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Advice for planing through lulls?
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dllee



Joined: 03 Jul 2009
Posts: 5008
Location: East Bay

PostPosted: Mon Mar 15, 2021 4:46 pm    Post subject: Reply with quote

Makes perfect sense, when you're zipping along and run into a header that is LIGHTER than before, to hold the same course and pray to God you will blow right thru at speed.
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westender



Joined: 02 Aug 2007
Posts: 1270
Location: Portland / Gorge

PostPosted: Mon Mar 15, 2021 8:42 pm    Post subject: Reply with quote

Most people wait for the wind dummys to get going good before they go out, if they can't look out there and decide for themselves. You're on big gear anyway so at least you won't fall in ????
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DanWeiss



Joined: 24 Jun 2008
Posts: 2290
Location: Connecticut, USA

PostPosted: Tue Mar 16, 2021 12:12 am    Post subject: Reply with quote

konajoe wrote:
Changes in wind speed always result in a change in wind direction, as far as a sail is concerned. Do the vector math. Any drop in wind speed results in an apparent wind direction that is coming more from the nose of the board. (A sudden drop to 0 will always make the apparent wind come directly from the nose.) So immediately after a lull hits, your sail should be more sheeted in than it was a second before the lull hit.


I think you are mostly right. Assuming a true beam reach, whether the apparent wind moves forward if the true wind drops to next to nothing, of course, but otherwise is entirely dependent on the difference between board speed and true wind speed. Sometimes a board sails at so close to the planing threshold that a small lull brings the board off a plane, in which case the apparent wind swings aft before the board is no longer planing.

Planing upwind on a beat also means a lull swings apparent wind aft.

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konajoe



Joined: 28 Feb 2010
Posts: 517

PostPosted: Tue Mar 16, 2021 9:13 am    Post subject: Reply with quote

dllee wrote:
Well, don't bother to heed your own advice.
You said lulls cause a slight headwind. So holding course just makes you head upwind higher, which automatically SLOW you down in the lighter wind


I'm trying to understand what you're saying. Again, when you do the vector math, you find out that every change in wind speed or board speed results in a change in apparent wind direction, the wind direction you feel while standing on the board.

So when you sail a compass point with variable wind from a constant direction, you should be sheeting in and out as your speed and the wind speed changes. People don't call those moves heading up or bearing off.
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PeconicPuffin



Joined: 07 Jun 2004
Posts: 1807

PostPosted: Tue Mar 16, 2021 11:10 am    Post subject: Reply with quote

konajoe wrote:
So when you sail a compass point with variable wind from a constant direction, you should be sheeting in and out as your speed and the wind speed changes.


Exactly. It's about subtle adjustments to sail trim, and one can (subtlely) roll their weight forward a bit to keep board trim right.

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dllee



Joined: 03 Jul 2009
Posts: 5008
Location: East Bay

PostPosted: Tue Mar 16, 2021 12:00 pm    Post subject: Reply with quote

When wind drops, change of course is needed.
When wind changes direction, change of course is needed.
So when wind drops, and wind changes direction, do you hold the same course?
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dllee



Joined: 03 Jul 2009
Posts: 5008
Location: East Bay

PostPosted: Tue Mar 16, 2021 12:00 pm    Post subject: Reply with quote

When wind drops, change of course is needed.
When wind changes direction, change of course is needed.
So when wind drops, and wind changes direction, do you hold the same course?
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PeconicPuffin



Joined: 07 Jun 2004
Posts: 1807

PostPosted: Tue Mar 16, 2021 3:03 pm    Post subject: Reply with quote

dllee wrote:
When wind drops, change of course is needed.

No. That's silly. The wind strength changes all the time. If that was true nobody would be sailing back to their launch. Sheeting angle and stance subtly change to accommodate wind drops.

dllee wrote:
When wind changes direction, change of course is needed.

For beam reaching, by definition yes. To get to a specific point, close or broad reaching may be called for.

dllee wrote:
So when wind drops, and wind changes direction, do you hold the same course?


I sail back to the launch (on what would have been a beam reach but now is either close or broad) and rig a bigger sail.

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dllee



Joined: 03 Jul 2009
Posts: 5008
Location: East Bay

PostPosted: Tue Mar 16, 2021 3:34 pm    Post subject: Reply with quote

Once you get good at windsurfing, and not until then, you ill see the wisdom of my words.
I AM good at sailing bach and forth.
You will be too, in time.
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jingebritsen



Joined: 21 Aug 2002
Posts: 3350

PostPosted: Wed Mar 17, 2021 1:58 am    Post subject: Reply with quote

Florida has notoriously Swiss cheese kind of wind. my solution is gear choice. rig big. also jibe in the gusts. here on the east coast, on westerly, flat water days, those that keep an eye on who is planing and who is not, and corner to stay in the ribbon of wind they are in, fare better too.

so when it's 15 to 28mph, i tend to rig 6.2 or 6.8 and will mitigate the chop with a 105 liter and a 30cm fin. others seem to think that a 5.2 might be better. they slog, i don't. provided i corner in the gusts, i rarely stop planing. some days like this i may also opt for a 94 liter, depends on how hollow the lulls are.

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