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Sailboarder
Joined: 10 Apr 2011 Posts: 656
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Posted: Thu Nov 27, 2014 10:49 am Post subject: |
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In flatter water, it would be K1 and 7.5, My next step down would be 6.0, and I would find it tight for the average wind. I prefer to be over than under and I'm 215 lbs too. |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Thu Nov 27, 2014 11:03 am Post subject: |
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Even at 215 (I've weighed 205), a 7.5 when it's averaging 32 would be unmanageable at Arlington and fatal at the Hatchery. (30 by Arlington's sensor = roughly 22 by Swell's sensor; location is everything). I gotta wonder how your sensor compares. There's some spray flying off the tops of the bumps when it's blowing 32 at the Hatch. |
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adywind
Joined: 08 Jan 2012 Posts: 665
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Posted: Thu Nov 27, 2014 11:54 am Post subject: |
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Oops, are we talking MPH or KN? If it's KN I'm off. |
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westender
Joined: 02 Aug 2007 Posts: 1288 Location: Portland / Gorge
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Posted: Thu Nov 27, 2014 12:28 pm Post subject: |
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So hard to say without seeing the water for myself. Using the 16-32 mph,, I could be on anything from 3.9 to 5.7 depending. |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Thu Nov 27, 2014 3:27 pm Post subject: |
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adywind wrote: | Oops, are we talking MPH or KN? If it's KN I'm off. |
I'm talking mph, but at 16-32 the distinction is moot. |
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joethewindsufa
Joined: 10 Oct 2010 Posts: 1190 Location: Montréal
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Posted: Thu Nov 27, 2014 7:45 pm Post subject: |
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actually if it is 16-32 mph i would change my answer to NorthSails Duke 6.9 using 460 RDM mast on my Mistral Equipe I longboard. still 230 pounds though - NO change there NEVER tried my 6.3 on the longboard (and don't have a 7.5)
16mph = 14 knots
32 mph = 27 knots
for me the difference between 27 knots and 32 knots IS significant !!
and as posted later the difference between 14 and 16 knots may mean NO planing as opposed to planing
Last edited by joethewindsufa on Sat Nov 29, 2014 9:12 am; edited 1 time in total |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Fri Nov 28, 2014 9:13 am Post subject: |
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On paper, and when it's steady, and when it's accurate, the 15% speed difference between kts and mph* may matter. But in the real world, where the wind is gusting and changing all over the place even without waves blocking the wind on the foot of the sail and the sensor is on land somewhere else and affected by terrain, my hat's off to anyone good enough to feel the 15% difference. And that's not even counting any disparity in John's assessment of his 16 or his 32.
* The comparison was between 32 mph and 32 kts, not 32 kts and 27 kts.
Either way, John's question addresses a power range of 4:1, which pretty much swamps (by a factor of 3) the 1.3:1 power ratio between kts and mph for me. |
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carl
Joined: 25 Feb 1997 Posts: 2674 Location: SF bay area
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Posted: Fri Nov 28, 2014 11:39 am Post subject: |
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The 15% makes a huge difference for planing in the low end, especially if you're sailing small enough kit to handle the upper end gusts of 27 or 32.
Most sailors need big kit to plane in 16mph but most can plane with much smaller kit in 18.4mph.
The OP is just not giving us enough info to answer the question. |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Fri Nov 28, 2014 12:45 pm Post subject: |
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Oh, I dunno ... it's his question.
And he's no doubt deliberately being vague, because a) it's hypothetical, b) the next day (or session or reach) may be 14 to 28 or 18 to 34 or just plain 10, and c ) his 20 may be the next site's 15 or 25. I think he's just throwing out some guesstimated typical day in his hood and asking what we might use in generally similar conditions.
I know I might rig anything from a lawn chair (for the sub-20 part) to a 6.2 + 90 liters (if it spent much time in the low 20s) to a 5.2 and 80 liters (if it was a warm day, some nice swell or waves, and spent enough time in the upper 20s). That, of course, depends on the wind shadow, the current, the forecast, the water temps, how fresh I am, what gear I took that day if I drove my OB rather than my MoHo, how late in the day it is, whether I wanted to go way up or down wind, the crowds, and more.
His 16-32 criterion is much simpler. |
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Sailboarder
Joined: 10 Apr 2011 Posts: 656
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Posted: Fri Nov 28, 2014 1:22 pm Post subject: |
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isobars wrote: | Even at 215 (I've weighed 205), a 7.5 when it's averaging 32 would be unmanageable at Arlington and fatal at the Hatchery. (30 by Arlington's sensor = roughly 22 by Swell's sensor; location is everything). I gotta wonder how your sensor compares. There's some spray flying off the tops of the bumps when it's blowing 32 at the Hatch. |
I'm confident the sensor is calibrated, and exposed to very similar winds I experience since it's not to high, not far and on the end of a wavebreaker. I fully agree that it would be hard to handle 28 kts average with my 7.5. However, the water is quite flat at that spot when it's around 20 kts. I handled there sustained gusts of 28 kts with the 7.5 and 40 cm fin. Since the water was flattish to start with, the acceleration is huge and the challenge is not to handle the sail but to handle the fin.
With regard to another post you are right that 15% is not a big number, and I cannot myself evaluate and forecast wind with that accuracy. However, I would also say that I can plane at that spot with a sail in 15 kts, and I'm off the plane at 14 or so. It doesn't take a big difference to have a nice, or a not so nice session. It's a bit useless to know that because I can only look at the chart afterwards, but cannot predict what will be going on in 5 minutes. |
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