Free drawing mini-DLG 1 meter - Page 6 - RC Groups
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Jul 30, 2008, 12:34 PM
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I have some Coverite Microlite, which is about 17 grams per sq-yd. The wing is about 220 sq-in, which means I would theoretically add 6 grams if I covered the entire wing. If I went with the ribbed design, I would conservatively estimate about 30% weight loss. So, a 90 g wing would be 63 grams. I would be conservative and say that the covering adds 10 grams. That would be a 73 gram wing, which is not so bad.

But, I don't know if that is worth the trouble. I'll probably just move forward, and see how the plane flies. If it seems it can benefit by the weight loss, I'll do it retroactively.
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Jul 30, 2008, 05:32 PM
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Frans Bal's Avatar
71 gram for a completed glas wing is very nice.

Typical weight anything from 130 to 160 gram.
My MiMi weighs 135 gram without balast.
Normally i fly with a little balast at 165 gram.
With high winds you can balast it to 200 gram.

Jul 30, 2008, 06:45 PM
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This is my progress so far Should be ready to maiden this weekend
Jul 30, 2008, 08:23 PM
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David Forbes's Avatar
That looks like fun, but you guys need to learn how to cut foam. It's not that hard, all the info is here on
RCGroups (at least that's where I learned). I'm flying a full house flaperon 1m ship at 130 grams, yes , I know that is porky by Apogee Elite standards, but it works for me. And Frans is right, when the wind comes up it needs more pork.
Jul 31, 2008, 01:14 AM
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If I were to make this a polyhedral wing, what would be the upside/downside? Also, what would be the recommended angles on a polyhedral wing?
Jul 31, 2008, 07:07 AM
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David, are you sheeting your foam wings or glassing them?
Jul 31, 2008, 08:51 AM
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David Forbes's Avatar
They are glassed using mylar carriers in a vacuum bag.
Jul 31, 2008, 09:22 AM
Say when.....
quigley257's Avatar
Originally Posted by Ikarus2000
This is my progress so far Should be ready to maiden this weekend
Looking good Ikarus!! I am looking forward to building one of my own. Nothing like starting with a piece of paper and building from scratch. I may try to cut and bag my wings, but I have not done any real wing bagging yet. I have all the equipment, just need to learn how to use it .

Jul 31, 2008, 01:01 PM
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Thanks Quigley, I cant wait for the maiden!
Aug 01, 2008, 01:19 PM
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Okay, I guess I could have gone with the squared off wing tips, but I decided that I liked the rounded look. I taped the two tip panels together, and sanded the shape, to ensure symmetry. Then, rather than just sand the airfoil by eye, I wanted to make sure that I got it right.

So, I traced the wing tip on a graph paper, and came up with some templates, using Profili.
Aug 01, 2008, 06:05 PM
Thermal Naked!
Hossfly72's Avatar
You are a slave to the details Mr. M!! It looks beautiful though and I can't wait for the flight report.
Aug 01, 2008, 09:05 PM
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The last time I made an all wood Apogee wing, the TE curled up. This time, with the strip of hardwood, it stayed dead straight. So, I'm very happy with the result, and don't want to muss it up.
Aug 02, 2008, 11:47 PM
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Okay, some more progress today. I decided to glue the panels with Duco, to keep the weight down. I used the double gluing method, with tape to hold them together, like I did when I joined the wood planks to make the wing blanks. I'll probably use epoxy for the center joint, however.
Aug 03, 2008, 02:38 AM
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Okay, some more progress tonight. To glue the center joint, I use West System's laminating epoxy, because I still have a lot left over from building a kayak.

As with other joints, I tape the two sides together, then open it using the tape as a hinge. I apply some unthickened epoxy, which is soaked up by the end grain very quickly. Then, I add some cabosil to the remaining epoxy, until the consistency is like thick syrup. The thickened epoxy is applied to both sides, and allow to sit for a couple of minutes to allow the wood to soak it up a bit.

Then, I close the joint and block up the wing. Glue will squeeze out on top of the joint, which I wipe with a gloved finger.
Aug 03, 2008, 08:36 AM
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kimhey's Avatar

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