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Doping Silk or Nylon
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 Posted: 11 August 2013 09:50 pm
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AlexC
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Mana: 
When doping silk or nylon is there a technique for preventing the dope pooling under the covering and gathering in and around spars etc?

 

 

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 Posted: 12 August 2013 08:30 am
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Phil F
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Hi Alex . Are you thinning the dope correctly ? 50;50 . The dope should be really quite thin and any pooling as you describe should evaporate away.It should go through a certain amount so as to fix the fabric to the framework to create strength. What type of brush are yo using ? We used to use dope mops that had very soft fine hairs . Stiff brushes will squeegee the dope through the fabric . have you tried spraying it on ? My prefered option when I have used it . I must admit I last used dope on nylon about 15 years ago . I now use Light span as its already fuel proof and convenient. Mike Smith is member of our club and forum ,he's an excellent builder who uses dope and traditional techniques , Give him a PM I'm sure he will give some sound advice .



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 Posted: 12 August 2013 08:55 pm
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AlexC
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Thanks for the tips Phil.

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 Posted: 13 August 2013 12:59 pm
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Mike Smith
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Alex

I can confirm what phil says.

Pooling is a problem and indicates to much dope at one time.

The following method removes this problem.

I use a silk over tissue method that takes time but has a superior finish. This can be used with nylon as well. The tissue gives the shape and the silk / nylon gives the strenght and is easy to apply over the tissue.

Please see my website http://www.freeflightscale.com under technical tips for details of this.

If you need any other info let me know.

Mike

 



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 Posted: 13 August 2013 05:34 pm
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AlexC
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Hi Mike, The silk over tissue is interesting. I think I will try that technique with a vintage model that I was given by an elderly club member. The model is a Sport Wagon dating from the forties. It was partially covered in heavy Glosstex.  

I found a video of the model flying here: Badly!

http://www.youtube.com/watch?v=8Kzf8j4j7bg&feature=player_embedded

 

Attachment: sportwagon.jpg (Downloaded 390 times)

Last edited on 13 August 2013 06:31 pm by AlexC

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 Posted: 13 August 2013 09:28 pm
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Mike Smith
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Alex

That should be ideal for the covering.

Mike



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