I'm gonna guess fiberglass
Give the man a cigar!
It's laminated FPR, fiberglass reinforced plastic. I was trying to get piano key overlays, but didn't score.
The downside, is that I was trying to take photos of the bow with full draw and now the tiller looks drastically different. Both limbs hinge right at the fades. Yeah, I know..I know! This is what happens when you use
EFFING-GLASS ON A PRIMITIVE BOW.I talked with iowabow about it this afternoon and he suggested I heat treat both fade outs, adding 2 inches of set-back to the handle, and try taking a very few light strokes off mid-limb to bring it back to an ellipse.