Hi

I am having a problem with cutting pink foam. I have cut before white foam and blue HD foam. I assume pink and blue are same.

Conditions are as follows:

Hot wire ctter
50" bow
DC power supply
.020 SS wire
Automatic feed (gravity system)
1/16" aircraft ply templates

Foam:
3" High density pink (polystyrene)
47.5 long (span)
9.5" wide (chord)

Wing
47.5" span
1.035 thick

My problem is the core and blanks all take on a bannana sghape after removing weights, and there is a fair bit of stress when I straighten out.

Any thoughts, I have attached pictures[img][/img]


9.5" chord
0 degrees dihedral