Mast, mast, mast!

Windsurf equipment based chatter should be in here.
TOTD
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Re: Mast, mast, mast!

Post by TOTD » Fri Sep 13, 2019 4:56 pm

This is good analogy by a premier sail maker.

Think of mast stiffness like the skeleton in an animal. The bigger the animal, the stiffer the bones must be. To take an extreme example, you can rig a 460 in a 3.7 sail, but it would be like a cat having the bones of a horse. Or, you can rig a 370 in a 5.5, but that would be like the horse having the bones of a cat. The mast must get shorter as the sails go down in size. A shorter mast is more flexible than a longer mast. Some sail companies state that they have one mast that fits all sizes, but in reality, that mast would be optimal in a few sizes, and not great in the others.
If a mast is too stiff, the sail will require more downhaul. This will move the draft further back and decrease the forward drive, while at the same time making the sail feel twitchy and slightly draft back.
If the mast is too soft, the sail will require too little downhaul, making the sail less stable.
K4 4Boards Tri Sails,and Chocolate Chip cookies
Ibuprofen, Irish Whiskey

Pad IoW
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Re: Mast, mast, mast!

Post by Pad IoW » Sat Sep 14, 2019 9:27 am

TOTD wrote:
Fri Sep 13, 2019 3:37 pm
The sails come in sizes to suit a weight, which suits a size board, which suits a wind force, which is a dynamic it changes.
....
Not true really. Take a 5.2, rigged on a 4m mast, a 65kg sailor sail nicely powered. The sail, mast combo make the sail a certain shape. The wind increases, & a 95kg sailor borrows the rig, & finds he is nicely powered. However the rig will be a different shape as it is loaded by an extra 20 kg. It still works tho. To get the rig to match the lighter sailor, the heavier sailor would have to swap for a stiffer 4m mast.

Our 5.2 m sail is designed to work with various wing loadings, which I guess isn't a bad thing, (but is a compromise) but it could be designs for a specific loading, which you could alter with a softer, stiffer mast.

Pad IoW
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Re: Mast, mast, mast!

Post by Pad IoW » Sat Sep 14, 2019 9:29 am

Richarli wrote:
Fri Sep 13, 2019 4:38 pm
Might be an idea to email Matthew at 5 Oceans and ask him about making you a custom set to suit one mast. It'll probably be cheaper as well.
Is probably the answer.

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