Thanks, guys! I've never posted on this thread before because it's for JetJoe OWNERS and there is no way that I would EVER be one of them.
However, I've always followed the thread and this seemed to be a sensible bit of discussion between knowledgeable people so I thought I'd add to it. Mark, you are certainly right about the area-ruling - in the days when the MW44 had a two part cone (the only one it would run with) the guys would be there with calipers and calculators, measuring, mixing and matching tailcone inners and outers to get the best permutations. There were always some left over, it was very time-consuming and uneconomical, so it was a relief when Mike Murphy developed the engine to a stage where it would take the machined one-piece cone.

Sara Parish
Wren Turbines