Eric Raymond, who built the SunSeeker solar/electric motor glider, told us about constructing his boom which he laid up over a light pole in carbon fiber, at the recent Tehachapi esoaring workshop. He had this all heated up in a long box oven and when it was cured, he got the bright idea to hose some cold water down the inside to shrink the AL tube and pull off the carbon tube. Well, when he did this, the assembly bent in a bow shape and he thought all was lost. But everything straightened out after a while and his boom flies happily ever after.