Dart 15 Forums

There is a good article by Brian Phipps in the latest issue of DSM about single handed catamaran sailing. I don't think it is all about Sprint 15s but the majority applies to our boat. Good food for thought. (Only reservation is about the wind flow diagram which is a little dodgy)

1949

Nice to see George Love's capsize at Instow getting the National exposure it deserves

That picture just won't go away - will it? It was good fun, though.
I count myself now as something of a capsize expert - tuition offered at very reasonable rates!!!
Sail Fast - Live Slow
George Love 1825 'Fly-by-Wire'

yep sorry about the drawing, not one of mine!! dropped in by the mag. Still glad there was something in there for you.
Brian

It is a good article. Nice to see the DSM featuring the Sprint 15.
Nice shot of Paul Tanner on the wire too. Well done, Brian.

This reply is a little late but never mind. When I said the diagram was a little dodgy, I meant in terms of accuracy, regarding the statement air travels faster round the leeward side as it has further to travel

Sails work because the pressure on the leeward side is less than that on the windward side and that is because the airflow over the leeward side is faster. What is not fully understood at the moment (if my reading of books and listening to Radio4 is accurate) is actually why the airflow is faster on the leeward side. It is, however, not thought to be because it has further to travel.

But I am being unecessarily pedantic here and should shut up so I will.

Still the article was good and helpful to me - that is a fact. One statement I did not understood was downhaul attached but not powered up. I thought the object of the downhaul was to depower the sail

Robin 1949 & 1758

Hi Robin,
Always good to talk and share ideas and info. My way of thinking is the mast starts stright and the sail is cut with a curve in the luff so they do not match. When you apply down haul you force the nast to bend to the shape of the sail luff and produce maxium power by matching the two. If you then apply more down haul you bend the mast further and starve the sail of luff shape by pulling it forward and start flattening the sail and de-powering it.
You could suggest by releasing the down haul you can do the same thing and indeed Ian Fraser has done just that in a get you home situation , but to my mind if you ease down haul you will depower but the rig is a bit more power on poer off to control.

Any way something to think about I guess.
Thanks
Brian

Thanks for that Brian.

I understand the point you are trying to make. Coming from a dinghy background and sailing where boats where mast bend is governed by rig tension and other controls, I have still to get used to these tree trunk floppy rigs.

All interesting stuff though, making me want to get out there and try things. And isn't that why this sport stays fresh for so long - there's always something else to learn.

Regards

Robin 1949 & 1758