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Author Topic: Lost foam method and more questions...  (Read 1186 times)

Offline jim gilmore

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Lost foam method and more questions...
« on: November 20, 2015, 10:02:11 PM »
My first question is is there some place I can see what the lost foam method is ???
I'm wondering if it could be used to build a better lighter wing for MY half A type models which are about 33 inch wingspan.
Problem is the arrow shafts I have are only 29 inch long....

Also is there a video for I beam construction and what is the current price....considering tis as My Xmas gift to myself....


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Offline Tim Wescott

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Re: Lost foam method and more questions...
« Reply #1 on: November 21, 2015, 04:24:14 PM »
Overkill is never overkill.

You can get long carbon fiber rods from online kite shops.  No, I can't remember the name of the one I used (Wind something, or something Wind -- and no, that does not narrow it down).

Bob has posted series of pictures somewhere on the forum recently.  The short story is:

  • Whack out a set of foam cores as if you were going to build a wing from foam.  Save the shucks, they're part of the jig.
  • Whack the cores up right where you want the ribs to be
  • Bob has a fancy way of hardening the edges of his core pieces so that you can use the to sand the ribs to perfection.  It involves glue.  I know no more
  • Cut ribs using the whacked-up core as guides
  • Build everything into the shucks that you so wisely saved
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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Tim Wescott

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Re: Lost foam method and more questions...
« Reply #2 on: November 21, 2015, 08:55:22 PM »
Between the two of these is a very succinct, yet complete, view of the lost-foam building process.  If you can get your head wrapped around the search function, search on lost foam and see what you get.

http://stunthanger.com/smf/building-techniques/lost-foam-jig-my-first-time/
http://stunthanger.com/smf/building-techniques/cutting-a-set-of-ribs/
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.


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