That 44cm fin on your 69 wide with a 6.6 is already on the large side. You could easily go to a 7.8 or similar without having to get a bigger fin.

Mark _australia said...
24 about the largest for the wave board, but it is interesting you use that with 4.2. 24 on that board would be for 5.5 - 6.0 and the 22cm be a more alround fin (in wave use_ .................but as you are B&J ing on it you could pretty much use whatever. I'd say 20 for your smallest sail and really blowing and 22 for the 4.2

I was having trouble getting upwind so I got the 24cm and it was much better. It's also more a freeride while the 22 was a raked back wavefin.
I've been using a 18cm weedfin with the small sails ( 3.8 / 3.2) but its really chunky/ triangular. I have been having trouble getting upwind but I haven't sailed the board a lot & I was doing short runs & losing a lot of ground at each gybe.

As a rough guide for freeriding boards and sails.
Sail size x 6 ie:

4.4m x 6 = 26.4
6.6m x 6 = 39.6

and so on

Stuthepirate said...
As a rough guide for freeriding boards and sails.
Sail size x 6 ie:

4.4m x 6 = 26.4
6.6m x 6 = 39.6

and so on

Thanks!

Another example of the same board/sail/fin calculator here:
www.poolewindsurfing.co.uk/windsurfing-boards-windsurfing-sails-size/

You can also download your own excel spreadsheet version of the above calculator at:
www.poolewindsurfing.co.uk/wp-content/uploads/2010/01/windsurfing-equipment-calculator.xls

GazMan said...
To be honest with you Sue and with respect to others opinions, I would suggest emailing Tabou and popping the question to them as I think the board manufacturer would be the best source of this information (luckily the same one for the three you mention!). Make sure you mention what year your boards were built and your weight (and obviously the sail sizes you plan to use on each board).

Yes I will. The 125 came with the 44cm and i think the 95 with the 30cm..

sboardcrazy said...
I was having trouble getting upwind so I got the 24cm and it was much better.

Sue, I think I've previous been down the path you're on wrt keeping upwind. After getting increasingly larger fins, and increasingly sore ankles, a friend suggested going with a larger sail, orthesame sail rigged for more power, with a smaller fin of our bump and jump Port Phillip Bay conditions.

It was a revelation. I got more powered up, but with less drag from the fin, which = few catapults when a gust comes through and better acceleration which (counter intuitively) actually made it easier to get planing. However, in light winds it does mean having to bear away more to get on the plane.

The maximum fin I run with a 6.6 is a 39cm c3 Venom with a 66 wide CA board. If I'm having trouble keeping upwind on this, it's because I'm not planing (and I need to change up to a 7.8) or I'm not concentrating on upwind technique. But if the wind is up, I'll use a 36cm or even 34cm.

It means I have to not load up the fin so much and concentrate on technique, and have to get used to more power in the sail, but it does mean you go faster. And faster sailing means it's easier to stay upwind.

sboardcrazy said...
I tried my 7.2m NX on the 95 ltre board at the weekend with a 30cms fin. I only did one run and muffed the gybe but I was suprised at how much easier it was in a straight line in the chop.I think I'll be falling in on the gybes for a while with the heavier sail but I'll use the smaller board in less wind now.Just got to learn to uphaul it in slop..
I also used the 5.8m + 30CM fin with it as the wind was picking up and enjoyed sailing into the chop and got some jumps for the first time in ages although the boards was still a bit big & bashed into it on one tack.
As I was tiring I then puton the 4.8m hucker and I musy admit I do enjoy the smaller sails! It was the first time I'd used the Hucker and boy ..it even made my crappy chop hops feel good!

Tabou recommend 4.2-6.7 sails on the 95 so 7.2 may be a bit on the large side. Sounds like your 6.6 would be the max to use and a larger fin around 34-36cm would greatly improve the bottom end wind range of the board (though having a 125 Rocket to step onto would negate the need for a bigger fin in the 95!).

I think the 5.8 on your Rocket 95 would probably be the optimum sail size for that board/fin combo. I did hint to it previously but I suspect that the 95 will feel much more balanced with a 5.8 than with a wave sail around 5.0, particularly if you're still running the standard fin in the board. If you're using a 4.8 or 5.0 then the 95 will likely handle and gybe better in choppy water with a smaller curved freeride fin around 25-27cm (when I've used a 4.5 wave sail on my Hawk 93 in strong winds, I changed down to a 25cm freeride fin and this combo worked much better).

As a matter of interest Sue, what year is your Rocket 95? (I may be getting one myself soon).

GazMan said...

sboardcrazy said...
I tried my 7.2m NX on the 95 ltre board at the weekend with a 30cms fin. I only did one run and muffed the gybe but I was suprised at how much easier it was in a straight line in the chop.I think I'll be falling in on the gybes for a while with the heavier sail but I'll use the smaller board in less wind now.Just got to learn to uphaul it in slop..
I also used the 5.8m + 30CM fin with it as the wind was picking up and enjoyed sailing into the chop and got some jumps for the first time in ages although the boards was still a bit big & bashed into it on one tack.
As I was tiring I then puton the 4.8m hucker and I musy admit I do enjoy the smaller sails! It was the first time I'd used the Hucker and boy ..it even made my crappy chop hops feel good!

Tabou recommend 4.2-6.7 sails on the 95 so 7.2 may be a bit on the large side. Sounds like your 6.6 would be the max to use and a larger fin around 34-36cm would greatly improve the bottom end wind range of the board (though having a 125 Rocket to step onto would negate the need for a bigger fin in the 95!).

I think the 5.8 on your Rocket 95 would probably be the optimum sail size for that board/fin combo. I did hint to it previously but I suspect that the 95 will feel much more balanced with a 5.8 than with a wave sail around 5.0, particularly if you're still running the standard fin in the board. If you're using a 4.8 or 5.0 then the 95 will likely handle and gybe better in choppy water with a smaller curved freeride fin around 25-27cm (when I've used a 4.5 wave sail on my Hawk 93 in strong winds, I changed down to a 25cm freeride fin and this combo worked much better).

As a matter of interest Sue, what year is your Rocket 95? (I may be getting one myself soon).

With the 95ltre -In the weed I change down to a 21cm chunky fin when I run the 4.2m or smaller sails. Low side gusty 20kts I run the 30cms or go the smaller 21 for consistent 20kts..
For the lake I've got a 26cm B & J fin I use for the 4.2m in 20 -25kts 3.8m 25 - 30kts and that settles it down.
Or I used to . Now I have the 78ltre when it gets consistents 25kts + I use the pocket wave with its 24cms freeridefin.If its nuking Id use the 22cm wave fin on it.
2008 models but I bought them in 2009/2010..They were both still in packaging when I got them. They have the double concaves.

Carantoc said...
Might be a bit obvious but I generally have a rule for myself (well, more of a guideline than a rule) to use a smaller fin than sail.

So for a 6.6 m2 sail use a fin smaller than 6.6m2. For 4.2 m2 sail use a fin smaller than 4.2m2 and so on.

Generally it is very hard to find a fin anywhere near as big as a sail, so generally it is an easy rule to follow

Glad to be of some help.

Cripes a 6.6m fin would be amazing..The setup might end up upside down in the water though..Need a snorkel

yeh i think the problem is that 7.2m sail, its to big & that 125lt board.
i've got about 20-30kgs on you & my big board is 98lt, the biggest sail i like to use is a 6.2. I have a 7m but only use it if i have to <15kts & i normaly go do somthing else if its that light.
I would be using your 95lt as a big board & ya 78 as a little one. My little board is 85lt so it sinks if it not blowing 25 30kts min.

Obelix said...

sboardcrazy said...
I looked that up . Its just that everyone around here seems to run big sails on little boards and they don't get bashed around in the chop like I do ( although they are heavier). I thought I'd try what they do..

Decided to put on weight?

Nah I do that any way..

I wonder how fin size relate when you are coming into overpower conditions ?
Usually you want your fin to get you planing as soon as possible but when over powered I think that smaller fin has advantage.
I have been sailing today from 2 pm to 5:30 on my 8.0 m2 RAM at 22 ktn, 110 L on quite big chop on Shearwater and 34 cm fin was just right top achieve top speed and slight and soft over that chop.
In lighter winds I use 44 cm.
I am not sure if sizing down fin would help if I want to extent to 25 ktn in the same choppy condition on my 8.0 sail.
As today I get relatively mild spin out only once...

I feel like 8.0 for that condition was perfect and I could easy handle up to 25 ktn and be still in control and allow for full speed over that chop.
What the pleasure when you could now pass motor boats stragling on that chop and you could nicely fly over it

jh2703 said...

Macroscien said...
I wonder how fin size relate when you are coming into overpower conditions ?
Usually you want your fin to get you planing as soon as possible but when over powered I think that smaller fin has advantage.
I have been sailing today from 2 pm on my 8.0 m2 RAM at 22 ktn, 110 L on quite big chop on Shearwater and 34 cm fin was just right top achieve top speed and slight and soft over that chop.
In lighter winds I use 44 cm.
I am not sure if sizing down fin would help if I want to extent to 25 ktn in the same choppy condition on my 8.0 sail.
As today I get relatively mild spin out only once...

I feel like 8.0 for that condition was perfect and I could easy handle up to 25 ktn and be still in control and allow for full speed over that chop.
What the pleasure when you could now pass motor boats stragling on that chop and you could nicely fly over it

Your keen using an 8.0 in 25 knots, I'd be on a 5.4 and I'm a fat bastard...

Right, but only when I do feel that I could run full speed, at moderate chop, then board will softly fly over the chop.
Feel like car running over bumpy road, the faster you go the smoother it is.
If I only slow down that I could feel every single bump, but speeding up moderate that.
Anyway I am fat bastard too, at my 83 kg now

FormulaNova said...

Macroscien said...
I wonder how fin size relate when you are coming into overpower conditions ?
Usually you want your fin to get you planing as soon as possible but when over powered I think that smaller fin has advantage.
I have been sailing today from 2 pm on my 8.0 m2 RAM at 22 ktn, 110 L on quite big chop on Shearwater and 34 cm fin was just right top achieve top speed and slight and soft over that chop.
In lighter winds I use 44 cm.
I am not sure if sizing down fin would help if I want to extent to 25 ktn in the same choppy condition on my 8.0 sail.
As today I get relatively mild spin out only once...

I feel like 8.0 for that condition was perfect and I could easy handle up to 25 ktn and be still in control and allow for full speed over that chop.
What the pleasure when you could now pass motor boats stragling on that chop and you could nicely fly over it

Are you really sure it was 22 knots?

From: www.seabreeze.com.au/graphs/nsw.asp please note the bit about "Read the wind speed from the middle of the arrow."

If that graph is of where you were sailing, it shows that it didn't even get over 20 knots anytime in the afternoon, except in the gusts later.

That's right , this nice gust that give you this feel alive and the speed.
But all is the matter of water surface. If there is plain enough that you could release full speed without loosing control on the chop that is fine.
But same place three days earlier and me on 5.7 on 35ktn even smaller board and all I could do was only snail pace climbing on the waves, not much fun at all.