Gliders > Thermal / Flat field
Supergee type DLG build
joe:
Hi John.
The mylar is there to give a smooth surface so you have foam, fibreglass/carbon etc then mylar.
When you are doing the layup you actually do it onto the mylar and then set the core down on the bottom mylar and place the top mylar on top making a sandwich with the wing core inside and all that goes in the vac bag. It gives a really nice smooth shiny finish like a moulded wing.
Alan_Perse:
I assume you peel the Mylar off when the resin has set?
joe:
You assume correctly Alan. Very satisfying it was too. Thankfully :D
johnfireball:
Hi Joe,
The penny has dropped. By the way does the mylar conform properly to the airfoil in all directions ie does it stretch in all directions or is it rigid and behaving as a sheet of paper would(creasing at wingtips).
Thanks John.
joe:
It's very rigid John. Think laminated business card type rigid. Leading edge to trailing edge is fine as are rounded corners like the DLG wing. It won't conform to a square tip or crease would probably just crush the corners a bit. Depends on how much vacuum you are pulling i suppose?!
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