Originally Posted by johannlochner
Then there is the warping and twisting issues too...
In my rather lengthy discussions with Evan on the subject, specifically around wing moulds, Warp occurs if you are introducing different materials to the layup, like sand, metal bars etc... His recommendation to me was to use "returns" made of the same material as the mould layup. This gives the strength without the warp.
Of course this means nothing when you are building a mould for inflation bladder moulding, since you have to reinforce for internal pressure and hence external clamping force.
Good luck, I'm glad my fuse is long and skinny.