Fiberglass fuselage cores  
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All Forums >> RC Airplanes >> Composites Fabrication And Repair >> Fiberglass fuselage cores
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Fiberglass fuselage cores - 7/6/2003 10:03:49 AM   
A5fly


 

Posts: 36
Joined: 5/29/2003
From: Stillwater, OK,
Status: offline 		I have read several threads on this site about the best way to lay up a fuselage in a mold. It seems that the most common way is to lay up glass layers until one gets to a rule-of-thumb of about 8-10 oz/yd^2 For example, two 2 oz layers with a 6 oz in-between. I have tried this on a test "tube" mold I made and the part sort of feels like a soft plastic "whiffle ball" bat.

Does anyone ever use 1/16 balsa as the core similar to what is done in a wing? By my calculations, and a sample piece I made, two 2oz layers sandwiching 1/16" balsa weighs the same as would two 2oz layers and a 1.5 oz layer of glass, but is considerably stiffer than even the 2+6+2!

Has anyone tried this? I am guessing that in some parts of the fuselage it would be difficult to cut the balsa skin to shape.
       Post #: 1

Fiberglass fuselage cores - 7/6/2003 3:35:40 PM   
SigKavalier


 

Posts: 233
Joined: 9/3/2002
From: Water Valley, MS, USA
Status: offline 		I have seen a similar technique but instead of balsa they used foam sandwiched in between. It was depron or zepron I believe which can be had in several different weights, and in the thin weight is plyable enough to fold a paper airplane out of.


_____________________________

SigKavalier quotes...
"She was humming along nicely until the wings came off."

(in reply to A5fly)
       Post #: 2

Fiberglass fuselage cores - 7/6/2003 11:42:55 PM   
A5fly


 

Posts: 36
Joined: 5/29/2003
From: Stillwater, OK,
Status: offline 		I worry about using foam for that purpose because it has very poor compressive strength, so the skins are likely to buckle unless heavier glass is used.

(in reply to A5fly)
       Post #: 3

Fiberglass fuselage cores - 7/7/2003 6:40:01 AM   
davidfee



Posts: 691
Joined: 6/21/2003
From: San Diego, CA, USA
Status: offline 		Actually, foam works just fine for that purpose. You can easily hotwire blue/pink/grey foam into thin sheets and use that... or you can buy thin rohacell... or you can use balsa. Your pick. They all work just fine.

I wouldn't use 1-pound white bead foam though... almost no compressive strength and very uneven density.

-David

(in reply to A5fly)
       Post #: 4

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