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View Full Version : iS 121 vs. iS 111 for 82 Kg guy, ~8sqm sail 12-15kts


Duracell
13th May 2010, 04:18 PM
Hi Team, Hi All,

planing threshold? I know both boards will fly as soon as they get going but with how little can they start planing (with sufficient sailor input...) with a ~ 8 sqm sail at 82 Kgs?

BelSkorpio
13th May 2010, 09:05 PM
Hi Duracell,

I 'm 86 kg and get a freeride board similar to the futura 122 planing from 11 knots. I've tried it last weekend with a 9.5 sail, merely as an experiment because I wanted to know if my board could handle this sail size.
From 12 - 15 knots I normally use the same board with 8.5 & 7.5 m2 sails without any problem. An IS 121 shoud plane even faster because of the bigger tail width.

Wether the IS 111 would do the same job for your weight, I leave up to the team to answer.

Duracell
14th May 2010, 10:12 PM
aw c'mon guys, I've got a bit of money burning holes in me pocket...

mark h
15th May 2010, 07:13 AM
Defo got to be the iS121/8m in the 12k to 15k range. I can get my iS111 going in 12k ish with an 8m but you will have no sensation of power, the 9m/iS111/powerfull fin would be my choice in those lighter winds, but even then I would much prefer to be on a iS131/144. I'm 105kg if that helps:)

I dont think the iS111 is right for you, take the iS121, easy choice:)

Ken
17th May 2010, 10:43 PM
Duracell,

You should be able to plane on both boards in 12-15 knots with an 8.0. You will have to pump the 111 a bit to get going, but once it begins to plane, it accelerates quite fast.

I have an iS 111, but don't like using my 8.4 on it. I am estimating that it will plane in about 11-12 knots if there is a steady wind. However, where I sail the wind is highly variable with 5-15 knots being the norm for a light/moderate wind day. This is where I would use the 8.4, but I get stuck with frequent slogging when the board comes off plane. I only weigh 78kg and the slogging is a pain in the a## with the 8.4, so I wait until there is more wind and use my 7.6.

I have my formula board for the 5-15 knot days.

Duracell
18th May 2010, 12:48 AM
Hi Folks,

what about the iS 121, what would the lowest wind be to start planing (at 82 Kg) using
a) 8.1 sail + stock fin
b) 9.5 sail + 47cm or 49cm Select SL7 fin?

c) what about the iS 111 with 8.1-8.8 sail and 49cm Select SL7?

mark h
18th May 2010, 06:16 AM
10 knots ish :)

agrelon
18th May 2010, 09:28 AM
Yeh, 10 knots sounds about right. I can get my Futura 93l to plane with a 5.6m in about 12 knots (I'm 55kgs). With the 9.5m and the much wider tail of the iSonic 121, I reckon planning in 10 knots is feasible, definitely 11-12knots for sure.

As Mark said, when you get planing at the very limit of the windspeed needed, the you have no power in board and staying in the straps for long generally doesn't happen...

I think the 121 could carry a 9.5m (team input needed here) as Tiesda You claims he can use a 9.0m on his 101, though SB are very generous in their windrange stats...

agrelon
18th May 2010, 09:48 AM
http://www.youtube.com/watch?v=QlDkqOrDZYQ&feature=related

Guess this shows the iS121 + 9.0m sail/board combo works.

Duracell
19th May 2010, 01:57 AM
Well here are my humble impressions:

- forum should be renamed to : don't ask the team, they won't answer anyway
- some people just post a lot of non personal experience (very questionable)

besides that I went for the iS 121 WC (little pun, WC means toilet in German... hope its better than that).

Oh and again thanks team...

Remi
19th May 2010, 05:39 AM
Hi Duracell,

Please found here the relationship between size sails and fins :


iSonic 86 Slim : Sl4 30/5mē / 32/5,4 / 32/5,8 / 34/6,2 / 34/6,5 / 34/6,8
iSonic 86 : Sl4 30/5mē / 32/5,4 / 34/5,8 / 34/6,2 / 34/6,5 / 34/6,8 / 36/7,2
iSonic 94 : Sl4 32/5,4mē / 34/5,8 / 34/6,2 / 34/6,5 / 34/6,8 / 36/7,2 / 36/7,5
iSonic 101 : Sl4 34/5,8mē / 36/6,2 / 36/6,5 / 36/6,8 / 38/7,2 / 38/7,5 / 38/7,8 / 40/8,3 / 42/8,5
iSonic 111 : Sl4 36/6,2mē / 36/6,5 / 36/6,8 / 38/7,2 / 40/7,5 / 40/7,8 / 42/8,3 / 44/8,5 / 44/8,8
iSonic 121 : Sl4 38/6,5mē / 40/6,8 / 42/7,2 / 42/7,5 / 42/7,8 / R16 44/8,3 / R16 46/8,5 / R16 46/8,8 / R16 46/9
iSonic 131 : R16 42/6,8mē / 44/7,2 / 44/7,5 / 46/7,8 / 48/8,3 / 48/8,5 / 50/8,8 / 50/9 / 52/9,8
iSonic 144 : R16 44/7,2mē / 44/7,5 / 46/7,8 / 48/8,3 / 48/8,5 / 50/8,8 / 50/9 / 52/9,8 / 54/10,7
iSonic 150 : R13 48/7,5mē / 50/7,8 / 52/8,3 / 52/8,5 / 54/8,8 / 54/9 / 56/9,8 / 56/10,7 / 58/11

The best size to get the best performance for the iSonic 121 is around 8,5mē and for the iSonic 111 around 7,8mē

Seems that you have a 8,8mē so that will be the best sail on it with a R16 46.

Hope this help.

All the best