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Old 14th May 2009, 10:16 PM   #1
agrelon
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Default Fin Size

I have a question about fin size.

I sail a 125l, 75cm wide board with a 49cm fin. Only once I really get speed, the board sort of takes off and I believe the fin maybe to big for planing conditions.

Also, I'm very lightweight. 54kg with harness. Would a smaller fin give me more control at higher speeds?

Thanks.
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Old 14th May 2009, 10:17 PM   #2
agrelon
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An when i say take off i dont just mean planing i mean lift off.
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Old 15th May 2009, 01:16 AM   #3
PG
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Yes, the fin is probably too big (but it depends somewhat on the board type as well).

I guess that with your weight you typically use sails no bigger than 6.5 m2. If so, then a 40 cm fin ought to be plenty. Depending on what board it is you may even be able to shave off a few cm off that.

Based on almost "no background info" I would say get a 40 cm second fin and things will look a lot better.
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Old 15th May 2009, 10:08 PM   #4
agrelon
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Originally Posted by PG View Post
Yes, the fin is probably too big (but it depends somewhat on the board type as well).

I guess that with your weight you typically use sails no bigger than 6.5 m2. If so, then a 40 cm fin ought to be plenty. Depending on what board it is you may even be able to shave off a few cm off that.

Based on almost "no background info" I would say get a 40 cm second fin and things will look a lot better.
Sorry for the lack of precision. The board is an AHD 2005 limited edition planing oriented board. http://www.a-h-d.com/boards/windsurf...mited-edition/

74 cm wide, very flat.

You're right about the sail, my biggest sail is 6.0m at the moment. I think that because the board is so flat and wide, it has a tendency to lift off and therefore that is why it has such a large fin at the moment. (not my board, a friend's I'm borrowing)
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Old 15th May 2009, 10:44 PM   #5
Ken
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Given your size, your board would be great for light winds with 7.5 -8.5 sail in under 15 knots.

It's way too big for anything over 15 knots. Yes a smaller fin would help (40cm), but the board is the problem. As I recall, the AHD's have very hard rails, flat bottoms, pretty light and fragile. They are somewhat challenging to jibe.

If you are using a 6.0 in say: 14 - 20 knots, you should be on a board around 90 liters or smaller.
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Old 16th May 2009, 10:11 AM   #6
agrelon
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Default Board SIze

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Originally Posted by Ken View Post
Given your size, your board would be great for light winds with 7.5 -8.5 sail in under 15 knots.

It's way too big for anything over 15 knots. Yes a smaller fin would help (40cm), but the board is the problem. As I recall, the AHD's have very hard rails, flat bottoms, pretty light and fragile. They are somewhat challenging to jibe.

If you are using a 6.0 in say: 14 - 20 knots, you should be on a board around 90 liters or smaller.
Yeah, once I start really going fast the board becomes uncontrollable, (and for some reason really hard to get into the foot straps without the whole board carving upwind ) At the moment I'm just wondering whether my skills are good enough for a smaller board.. I can beach start, water start, quick tack, use harness / footstraps and occasionally jibe, but I've never tried a board smaller than 115l...

I'm looking at this second hand board which is 120l but much thinner, something like in the 50cms, and f***ing light weight. I think that this would handle speed much better due to the smaller width, and therefore less lift, easier to steer etc. What do you think?

Thanks.
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Old 17th May 2009, 06:39 AM   #7
COACHG
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The LTD you are sailing is a remake of the earlier AHD Freediamonds. They had a big single concave up front washing into a fair amount of vee in the back. Very soft, tucked rails. Those boards were smooth, soft riding and easy to jibe. I have the 2000 Freediamond 65, which is the 115 liter version. At my weight, around 75 kilos, a 6.0 is about the smallest size sail the 115 liter board will take. Maybe squeeze a 5.5 on a flat water day and no bigger then a 42 cm fin. So at your weight with the same board that is 10 liters bigger with a 6.0? Way to big fin and too much wind.

By the way, I can easily uphaul my 115, so you should be able to go smaller at your weight.

Coachg
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Old 18th May 2009, 04:27 PM   #8
agrelon
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Originally Posted by COACHG View Post
The LTD you are sailing is a remake of the earlier AHD Freediamonds. They had a big single concave up front washing into a fair amount of vee in the back. Very soft, tucked rails. Those boards were smooth, soft riding and easy to jibe. I have the 2000 Freediamond 65, which is the 115 liter version. At my weight, around 75 kilos, a 6.0 is about the smallest size sail the 115 liter board will take. Maybe squeeze a 5.5 on a flat water day and no bigger then a 42 cm fin. So at your weight with the same board that is 10 liters bigger with a 6.0? Way to big fin and too much wind.

By the way, I can easily uphaul my 115, so you should be able to go smaller at your weight.

Coachg
Yeah, I'm looking into a smaller board. Still 120l, but much thinner, (59cm I believe) again it's not perfect but it'll handle speed better i reckon due to the thinner profile. It's a really old board and if I buy it the guy is selling for 60 USD... so yeah it's old, but it is f***ing light weight and thin and slightly less volume so it'll be fast and definitely good training before I get a proper board.



Oh yeah and it doesnt have a fin yet but i reckon I'm gonna put something small on it to make it really fast and because it isn't wide at all. probably around < 40cm
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Old 20th May 2009, 12:07 AM   #9
Ken
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I weigh 79 kg and for me, 100 liters is the line between a sinker and floater board. At 54 kg, uphauling a 100 - 120 liter board should be easy. More challenging between 85 and 100 liters, but doable if the water isn't too rough.

No reason not to get a smaller board (85-100 liters) if you can water start. This is where a 6 meter sail will do you the most good.

A 120 liter board for you is still a light wind (10-15 knots) board with a 7.5 or 8.5 sail.
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Old 22nd May 2009, 09:20 PM   #10
agrelon
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Quote:
Originally Posted by Ken View Post
I weigh 79 kg and for me, 100 liters is the line between a sinker and floater board. At 54 kg, uphauling a 100 - 120 liter board should be easy. More challenging between 85 and 100 liters, but doable if the water isn't too rough.

No reason not to get a smaller board (85-100 liters) if you can water start. This is where a 6 meter sail will do you the most good.

A 120 liter board for you is still a light wind (10-15 knots) board with a 7.5 or 8.5 sail.
Ok, thanks, I'm still gonna try the 120, cause it's really thin and i've never tried a board thinner than 60cm, and if that goes well i'll definately try to find a smaller board. thanks for the advice!
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