|04-01-2007, 10:43 AM||#11|
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I am: Dave F
Join Date: Feb 2004
Location: Oakville, Ont.
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To keep edges of cloth from fraying, spray it with 'spray starch' used for ironing clothes. Not much is needed.
It has worked for me cutting small pieces of .75 oz glass cloth.
I picked up this from a 'handy hints' section of a 60's model mag. It was for keeping the edges of silk from fraying.
Unabashed Combat Team
|04-01-2007, 05:38 PM||#13|
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One last (I hope) comment. I got a PM from a guy requesting clarification. In the Stits system I use, I shrink the fabric to the overall tension I want, and apply one coat of clear weave-filling Stits paint BEFORE doing any taping.
On that subject, Dacron has a wonderful shrink characteristic. With an iron at 225 farenheit no shrinking occurs: nice for smoothing and drying when applying tapes and fabric. At any temperature up to 350 it will shrink an exact percent. That is, if you have heated dacron to 270 for example, a heat of 260 will do nothing. But a heat of 280 will produce further shrinking. I always try to have it drum tight around 300 degrees, so I have further help if something loosens. Sometimes it will loosen where tacked down from solvent action in the paint applied after laying down the fabric. Another reason why taping over seams (leading edges especially) is not just cosmetic. Anyway, at 350 degrees the fabric starts to melt and will sag forever, which is time to get out the solvent and the garbage pail.
Dacron can still be tightened a bit even with a couple of coats of Stits paint. I always seem to find one little wrinkled corner when the aluminum coloured coat goes on....
With Stits I can't emphasize enough that any mistake (except overheating) is fixable. MEK will remove any and all paint, and even the adhesive if you are stubborn. My Waco is just darn huge, so sometimes I get tired of the process, but generally it is plain old fun. After all, from a scale perspective, it is exactly the same materials and methods used on full size aircraft. Also, we need to visit full size aircraft to understand that perfection is not the usual condition.....but fun is.
The best iron for temperature stability, repeatability, accuracy is the Coverite 21st century iron. Unfortunately, its non-stick surface collects melted Stits paint more readily than my ancient Top Flight grey teflon iron, which I now use most. I constantly check temperature with a little Duratex Flaskpoint infared thermometer like the car guys use on their hot little engines. Picture enclosed.
PS: how did we ever get along before they invented cheap digital cameras?
|04-28-2007, 05:23 PM||#14|
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I am: Peter C
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A technique for simulating pinking tape has been descibed in an article by Chris Spangenberg in High Flight magazine, Vol 27, No 4.
He used trim tape to create the underlying reinforcing tape, then simulated the pinking tape using two or three coats of primer and a serrated edge mask.
That way he avoids all the fuzzy edges. He gets the masking from GetStencils.com
Sounds like a very similar process to one method for creating panel lines.
Kawartha Lakes RC Flyers
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