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Old 09-16-2006, 02:30 AM   #1
Sky Sharkster
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Default Covering Weights; The Wait Is Over!

On an earlier thread I posted some links for covering weights, they were compiled by independent testers (listed below) using a variety of measuring standards like Oz/sq/yard, Gr/Sq/Meter, etc, making it hard to compare them accurately. Well, I sent'em all through the online converter and changed them all to "Grams per Square Foot". Why? Because it's easy. Most kits and plans (in the U.S.) supply wing area in square inches and we all know that 1 square foot= 144 square inches, right?
Anyway, here they are, lightest to heaviest from the top. Some of the sites differed by a small amount so I converted those to a "Range" and for a couple of samples there already was a "range" of weights, since some of the colors are heavier than others. For further descriptions see the links on the earlier post. http://www.wattflyer.com/forums/showthread.php?t=10278
Weights in Grams per square Foot.

Produce Bags (Thin Plastic, From Target) 0.53 (See Post # 18, 24)
Japanese Tissue 0.650
Risteen Microlite (Corsair Blue) 0.81 (See Post # 20)
Risteen Microlite 0.90-0.95 (see post # 15 + 20)
Esaki Light Silk (Clear) 0.97
Risteen Microlite (Light Yellow) 1.1 (See Post # 20)
Saran Wrap (11" x 12") 1.29 (See Post # 18)
Ripstop Polyester 1.575 (see post # 15)
Coverite MicroLite (Transparent) 1.889
Nelson LiteFilm 1.950
SoLite 1.950
Airspan 2.119 (Mfg listed weights 2.229-2.601)
MicaFilm (Transparent) 2.332
LiteSpan 2.674-2.787
Light Colored Japanese Tissue, 2.749 (3 Thin coats Nitrate Dope)
Coverlite 2.803 (See Post # 10)
Colored Micafilm 3.247-3.716
Hanger 9 UltraCote ParkLite 3.37
Ultracote (Transparent Lite) 3.4
Light White Silk, 3.572 (5 Coats Thin Nitrate Dope)
Fibafilm 3.874-3.901
Micafilm (Red & Yellow) 4.0
Sig Coverall (White) 4.3
Polycover (Transparent) 4.355
Sig Supercote (Silver) 4.8
Ultracote (Transparent) 5.0
Colored Skysail, 5.087 (4 coats 50/50 Butyrate Dope)
Solarfilm 5.109-5.574 (Mfg Listed weights 4.645-6.038)
Black Silkspan, 5.216 (5 Coats Thin Nitrate Dope)
MonoKote (Colored Transparent) 5.307-5.5
Solarspan 5.574-6.503
Econokote 5.670 (See Post # 5)
TowerKote 5.670 (See Post # 16)
Aerofilm 5.574-5.669
MonoKote (Red) 5.8
SIG AeroKote Lite 5.8-6.0 (See Post # 27)
Monokote (Metallic Platinum) 6.0
MonoKote (Black) 6.0
Ultracote 6.503
Solarfilm Matt Polyester 6.503-7.432 (See Post # 12)
Polycover (Opaque) 6.533 (See Post # 7)
Ultracote (Cub Yellow) 6.6
White Japanese Tissue, 6.879 (4 Coats 50/50 Butyrate Dope)
Colored Nylon, 6.898 (6 Coats 50/50 Butyrate Dope)
SolarKote 6.967
Coverite Black Baron Opaque 7.087 (Mfg. Listed Weight)
Coverite 21st Century Film 7.276-10.4
Mokokote (White) 7.3
MonoKote (Yellow) 7.5
White Super Coverite 7.559
SIG AeroKote 7.9 (See Post # 27)
Ultracote (Pearl Yellow) 8.2
SolarTex 8.361 (Mfg Listed weight) 7.896-8.825
Coverite Colored Super 8.504
Superfabric 8.552-11.024 (See Post # 25)
Coverite 21st Century Fabric 9.638 (Mfg Listed Weight)
MokoKote (Florescent Orange) 9.4
GlossTex 10.683-11.612 (Mfg Listed weight) 10.683-12.077
WorldTex (White) 13.3
Thanks again to Paul Daniels, Fatlion (Fritz Bien + Herm Perez), Barry's Aircraft Page, Warden, Twmaster, JoJa15, David Lewis and Modelflight.com!
http://www.pldaniels.com/flying/bals...materials.html
http://www.fatlion.com/sailplanes/weights.html
http://www.modelflight.com/weight.html
http://www.bmaps.net/solafilm.html
Ron
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Old 09-16-2006, 03:11 AM   #2
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Wow that is great Ron!

Question. Did you ever get the weight for Worldtex?

Mike N

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Old 09-16-2006, 03:16 AM   #3
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Default WorldTex Weight

Hi Mike, Thanks for the kind words! I never did find a weight for "WorldTex", if you get around to it could you weigh a square foot? I'll add it in, plus any others our members contribute.
Thanks again,
Ron
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Old 09-16-2006, 03:20 AM   #4
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Ok. I have a lot of other projects in front of me before I can get to working on the Lanzo. So with the insane prices of Worldtex I'm a bit reluctant to just cut a chunk off and weigh it. However I -will- do this when I start covering that Lanzo.


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Old 09-21-2006, 01:16 PM   #5
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Default EconoKote Weight

One of the weights I was missing for the table above was EconoKote, Monokote's "Foam-Safe" little brother. From the Monokote Home page I got the weight of .20 ounces per square foot. This (5.670 grams per square foot) puts E/K slightly heavier than Transparent M/K and lighter than most of the M/K opaques. I've added it to the table.http://www.monokote.com/
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Old 09-21-2006, 01:38 PM   #6
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Default Weights

Sky Sharkster, thanks for taking the time to compile this list! This is great info. I've printed off a bunch of copies that I'll take to our next club meeting.

Always strive to be the person your dog thinks you are!
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Old 09-21-2006, 01:52 PM   #7
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SS, FYI....I used Hobby Lobby's Polycover for my last construction project and I liked it a lot. The Polycover is probably sold under another brand name somewhere but I have no idea what that would be. Anyway, I did the math on the Polycover and came up with 4.355 grams/sq foot for the transparent Polycover and about (they gave a range of weights) 6.533 grams.sq foot for the opaque colors.

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Old 09-21-2006, 03:38 PM   #8
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Wow, nice work Ron. I printed off a bunch of copies so that I can bring them to our next club meeting.
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Old 09-22-2006, 02:20 AM   #9
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Default Covering Weight List

To Warden and Vax, Thanks for the kind words! I was lucky, most of the the heavy lifting was already done by others, I just had to combine the lists and convert.
To Warden, thanks for the weights on the Polycover, I'll add it to the list. I've never used it, might have to give some a try.
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Old 09-30-2006, 08:22 PM   #10
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Default Adding Coverlite

From the Coverite site I got the figure of 0.89 ounces per square yard (2.803 gr/sq/ft) for Coverlite. About 1/100th of a gram heavier than the upper weight of Litespan. Maybe it is the same stuff!
http://www.coverite.com/covering/covq1800.html
I've added it to the table.
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Old 10-14-2006, 04:37 AM   #11
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Good job!

Coverite's Microlite is same as Solite, Nelson lite film, all three same stuff.
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Old 10-21-2006, 04:01 PM   #12
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Default And more weights...

Well, this is turning into a long process! From the Solarfilm site I got some weights that aren't exactly the same as the independent testers' weights; But they're pretty close. I've added the Mfg. weights in (...) where applicable. Also, a type I wasn't familiar with, "Supershrink Matt Polyester" is a self-adhesive heat-activated iron-on that comes in military colors, Black, cream, Olive Drab, Sky Blue, Dove Gray, Dark Red, Insignia Blue, Tan, White. Weight 6.503-7.432 grams per square foot. This is the "bottom" half of the weight scale, somewhere around Monokote Opaques, Ultracote Opaques, etc.
http://www.solarfilm.co.uk/
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Old 11-26-2006, 03:00 AM   #13
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OK, I have the weight for white Worldtex.

13.3 grams per square foot.

Mike N

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Old 11-26-2006, 05:08 AM   #14
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Default Worldtex Weight

Thanks, Mike! I've added it to the table.
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Old 11-26-2006, 01:43 PM   #15
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Default Too-Light? Sub-Micro Weights

OK, there's more, but I'm not sure they're suitable for general-purpose covering. These are a couple of "Indoor" coverings, both need a prep of "BalsaLite" or contact cement for application.
First off, Risteen Microlite from Sky Hooks and Rigging;
http://www.skyhooks.ca/covers.htm#RM
Although it shares the "Microlite" name, I'm pretty sure it's not the same as the Coverite Microlite material for several reasons; First, it needs a "prep" of BalsaRite and the C/M is self-adhesive, second it comes in 20 colors and the C/M is only available in 12. It is shown folded in packets (like Litespan + Coverlite) not rolls. Most importantly, the weight is 0.9 grams per square foot. The lightest self-adhesive "Micro" is double that figure. It also costs about twice the price of "Micros", $19.00 per pack. Sheets are 24" x 48".
Next up, this covering is designed for the "IFO" type models and is available from WildRC; Weight per square foot is 1.575 grams.
http://wildrc.com/htmlpages/orderairframemat.html
This is a ripstop polyester covering, applied with contact cement and is NOT made to be heat-shrunk. It comes in 8 very bright colors; Purple, Lime, Hot Pink, Blue, Yellow, Neon, Orange and Red. Rolls are 24" x 44" and price per roll is $9.95.
I've added the weights to the table.
If any of our readers have tried either of these coverings, please let us know how they worked out!
Thanks,
Ron
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Old 11-29-2006, 01:44 AM   #16
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Default EconoKote vs TowerKote, Same stuff?

MonoKote has a lower temp film called EconoKote. Made for covering foam, comes in 10 colors, weight (Mfg. Listed) .020 ounces per square foot= 5.670 grams per square foot. Price from Tower Hobbies $7.99 per 6' roll. They list the tensile strength as 25,000 psi.
Tower Hobbies also carries a product called TowerKote. Low temp, made for covering foam. Comes in 9 colors, weight (Mfg. Listed) .020 ounces per square foot= 5.670 grams per square foot. Price from Tower Hobbies is $6.99 per 6' roll. Tensile strength 25,000 psi.
There are 3 color differences; In addition to the regular colors, E/K comes in Circus Pink, Cream and two shades of blue, Sky and Insignia.
T/K comes in all the same regular colors, but no Circus Pink, or Cream. However, it comes in three shades of blue, Light (looks like "Sky"), Medium and Dark, which looks just like "Insignia". Hmmm....
Anyway, I've added TowerKote to the table, right next to...you guessed it! EconoKote!
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Old 12-07-2006, 07:49 PM   #17
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Thanks Ron - very useful

Regards

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Old 12-18-2006, 05:36 PM   #18
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I recently tried produce bags from Target. It weighed in at 0.53 g for a 12" x 12" square. I also weighed Saran wrap and that came in at 1.29 g for a 11"x12" square.

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Old 12-18-2006, 07:23 PM   #19
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Default Weighing In?

To Terry and Oracle_9, Thanks! I'm happy the information is useful.
To JoJa15, Welcome to Wattflyer! Thanks for the weights. Did you use contact cement to attach the covering?
I've added them to the table.
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Old 12-19-2006, 05:03 PM   #20
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Risteen Microlite and Coverite Microlite are two different products. Risteen Microlite averages about 0.95 g/sq ft. for most colors, with the exception of light yellow (usually around 1.1 g/sq ft), and Corsair blue (about 0.81 g/sq ft). You can buy Risteen Microlite more inexpensively in the U.S. than you can in Canada.
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Old 12-20-2006, 11:50 PM   #21
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Default Which "Microlite"?

Hi David, Welcome to Wattflyer! Thanks for the information and weights; I've added them to the table
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Old 12-21-2006, 08:00 PM   #22
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There's also plain mylar (no adhesive):
2um clear = 0.20 g/sq ft
2um aluminized = 0.24 g/sq ft
4um aluminized = 0.63 g/sq ft
5um clear = 0.65 g/sq ft

Film thickness is measured in um (micrometre).
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Old 01-16-2007, 01:59 PM   #23
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Thumbs down Produce bag covering

How do you use plastic shoping bag material to cover stick or
foam structures? What adhesives, techniques?

The stuff is light and strong, and the way my wife shops there will be an infinite supply of large bags.
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Old 01-17-2007, 01:39 AM   #24
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Default Stick To Plastic Bags?

Hello Magfluxman, Welcome to Wattflyer! I haven't used the plastic bag material myself, but my understanding is you use a "glue stick" or other non-heat-activated adhesive to stick it directly to the framework. The material is so thin it won't take any heat, so you can't shrink it, either.
It is used primarily on indoor models with very low wing loadings and low flight speeds.
For more info, you might trythe Micro Models thread here or Small Flying Arts; http://www.smallflyingarts.com/index.html
If you're lucky enough to have an indoor site, it's worth a try!
Ron
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Old 02-26-2007, 11:47 PM   #25
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Default Hobby-Lobby.com weighs in!

Another addition, this is definitely on the "Heavy" end of the weight scale, Superfabric from Hobby-Lobby.com. According to H/L, this is a woven fabric iron-on, with a scale weave for a "fabric" look. It is also supposed to be very strong and puncture-resistant. It comes in 8 colors, White, Yellow, Red, Orange, Blue, Old Timer (Buff), Dark Blue, Vintage Orange.
The weight for the Old Timer color is (according to H/L) 8.552 grams per square foot. The manufacturer lists the weight as 11.048 grams per square foot. Either way it's at the bottom "quarter" of the weights.
I'm guessing it's comparable to the "Tex" coverings, most of which are textured fabric-types, and generally heavier than the smooth plastic-types.
I've added it to the list.
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