I just tried the mast calcs using Wine on Linux[1]. There seems to be a handy Wine bundle for Mac as well, I'd recommend checking out http://wiki.winehq.org/WineBottler.

Some members may be familiar with the hull design program ‘DelftShip’, which is very useful for creating 3D hull/superstructure designs, and producing developed panel patterns assuming the hull has developable surfaces, as in the case of hard chine hulls.

I have also found it useful for evaluating sail designs, permitting 3-dimensional visualisation and checking for measurement errors, inconsistencies, etc., before committing to sailcloth. The 3D visualisations, including masts, spars and battens can be rotated, scaled and examined from all angles. It will also produce high resolution panel patterns from which measurements may be accurately and precisely made using the mouse/cursor and transferred directly to the sailcloth (I haven’t tried this yet).

I have placed an example of a DelftShip visualisation of a sail design in my profile folder as an example. Note that this is not a sail design program as such – the sail will have to be designed on paper or in a drawing program first, and the relevant measured data points then transferred to DelftShip. Note also that it’s only really useful for visualising sails made from flat panels – traditional flat sails and, as in this case, using the angled shelf foot to achieve camber. I used Slieve’s guidelines for producing these shelf foot cambered panels in PaintShop Pro. I guess sails using the ‘barrel cut’ could also be entered, but the process
would be very much more difficult, flat panel patterns would be difficult to produce, and it would probably not be worth the effort.

DelftShip is a very useful and powerful 3D hullform modelling program and is available free here. Windows 32 and 64-bit combined installer. I have found it also runs perfectly well under wine in Linux.

Sailcut 8 version : 10 May 2007 supports VanLoan style sails as well.

cheers
Juergen

Peter Manning wrote: David, I have just downloaded sailcut on my mac using igetter (I think) Don't know if this will help.

Yes, you can download it - but you can't open it on a Mac, because it's a .exe file.

Whilst browsing for something else, I came across this: