Perhaps not a flagpole, more of a lamp post is needed?

Graham, thanks for that, re. mast. It sounds like it may need a good helping of luck to find the right thing. Yours sounds perfect. One problem I may have is that where we live, the last few miles are single track roads with grass growing up the middle. We can't get big trucks down here so it may be difficult getting something delivered in one piece.

I'll give David a shout and see if he has any more ideas. We met up in Scotland a few years ago when we did some testing with Alan Boswell of the differences between Weaverbird and my conventional rigged boat Calisto

Hi Paul.

Thanks for your input. I was thinking of using Newport sailcloth, from Kayospruce. I have an account with them so can get 50% discount. I think the biggest stumbling block will be the mast, I have limited funds and the price of even straight round tubing is scary, never mind tapered!

Thanks for the Rhino info. I have used Rhino quite a bit in the past but now I tend to focus on Fusion for my 3D printing. I'll have another look at Rhino, but I'm afraid there aren't enough hours in the day recently. At least I'm never bored!

Hi Andrew,

nice to follow up on your project. Thanks for sharing!

Just a thought: did you consider using UV-resistant cloths instead of sailcloth? We used Swela Outgard (190 g/m²) for Ilvy, and are very happy with it. She wears a cambered junk rig about your planned size, 35 m², and sailshape. The sail was also designed by Arne, and is a direct copy of Boudicca.

Ilvy's mast is 180 mm at the partners, tapered alu. I got Nedal to sell me the raw tube of a flag mast. However, I'm located in Germany, not the UK... For me, the mast was definitely the bottleneck of the whole conversion project.

Cheers,

Paul

PS: Rhino is superb at free form CAD, and comes with native calculation of geometrical centers.

Arne, thank you, that looks superb. Would you mind telling me how you mathematically calculate CLR and CE. The only thing I can find in the books is balancing bits of card on a knife edge!

I've been practising surface modelling for a few days with Fusion 360 and have nearly finished a spoon! The hull will be the next step, so I should have a 3d model soon, which I can then 3D print!