperGee II plan

This has the following spec: 0.06" x 0.35" CF Finger Peg

And here are a couple of pictures (Click on them for a larger version)

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4) The original SuperGee ? (I'm not sure)

Mark Drela - 20th March 2002 - Allgro-Lite 2405

The peg is 60 mils thick, but 350 mils (almost 3/8") wide. When pulling against the large centrifugal load, the fingers press against the wide 3/8" dimension -- better than even a 1/4" rod. The only wear and tear it causes is when the fingers slide off the rear edge of the peg on release. Rounding off this edge appropriately helps that a lot. I also sand an airfoil-type nose on the front edge. Such a peg has a small fraction of the drag caused by a round peg.

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5) Peg Hard-point

Kevin Sharbonda - - SALGlider

It is also not a bad idea to create a mounting place similar to the hardened off area where the wing bolts mount. Hogging out a small diameter area of foam and filling with epoxy thickened with micro spheres. Then inserting the peg through the middle, cleaning up excess and aligning while the glue sets. Sometimes slipping another piece of Kevlar or glass over the top for cosmetic finish and wetting out.

Cut away one side only of the skin and create a small hole for the peg in the middle. Tape in the peg from the back and fill the other side with the thickened epoxy mixture and slip the piece removed back over till everything sets!

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6) Existing Peg Reinforcement

Recent posts suggest the current practice is to wrap a wetted out carbon fibre tow around the peg and then flatten the two ends (for an inch or so) onto the wing surface coming inboard from the peg. The ends create a bow shape on the wing surface.

The area where the tow goes from vertical around the peg to flat inboard is quite small and seems not to effect performance. Ugly but effective is the opinion given (I think by Paul Clark)

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7) The good, the Bad and the plain Ugly

Here are a range of pegs and ideas for grabbing the tip and throwing your creation skywards.

Loosely grouped and in no particular Order.

SuperGee II Tip Peg:

SuperGee II Mimic 1