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  #11  
Old 13-07-16, 13:00
rmmitchell rmmitchell is offline
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Quote:
Originally Posted by magicaltrev View Post
Digressing slightly but what method would you use to make a wing yourself? It's on my to-do list and have pondered the various ways.
Best method is probably a moldless foam Rutan-type method. Hotwire sections, put onto spars and skin with CFRP (Pre-preg or Resin Infusion. Vac Bag at mildly elevated temp (carefully supported).

Might involve a but of sanding and filling of the foam before lay-up. But I is not a proper composites engineer. :-)
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  #12  
Old 13-07-16, 14:04
RaceMag RaceMag is offline
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I've made a couple of mould-less wings with fibre vacuumed onto hot wire cut XPS foam cores and would not recommend it as skin separation was an issue. I used Profili to enter Benzing data points and the wing turned out OK - it certainly worked as it induced understeer and higher top speed in comparison to the previous barn-door of a wing. Mind you this was on a sports sedan and not a single seat car.
Were I to make another wing and I think I am them I would like to try a mylar lined hot-wire cut foam bed as a mould.
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  #13  
Old 13-07-16, 14:18
rmmitchell rmmitchell is offline
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Interesting. To be honest, I've not tried this method yet myself No room to do it at the moment..

I've never felt rich enough to invest in Burt Rutan's book on "moldless".

My experience is split between nasty wet lay-up stuff many years ago and prepreg autoclave stuff.

How do you bond the skins to the foam core? Is it just relying on the resin or do you use 2 part or film adhesives?
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  #14  
Old 13-07-16, 14:33
RaceMag RaceMag is offline
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Pretty much the same method as with RC gliders. An upper and lower mylar skin, onto which you layup the CF and FG and epoxy resin, then Roll out a tape of CF for the LE. Put the skins on the foam and vac-bag it. There are a lot of video's on youtube detailing different peoples processes. I'd be more likely to resin infuse these days.
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  #15  
Old 14-07-16, 02:56
RaceMag RaceMag is offline
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Sorry didn't have much time last night to find a video. This covers the basics.
https://www.youtube.com/watch?v=ielx1n5uIQc
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  #16  
Old 14-07-16, 03:27
RaceMag RaceMag is offline
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Thanks for the link on the Benzing book. 15UKP was a good price.
The moulding process well explained in this series of videos, even if they are a bit long. :
https://youtu.be/RrIthVDNlpY

Last edited by RaceMag; 14-07-16 at 04:10.
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  #17  
Old 19-07-16, 13:38
RaceMag RaceMag is offline
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http://www.mediafire.com/download/1i...s_car_aero.xls
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