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11th March 2010 04:01 PM
agrelon
Quote:
Originally Posted by Jean-Marc View Post
Agrelon,

The more I think of your 36 cm fin, the more I find it way too large with a 5.8 sail when overpowered in 6-7 Bft for your 54 kg rider weight.

For illustrative purpose, this is what I'm using with a 5.4 sail in well to over-powered up 20-25 knots of wind (all 4 footstraps outboard and back):
-Hypersonic 105 (77 cm max width/54 cm width OFO): 26 cm slalom fin. A 32 cm slalom fin is too large.
-Carve 111 (63 cm max width/40 cm width OFO): 26 cm slalom fin. A 32 cm freeride fin is too large.
-Kombat 86 (59 cm max width/39 cm width OFO): 24 cm wave fin. A 30 cm freeride fin is too large.

BTW, I'm on Acid 62 + 4.7 m2 wave sail + 20 cm fin in true 6-7 Bft (25-30 knots wind). The stronger the wind, the smallest the gear should be picked up for a light weight rider to still be in 100% control when fully lit in choppy seas. The Carve 111 is for sure too big with a 4.7 sail for me whereas the Kombat 86 is still barely manageable with a 4.2 sail up to 7-8 Bft (2 front straps inboard and front; single rear strap centered and front. All 4 footstraps outboard and back was just impossible to keep sailing the board trimmed flat & fast).

Cheers !

JM
Thanks JM for this answer.

Indeed, a while ago on this forum I was recommended to use super small boards (60-70l) at my weight in high-winds. The problem with my spot (Hong Kong) is that the wind is extremely unstable and gusty. In order to get to a more stable windline, I have to exit the bay and then it's full open water. I much prefer this as the wind is much more stable and you can launch off some great breaking swell.

I've been caught out once or twice even outside of the bay where the wind has dropped to less than planning conditions which is why I'm not opting for anything smaller than 95l for the moment.

I've gotten a 32cm fin for my board which is 63cm wide and when nicely powered up the board is perfectly balanced with the outboard straps, no need to dig my heels in to keep the board flat. I have yet to try this fin out in over powered conditions, but for the moment it's much better than the 36cm.

Thanks for your advice.
11th March 2010 06:16 AM
Jean-Marc Agrelon,

The more I think of your 36 cm fin, the more I find it way too large with a 5.8 sail when overpowered in 6-7 Bft for your 54 kg rider weight.

For illustrative purpose, this is what I'm using with a 5.4 sail in well to over-powered up 20-25 knots of wind (all 4 footstraps outboard and back):
-Hypersonic 105 (77 cm max width/54 cm width OFO): 26 cm slalom fin. A 32 cm slalom fin is too large.
-Carve 111 (63 cm max width/40 cm width OFO): 26 cm slalom fin. A 32 cm freeride fin is too large.
-Kombat 86 (59 cm max width/39 cm width OFO): 24 cm wave fin. A 30 cm freeride fin is too large.

BTW, I'm on Acid 62 + 4.7 m2 wave sail + 20 cm fin in true 6-7 Bft (25-30 knots wind). The stronger the wind, the smallest the gear should be picked up for a light weight rider to still be in 100% control when fully lit in choppy seas. The Carve 111 is for sure too big with a 4.7 sail for me whereas the Kombat 86 is still barely manageable with a 4.2 sail up to 7-8 Bft (2 front straps inboard and front; single rear strap centered and front. All 4 footstraps outboard and back was just impossible to keep sailing the board trimmed flat & fast).

Cheers !

JM
7th March 2010 09:39 AM
agrelon
Quote:
Originally Posted by Jean-Marc View Post
Agrelon,

I find that for your XS weight, a 36 cm fin is way too large with a 5.8 sail.

Never run that JP but I did use a Starboard Carve 111 with her stock 32 cm fin and a 5.4 m2 sail but the stock fin was way too large. A 26 cm slalom fin was a perfect setup up to 25 knots for my 65 kg, so I surmise the same should be fine with your 54 kg as well. A 36 cm fin was recommended for a 7.4 m2 sail on the Carve 111 BTW, so I'm pretty sure there is something wrong with your fin sizing setup.

Cheers!

JM
High JM, yeah I think so too. Even with the straps completely outboard I had to dig my heels in to keep the board flat. Also, I couldn't initiate carve jibes which was really strange.. but according to the Select-Hydrofoil website that is one symptom of having a too large fin.

I'm trying a 32cm today, I think it should be much better.Just put side by side, my 36cm and the 32cm seem to have an even bigger difference in size than 4cm, and the 32cm is much lighter. I'll post back on how this setup works.

Cheers.
7th March 2010 05:32 AM
Jean-Marc Agrelon,

I find that for your XS weight, a 36 cm fin is way too large with a 5.8 sail.

Never run that JP but I did use a Starboard Carve 111 with her stock 32 cm fin and a 5.4 m2 sail but the stock fin was way too large. A 26 cm slalom fin was a perfect setup up to 25 knots for my 65 kg, so I surmise the same should be fine with your 54 kg as well. A 36 cm fin was recommended for a 7.4 m2 sail on the Carve 111 BTW, so I'm pretty sure there is something wrong with your fin sizing setup.

Cheers!

JM
28th February 2010 11:43 AM
agrelon
Quote:
Originally Posted by Unregistered View Post
if you already have an AHD 106, did you buy the JP for speed or ??
Bought it because I was looking for a better board. The AHD was not wood construction, quite long and heavier. It only took one run on the JP for me to be sold. The JP is definitely faster as well, to plane and top speed.
27th February 2010 07:13 PM
Unregistered if you already have an AHD 106, did you buy the JP for speed or ??
27th February 2010 11:24 AM
agrelon
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.
26th February 2010 11:35 PM
sergio_k 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
26th February 2010 07:17 PM
agrelon
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.
26th February 2010 06:16 PM
Unregistered iago - my thoughts exactly

what about Futura or iSonic ??
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