Harry, steel boats are designed so that all curves are either cones or cylinders or parts thereof. If you have to do this in future, it might be worth seeing what naval architects use in the way of software or standard formulae. Having seen round a naval design office, it looks quite tricky to me. alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx www.alanstepney.info Model Engineering, Steam Engine, and Railway technical pages. ----- Original Message ----- From: "Harry Wade" <hww@xxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Friday, November 26, 2004 4:53 PM Subject: [modeleng] Is the List Working At 04:30 PM 11/26/04 -0000, you wrote: >I reckon everyone has been busy, that is all. - Alan I've been busy. . . . . wrestling with sheet metal "development" layout techniques, for cones in general, a fustrum of an offset right cone specifically, attempting to generate the tapered transition section of cleading (wrapper) for an American style "wagon top" boiler. It's not the easiest thing I've tried to learn but I believe I have it done. Regards, Harry Wade Nashville Tennessee MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.