Building materials, covering

jander14indoor
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Building materials, covering

Postby jander14indoor » August 6th, 2009, 3:18 pm

Since we have a dedicated board for WS now, I thought it might help to organize by kicking off topics around the typical WS questions. Content of string to be driven by subject line (I hope).

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Re: Building materials, covering

Postby danyalukin » September 8th, 2009, 5:59 pm

Is there a sufficient difference between 5 micron and .9 micron mylar?
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Re: Building materials, covering

Postby jander14indoor » September 9th, 2009, 3:48 am

Well, the 5 micron will be 5.5 times as heavy. Actually meant for outdoor covering, kind of overkill for SO for strength, but can probably be used if its what you have available. You just have to plan accordingly. You might check light tissue or very light shopping bags in your area for weight, might be lighter and plenty strong enough.

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Re: Building materials, covering

Postby blue cobra » September 9th, 2009, 11:40 am

I've always (for all of one season anyway) used produce bags. They're lighter than shopping bags (I assume), and work great. All of my planes were around 6.5-6.8g before ballast. I really don't see how buying film covering could be much better than using the free produce bags. In an f1d you need to be as light as possible, but I found it very easy to make 7g planes without paying much attention to weight.
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Re: Building materials, covering

Postby bob3443 » September 10th, 2009, 4:43 pm

blue cobra wrote:I've always (for all of one season anyway) used produce bags. They're lighter than shopping bags (I assume), and work great. All of my planes were around 6.5-6.8g before ballast. I really don't see how buying film covering could be much better than using the free produce bags. In an f1d you need to be as light as possible, but I found it very easy to make 7g planes without paying much attention to weight.

Actually last year i was thinking of which bag would be lighter, i also though produce bags, but then i cut a 6in square from a produce bag, a shop-rite bag, and a a.c.more bag. Turns out the a.c.more bag was lightest, then produce then shop-rite.
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Re: Building materials, covering

Postby swimmerdude5 » September 24th, 2009, 4:57 pm

HI, I've tried many times to put mylar wrap onto my balsa plane but it's always to static. i bought something that removes some of the static but it won't work. Can someone help me?
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Re: Building materials, covering

Postby blue cobra » September 24th, 2009, 5:00 pm

Try rubbing it on your hair :)

I really don't know, but I do that sometimes when tape is too static, and it seems to work. It can't really hurt.
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Re: Building materials, covering

Postby smartkid222 » September 24th, 2009, 5:14 pm

swimmerdude5 wrote:HI, I've tried many times to put mylar wrap onto my balsa plane but it's always to static. i bought something that removes some of the static but it won't work. Can someone help me?


do u crumple your mylar into a ball before you put it on?
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Re: Building materials, covering

Postby swimmerdude5 » September 24th, 2009, 5:42 pm

No I do not, if you are then how do you get it out a ball when it's all stuck together?
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Re: Building materials, covering

Postby bob3443 » September 24th, 2009, 5:58 pm

swimmerdude5 wrote:No I do not, if you are then how do you get it out a ball when it's all stuck together?

I'm not sure but are you suppose to iron it or something?
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Re: Building materials, covering

Postby andrewwski » September 24th, 2009, 6:06 pm

Mylar - no, you'd melt it. Japanese tissue, yes, without steam.
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Re: Building materials, covering

Postby Greg Doe » September 24th, 2009, 7:33 pm

Don't iron the mylar. It will melt. Surprisingly crumpling the mylar greately reduces the static cling.
Gently crush the mylar into a ball. Then spread it out on a smooth surface. Transfer it to a stretcher frame. Make the stretcher frame large enough to cover the largest surface you will be covering on your airplane in one piece; that will probably be one wing panel.(half of the wing). Time spent on making a good stretcher frame will be well spent. This year that will be 20 CM, but make it at least a half inch longer for convience. Use chap stick on the edges of the stretcher frame.The chap stick will allow you to pull any large rinkles out of the mylar before it is transfered to the airplane surfaces. Use glue stick, or 3M 77 (or similar) contact cement on the wings, sparingly. Working with mylar is tedious, and requires a lot of patience! It would be advisable to start with a rudder or elevator so that if you make a mess, you will have less time in building a replacement part.
Again, working with the mylar will try your patience. For this reason I have my students cover their first airplane with tissue. Good luck.
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Re: Building materials, covering

Postby jander14indoor » September 25th, 2009, 3:13 am

I actually cover the wing in one piece. Depends on your source of mylar. If a piece from a kit, it might not allow that, but if from a roll you can generally orient it so you can use one piece.

And don't forget grocery store bags. The light, flimsy, annoying ones. If you look around you can find them much lighter than tissue, and only a little heavier overall than indoor mylar films. Last year my 7 gm demo plane was covered with Home Depot bags as they were the lightest I found at the time. This year it may be another store, tends to vary a lot by batch. Its free (except your time) can have pretty logos or silly savings, has all the advantages of mylar (no shrinking) and is easier to use.

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Re: Building materials, covering

Postby swimmerdude5 » September 27th, 2009, 8:23 pm

Where can i get a good stretcher frame. Thanks for the tips but in the wing there are other pieces of wood between do i just put mylar on top of it all or between each and every one of the? Also how can i stick the grocery bag onto the wood?
"To build is the noblest art of all the arts. Painting and sculpture are but images, are merely shadows cast by outward things on stone or canvas, having in themselves no separate existence."
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Re: Building materials, covering

Postby jander14indoor » September 28th, 2009, 3:48 am

You make it, not exactly a commonly used item.

See the following article on the National SO web page for Wright Stuff:
http://soinc.org/sites/default/files/up ... icfilm.pdf

Note, while I like using grocery bags for cost, and, frankly, outrageousness, they vary greatly in weight. I've seen from area density ranging from 5 gm/m2 of condenser to over the 20 gm/m2 of Saran Wrap (and note that Saran Wrap is the heaviest listed, nasty stuff). Make sure you are using the light stuff or stick with tissue in the 8-11 gm/m2 range.

See also this article from the Indoor Duration website with some pictures:
http://www.indoorduration.com/INAVCovering.htm

Finally, for SO planes, I seldom bother with a frame. I just spread the covering smoothly on clean poster board and drop the glue sprayed frame on it.

Jeff Anderson
Livonia, MI


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