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Old 8th February 2010, 01:06 PM   #1
agrelon
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Default Footstrap Position and Speed

Hi all,

I've just bought a 2006 JP Super X 106l and was blown away on my first outing by it's speed and acceleration.

I had the foot-straps in the outboard setting but only on the 3rd (out of 4) most back setting, and can therefore still move both straps about 2cm further back.

Does moving the straps further back generally increase maximum speed?

I would have imagined so as there would be more lift on the front of the board and less wetted surface area....

Any comments?
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Old 8th February 2010, 11:43 PM   #2
mac33
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at your weight 54kg, moving straps to very back position would produce too much board lift, especially in stronger wind. i am another 12kg heavier, i have my backstraps as far forward as possible.

this helps to stop the board from taking off in gusts.

ask different sailors and some will say moving straps back is faster, a few will say moving straps forward is faster.

at my 66kg i try to reduce the lift of board as much as possible.

straps forward,weight in harness forward to nose, smaller fin,lower boom and high hook height all help.

a 5.8m at 54kg is quite large. a 4m + 5m will be faster for you if the wind is decent.
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Old 9th February 2010, 10:36 AM   #3
agrelon
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Thanks for your advice. I think the same sort of thinking applies for mast track position... further back = more speed but less control due to more lift.

I had a 5.3m until 3 days ago when it got stolen from the place I stored it on the beach... So I'm with a one board and one sail for the moment. I do have a smaller fin though, which I can stick on my board if the wind really picks up to help me gain as much control as possible.
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Old 9th February 2010, 05:28 PM   #4
Farlo
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JP SX106 has not much power in tail, and is not the most stable in its category. IMHO you will gain very little speed (if any) by moving the straps back. Some shapes work better globally with backward settings because you fly higher over chops. This one has a tendency to take-off already. A smaller fin will have a lot more influence on control and speed.
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Old 10th February 2010, 09:53 AM   #5
agrelon
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Quote:
Originally Posted by Farlo View Post
JP SX106 has not much power in tail, and is not the most stable in its category. IMHO you will gain very little speed (if any) by moving the straps back. Some shapes work better globally with backward settings because you fly higher over chops. This one has a tendency to take-off already. A smaller fin will have a lot more influence on control and speed.
Next time I sail I'll try using my smaller fin (~30cm), footstraps completely back and out and mast track slightly back. I think with the smaller fin I should still be able to control the increased lift and might see some gains in top end speed.

Cheers.
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Old 26th February 2010, 04:52 PM   #6
iago
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perchè parlate di tavole Jp sul sito starboard??


why talk of JP boards on the site starboard?
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Old 26th February 2010, 05:16 PM   #7
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iago - my thoughts exactly

what about Futura or iSonic ??
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Old 26th February 2010, 06:17 PM   #8
agrelon
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Quote:
Originally Posted by Unregistered View Post
iago - my thoughts exactly

what about Futura or iSonic ??
Because unfortunately I only have the money to buy second hand equipment and that a JP board was the best thing on offer. Trust me, if I could've gotten a Futura or even an S-type I would have.

As for posting on this forum, it's the best one on the internet for windsurfing info.
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Old 26th February 2010, 10:35 PM   #9
sergio_k
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I'd like to put in few more comment on foot strap positions /fin size, etc..
mine always all the way back with relativelly large fin, if you have problems/tail lifting,
you have choices: moving mast track forward, smaller or better fin, moving
foot straps forward, specially front ones (makes your stands wider),
all of those things will de-power you set-up but will give you better control,
so final result could be actually a better avg. speed,
as your tecnique improves, you'll be able to move all settings back again.

www.miamiwindsurfer.blogspot.com
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Old 27th February 2010, 10:24 AM   #10
agrelon
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Quote:
Originally Posted by sergio_k View Post
I'd like to put in few more comment on foot strap positions /fin size, etc..
mine always all the way back with relativelly large fin, if you have problems/tail lifting,
you have choices: moving mast track forward, smaller or better fin, moving
foot straps forward, specially front ones (makes your stands wider),
all of those things will de-power you set-up but will give you better control,
so final result could be actually a better avg. speed,
as your tecnique improves, you'll be able to move all settings back again.

www.miamiwindsurfer.blogspot.com
I found last time I was sailing that even with a 36cm fin for my 5.8m and bft5 wind I could keep the back end quite quiet. My mast track had slipped completely forward and my footstraps were in the 3/4 most forward position.

I had almost exactly the same straight line speed as my friend on an Exocet S-Cross with 6.3m and a 36cm fin so I'm going to try the following to gain the extra bit of speed I need to leave him behind me:

- Mast track middleish/back (and tighter so it doesn't slip forward)
- 4 cams on my sail instead of 2 ( theoretically it can be rigged 3 or 4 but taking out the top one was fine so I tried it)
- All footstraps back 1 knotch so 2nd most back position
- More outhaul (when I got back to the beach I realized mine had come slightly loose...)
- Smaller fin (I'm trying to find a 32cm fin as my 36cm is seriously impeding on my top end. Also, as the guy I'm up against has a 36cm fin and weighs more so generally has bigger sails logically I should have a smaller fin)

I think that with all this I should gain at least 3 knots in top end.
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