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Standing up in a hiking class

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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 15 at 4:13pm
Leeway is greatly misunderstood. In reality its simply the angle of attack the daggerboard is working at.

An interesting question, which I've rarely seen considered in print is, bearing in mind

i) the angle of attack on the daggerboard is going to be much the same no matter what, and

ii) most boats (especially more modern ones) are wedge shaped and pretty asymettrical when heeled

at what heel angle are you going to get the lowest hull drag, and heeled which way?

I've not actually studied the question myself, but a quick sketch makes me think that windward heel may mean the immersed hull sections are better aligned with the water flow. Its all going to depend on individual hull designs of course, but I've known boats that really seem to want a bit of windward heel upwind, and boats that seem less fussed...

An old style more symmetrical boat is going to be much less fussed which way its heeled in that respect I should think, and a very flat sterned boat will tend to just drag the corner if its heeled much anyway, so its surely very variable.

Edited by JimC - 19 Oct 15 at 4:17pm
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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 15 at 4:35pm
The very flat sterned/low rocker boats seem to have to get into some very odd positions to get going in light winds. Sliding off a B14 foredeck seems like a popular game, or was a few years ago.
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IanW View Drop Down
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Post Options Post Options   Quote IanW Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 15 at 3:26pm
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JohnJack View Drop Down
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Post Options Post Options   Quote JohnJack Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 15 at 4:27pm
Originally posted by IanW


Skill Level = Ninja
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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 15 at 4:58pm
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Oinks View Drop Down
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Post Options Post Options   Quote Oinks Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 15 at 5:47pm
Many years ago, we had a serial light wind rocker/roller in our Laser fleet. His technique, as described here, was to stand up and ever so subtly waft the rig from side to side. I had warned him quite verbally during the race but it didn't stop him. So I quietly armed myself with 3 witnesses who agreed with what I was seeing. He claimed sitting down in the boat was bad for his knees. The protest committee was done and dusted in our favour within 15 minutes. He never spoke to me again!
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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 15 at 6:24pm
I hope that somewhere I can find the picture of one of our Belgian resident Minisprint sailors doing a handstand on the seat while sailing along. Dean, do you follow y&y?
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CapSizer View Drop Down
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Post Options Post Options   Quote CapSizer Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 15 at 7:40am
Originally posted by JimC


---snip---
at what heel angle are you going to get the lowest hull drag, and heeled which way?
---snip---
I've not actually studied the question myself, but a quick sketch makes me think that windward heel may mean the immersed hull sections are better aligned with the water flow.
---snip---


Jim, I've had this discussion with somebody before.  Your description makes sense, but there is a catch, and that is that when you heel to windward, the hull's centre of buoyancy also comes to windward.  This means that your "crew centre of gravity" to hull c.o.b. lever arm is reduced, hence less sail carrying capability.  It seems to me that it is only a viable option when under-powered.  So hiking harder to heel to weather could work, but de-powering to do the same probably wouldn't.
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Chris 249 View Drop Down
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Post Options Post Options   Quote Chris 249 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Nov 15 at 11:18am
Originally posted by JohnJack

Originally posted by IanW


Skill Level = Ninja

Nope, it's honestly not that hard.  After all, if you tack a yacht, skiff or board you run around on your feet and often do it in a tightly-defined path. Running from side to side in a Canoe is pretty much the same, with the addition of a quick stop to throw the plank across.
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