iS 121 recommended sail sizes/wind range for 80kgs?

[Ken]

Duracell,

I weigh 76kg and use 6.6, 7.6 and 8.4 sails in my is 111. Based on your size and the iS121, I would estimate (ideal wind, not the possible range):

8.1 = 15-20 knots
8.6 = 12-18 knots
9.5 = 10-16 knots

You probably could plane in less wind than listed and could hang on in gusts above those listed. Since I am an older guy and a little smaller in weight, I personally would go about .5 to 1 meter smaller in the wind ranges I listed.

Hope this helps -

[Duracell]

thanks folks, it is nice being able to ask questions like this and getting some answers.
Windsurfing can be a quite lonely sport on the water.

I'm still quite impressed with my iS 121 WC, it handled my 9.5 sail + 47 fin with ease in winds gusting up to 20kts today in sometimes very choppy water (lots of boats). Top speed was an incredible 31.28 kts (2s GT-31) no wipe out.

[Ken]

Wow,

That's a lot of sail on a small board in a stiff breeze. Amazing speed in the rough water too. Impressive!

[insandout]

hy Duracell,
can you send me gps track ? insandout2000@yahoo.it
what sail do you speak? RSR evo2?
thanks

[Duracell]

sail was an old gun Booster 9.5 with a LOT of downhaul, breaking all the way down till under the boom. Fin: select pro slam (PS) 47.
whish I could send gps data, but word of warning, a day later I lost the thing, it fell out of the armstrap "optimized" for it (like in, use the strap and always use the newest GT-31, you might need to replace it now and then...) (.
Although there was lots of chop/boat waves I did occasionally find some flat water and was able to open throttle all the way.
I'm still massively impressed with that board and will soon try a 10.4 on it since the 9.5 works like a dream (and need a small repair).

[ChrisN]

Duracell, just seen your question, and a lot of the rather emotional responses received! I think that as some mentioned you find the Size of Sail to Wind-Range to Board that fits your skill and conditions, yet this is not ROCKET SCIENCE.

While not as advanced a rider as some of the ones on the response list, here is MY overview of sails for each wind range and with the optimal, avg. wind-strength per sail.


SAIL_SIZE| RANGE (KNOTS)|OPT.KNOTS|OPT.M/S|
---------------------------------------------------
SL 10.5__|_____08-12____|___10____|___5___|
SL 9.50__|_____10-14____|___12____|___6___|
SL 8.50__|_____12-18____|___15____|___8___|
SL 7.50__|_____14-22____|___18____|___9___|
SL 6.50__|_____18-30____|___24____|___12__|
SL 5.50__|_____22-34____|___28____|___14__|


Remark that by SL = I denote Slalom/ Freerace Sails with at least 2 Cambers (I use NP and Simmer 2XC/3XC), while the Sizes are indicative. The Ranges shown are for for Slalom/ Free-Race boards above 100L - smaller boards act /react differently. Rider Weight = 88 kgs. Note that OPT denotes OPTIMAL, which is a Median performance point OR a Sail to Size "Perfect" wind strength...



I checked the coarse list above with NP and they agreed for the last year's NP RSS/RSR series (i.e. Slalom/Racing).
There are a couple of IFs though:

• Racing/Slalom sails are "heavier" given all the Cams, thus more difficult to handle while slogging; They also plan a bit later, BUT can handle nuclear winds or gusts better!
• Freeride Sails with 2/3 Cambers are more amiable and easier to handle in maneuvers. However, pon Similar Size as the ones shown above they appr. 0,5 m2 to provide the same power as the Racing Sails
• Freeride Sails with NO Cambers are the most fogiving, thus easiest to handle in maneuvers. However, for Similar Size as the ones shown above they appr. 1 m2 to provide the same power. Because they have a pressure-based batten enforced profile, they are "softer" thus loosing a LOT of power in Lulls (as the profile flattens out).
• On Sails, there is a NEW category for FreeRace Cam'ed Light-Wind Blasting sails that have a Deeper more low-end powered Profile Template (which is tough on high-end); These are sails like NP Helium and Severne Glide, may be quicker than the list above by at least 1/2 knots. Thus a Racing 8.5 m2 helps you reach static planning (i.e. without pumping) from 12 knots, while Helium according to NP and RIKS help you plan from 10 knots (remark these are the numbers for a 89 kg!).
• On Rider Weight, as you are 8 kgs lighter then you can probably remove a 1-2 Knot(s) at the Low-end of the range of each sail, thus you should be able to plan a 8.5 m2 on a 120L SL from 10 knots.
• Finally, on Board "Easy Planning" potential, width and weight means a lot as we have been all discussing in our previous thread

That's all from my own experiences. If there are any radical departures let's hear it from the TEAM too...




R. ChrisN

[BelSkorpio]

Like always, very analytical and very correct according to me, Chris.
I fully agree.
Another table to copy and paste onto my dekstop.
Personally, I would also subtract 1 - 2 knots at the low end for my weight of 86kg.

Greetz.

[Ken]

ChrisN,

I like the table, but I would question the OPT Knots for the 7.5, 6.5 and 5.5. All seem high, especially the smaller sails. For me at 77kg on a iS 111 and a 105 liter free ride board on cambered race sails (from 6.6 up).

7.5 - 16 knots
6.5 - 19 knots
5.5 - 22 knots

The question is who does your table fit? What type of sailor and experience is necessary to use the table to select a sail size? It seems to me that the type is - a highly skilled advanced or expert sailor.

Nevertheless, thanks for your input.