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problems steering downwind

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Created by OceanBlue64 > 9 months ago, 4 May 2008
OceanBlue64
VIC, 980 posts
4 May 2008 9:33PM
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Today I was playing on my 95L Sonic in conditions that were a little light (about 15kts) and found that as the gusts eased a little, the board kept rounding up.
I was also having a few issues steering downwind even when I was planing. I moved the mast foot forward a little and it helped slightly. As this is only about the 4th time I have used this smaller board, I dare say my technique is not quite right.
I tried 'scissoring' my feet to try to steer but didn't have a lot of success.
Maybe I have too much back foot pressure?

Any pointers would be greatly appreciated.

Gestalt
QLD, 14984 posts
4 May 2008 9:38PM
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it could be your boom is too low and you are not driving through the rig?

OceanBlue64
VIC, 980 posts
4 May 2008 9:43PM
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I actually have the boom set reasonably high.. well high for me cos I am a short a@@. Its set about nose level, maybe a little higher.
But yeah I may not be driving through the rig though. Its a big change from the larger Go so am still trying to get used it not being as stable.
Did manage to do my first deep water start today so I am happy with that, but will be getting a PFD to make it a little easier. Took me ages to get the sail in the right position though.

Gestalt
QLD, 14984 posts
4 May 2008 9:46PM
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yep that's a good height for light winds.

was your back leg bent and front leg straight?

decrepit
WA, 12889 posts
4 May 2008 7:53PM
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Are you talking planning or non planning??

But general theory is, that as board slows down it sinks into the water, engaging more rail forward.
This also shifts the center of lateral resistance forward, tending to turn you upwind, to counteract this, the center of effort also has to move forward, (don't rake the sail back as far), or weight has to move back a bit to shift CLR back again, (if you're underpowered this isn't a good idea, as it could really slow you down.)

OceanBlue64
VIC, 980 posts
4 May 2008 9:54PM
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Gestalt said...


was your back leg bent and front leg straight?


Yeah and I was trying to get up on toes as well cos I heard that helps taking the weight off the feet and putting more on the rig. Well at least thats what I was attempting anyway lol.
Maybe I just need more time and practice on the water.

OceanBlue64
VIC, 980 posts
4 May 2008 9:57PM
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decrepit said...

Are you talking planning or non planning??




Well I was planning but it was as the wind dropped and I came off the plane a little. I know the board is probably a little small for the conditions but I wanted to get used to it before I use it in real strong winds.
The problems steering downwind were when it was planning.

Gestalt
QLD, 14984 posts
4 May 2008 10:17PM
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it's hard to tell without watching.

but i think decrepit is on the right track.

maybe you are leaning towards the tail of the board. this gives the impression of raking the sail back but is really just sinking the tail.
It usually results in the sail not being held vertically as well.

as you are planing and you rake the sail back swing your body weight forward. ie. try to look around the front of the mast.

of course always keep your head pointing where you want to go. i was always taught that in light winds, your body weight is not forward enough unless you can almost see around the front of the mast.



decrepit
WA, 12889 posts
4 May 2008 8:18PM
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Once a smaller board starts planning it becomes very responsive to foot steering, as the power comes off, the harness doesn't support as much of your weight and you tend to sink the windward rail, this turns the board upwind. It's your ankles that are controlling board direction in this case. It's always more efficient to keep the board flat or leeward rail down slightly.

OceanBlue64
VIC, 980 posts
4 May 2008 10:44PM
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Thanks for all that info. Hopefully we will have some wind next weekend so I can try a few things.

Just a quick question about 'rails'. I see lots of descriptions on boards with 'hard' rails etc. Is a soft rail when its is rounded off and a hard rail when it goes to a hard edge? What effect does the different shapes have?

Sorry if the questions are a bit basic but I want to get my head around the technical aspects of how the boards work.

decrepit
WA, 12889 posts
4 May 2008 9:03PM
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OceanBlue64 said...

Is a soft rail when its is rounded off and a hard rail when it goes to a hard edge? What effect does the different shapes have?



Yep, soft = round, hard = square, especially the bottom edge.

Basically for most purposes you want hard rails at the back for speed.
On trailing edges soft rails create "suck" (negative lift).

Mid to forward rails are better soft for ease of handling, earlier slalom boards had hard rails every where and made them very unforgiving down wind in chop at speed, the forward rail catches the chop in even the smallest spin out, the rail will dig and the board will turn over, sending rider into a catapult. Also gybing is much harder, for a similar reason, the forward rail digs in causing the board to go in a straight line, if you're leaning out, splasho.

mineral1
WA, 4564 posts
4 May 2008 9:03PM
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Thanks for that JB, am just completing second season, and was just at that point of wondering, whats the next step. Have it now

Gestalt
QLD, 14984 posts
4 May 2008 11:07PM
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mineral1 said...



Thanks for that JB, am just completing second season, and was just at that point of wondering, whats the next step. Have it now


some more light reading then?

carbonsugar.com/

mr love
VIC, 2426 posts
5 May 2008 11:19AM
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If it,s trying to round up while you are planing move the mast foot back !!! or set the boom higher .

mkseven
QLD, 2315 posts
5 May 2008 11:30AM
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15knots... on a sonic 95... seems just a little light to be comfortably pushing a narrowish board off the wind. Did things become a bit more comfortable in the gusts?

P.C_simpson
WA, 1492 posts
5 May 2008 12:34PM
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dude for freeride sailing , your boom should only be shoulder hight at max, any higher and you start to lose control,and you will have to rake the rig back to get in a comfy position. with a high boom as soon as you hit a hole in the wind and your hooked in you will be struggling to get inboard and out of the harness line, ie weight over the rail making you carve up wind..

555
892 posts
5 May 2008 12:59PM
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P.C_simpson said...

dude for freeride sailing , your boom should only be shoulder hight at max, any higher and you start to lose control.


If you're overpowered maybe... but that's VERY unlikely in 15 knots.

I'd be looking for a bigger fin and/or sail, or maybe just some more wind for the little board. Mast foot back a bit might help, but it does sound like you're pushing the envelope of sailable conditions on that kit.

Maybe keep a closer eye on the water surface indications of the wind ahead so you can anticipate the lulls a bit better, and either bear off more in advance, or pop out of the straps and move inboard in preparation.

If you suspect that you're a bit heavy on the back foot, you could try shifting the harness lines back a bit - that will unload your back arm and back leg which often helps. (good to prevent spin out too!)

OceanBlue64
VIC, 980 posts
5 May 2008 5:46PM
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mkseven said...

15knots... on a sonic 95... seems just a little light to be comfortably pushing a narrowish board off the wind. Did things become a bit more comfortable in the gusts?


In the gusts it was great. I know conditions were marginal for the board, but I wanted to get a feel for the board before I tried to use it above 20kts. Coming down from a 155lt board is a bit of a jump for me lol.

mkseven
QLD, 2315 posts
5 May 2008 6:39PM
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Cool. You need power to sail off the wind, otherwise the board gets a bit skatey and wants to turn up all the time... u can pretty much stand on your toes, sheet out a touch and ride the lull but its just easier to let the board do it's thing and round up a bit.

Easy fix, and geez keep it simple people.



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"problems steering downwind" started by OceanBlue64