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 20, 2019 2:17 pm

Gorgesailor wrote:
Thu Sep 19, 2019 7:16 pm
TOTD wrote:
Thu Sep 19, 2019 2:03 pm
Mast stiffness vs. sailor’s weight:
Some people think a heavier person should use a stiffer mast and a lighter person a softer mast. This is kind of true and kind of not true. The mast stiffness must be matched to the sail size, not the person’s weight. So generally, a heavier person is using a bigger sail, so they will be on a longer and stiffer mast.
This is not quite true either. For example, if the heavier person is sailing a 5.0 in 25knot wind while the lighter person is sailing it in 15knots(extreme example) the heavier person is putting a greater load on the mast than the light person. So PadIoW is right in that way. Thing is the mast curve, & load distribution of sails of different size is & should be different so stick the same mast in a 5.0 & 4.0 is possible but not necessarily a good thing.

I like the rabbit hole , analysis, mentioned above.
Gorgesailor, I don’t understand what part of my post you missed, the part about true and kind of untrue obviously.
That passage is a reflection of some designer in Hawaii.
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Richarli
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Re: Mast, mast, mast!

Post by Richarli » Fri Sep 20, 2019 4:30 pm

I sort of get what everybody is trying to say and I think we're all heading in the right direction if not starting from the same point.
However in my personal experience I would suggest I'm using a sail in much more wind than the size and weight it was designed for. Therefore if I use the manufacturer designated mast it's going to be too soft?

TOTD
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Re: Mast, mast, mast!

Post by TOTD » Sat Sep 21, 2019 2:20 pm

Richarli wrote:
Fri Sep 20, 2019 4:30 pm
I sort of get what everybody is trying to say and I think we're all heading in the right direction if not starting from the same point.
However in my personal experience I would suggest I'm using a sail in much more wind than the size and weight it was designed for. Therefore if I use the manufacturer designated mast it's going to be too soft?
Possibly, it will be too soft. Such a determination would be difficult, I don’t know how.

If you knowingly use a large sail for winds it’s not designed for, you don’t have smaller? Such a scenario would dictate a lot of downhaul, thus a negative effect on handling, not so good.
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Richarli
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Re: Mast, mast, mast!

Post by Richarli » Sat Sep 21, 2019 4:28 pm

Sorry I didn't explain myself better. I meant me at 100kg using the sail in a higher wind strength than the 75kg sailor it was designed for.

TOTD
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Re: Mast, mast, mast!

Post by TOTD » Sun Sep 22, 2019 1:00 am

Richarli wrote:
Sat Sep 21, 2019 4:28 pm
Sorry I didn't explain myself better. I meant me at 100kg using the sail in a higher wind strength than the 75kg sailor it was designed for.
This is the best answer I came up with.


Mast stiffness vs. sailor’s weight:
Some people think a heavier person should use a stiffer mast and a lighter person a softer mast. This is kind of true and kind of not true. The mast stiffness must be matched to the sail size, not the person’s weight. So generally, a heavier person is using a bigger sail, so they will be on a longer and stiffer mast.

THe remark about lighter sailer designer for vs heavier one using it, does not compute in my mind.
I think I might have several masts that fit this sail, just in case.
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Jeroensurf
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Re: Mast, mast, mast!

Post by Jeroensurf » Sat Oct 12, 2019 8:05 am

A bit late to join the party but...
Besides the mast stiffness you have also seamshaping to deal with. The problem is that that more or less has to be in sync with the expected load tension set by the mast. That is why you only have a few cm/kg of downhaul range and often more Outhaul range. So you can,t think about the sail as indepenend thing, its always about the rig.
Because of this profile I believe that most sails/rigs have a sailor weightrange they work best with. This comes often with a diff feel of the sails/rigs and if you really like the feel most of us accept the slightly smaller windrange as compromise to keep that feel.

Within this range you can play a bit. With some Hotsails in the past was a 400 mast adviced but with my very moddest 93kg a preffered it with a 430 base and 4m top to put a bit more tension in the bottom of the sail, but a whole 430 would make the sail too stiff.

There has also been examples of weight specific sails, for example the Hot Dwag/DD was a sail that was especially made light (sub 70kg) sailors.
The 5.8 was rigged on a 400 mast and the seamshaping fitting that. My wife was back then still windsurfing and loved it. For me it was unbalanced and the Cof E allover the place. I tried it with a 430 mast and there was more wrinkle as sail left.

Back to the weight/range: right now i,m on the 2020 Ezzy ails and got a wave(the new Elite) in 5.8 and 3.7 and Taka5.3-4.7-4.1.
The Wave will be more stable and probably more suited to my weight, but because I like the soft feel of the Taka i,m happy to trade a bit of range and that I need to trim more often my sail for that feel and depowering on the wave because it suits my likings/needs.

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