"Gramps' shop" wrote:


I'll use two or three at about 18 inches in height. I will wrap my
bendy wood around an arc on each to stabilize the form of the base I
am making. Will adhere wood to concrete form with appropriate
adhesive (hoping TB II is appropriate). The base I am making will be
about 45 inches in length by 8 inches in width by 20 inches high. It
will be in the shape of an elipse.
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So what you are telling us is that you need an 8" dia mandrel.

Take a look at an 8", 10 ga, piece of PVC pipe.

It won't degrade like a son-o-tube, but will require epoxy to make the
bond between bending ply and PVC.

Hit the PVC with some 24-36 grit sanding disks and you are good to go.

I used a piece of 8", 10 ga, PVC as the mandrel to lay-up a fiberglass
tube for the bow thruster I was going to install.

Lew