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Old 15th January 2014, 01:00 PM   #11
Chris Pressler
Join Date: Sep 2006
Location: AUSTRIA, Lake Neusiedler
Posts: 333

Hi Dutch Dude,

8.4 with 46cm (eventually bigger up to 50 for light wind cruising)

above 9m 46 or 48

hope it helps,

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Old 5th February 2014, 07:26 PM   #12
Join Date: Sep 2011
Posts: 31

Hi mate,
there is a big difference between the board/sail sizes used for slalom racing..usually by guys heavier than you, and recreational sailing. I have used the 133 ( and now 127) a lot for the latter and I am the same weight as you. You have absolutely no reason to go for the 137 and in fact I would not bother with a sail bigger than 8.5 unless you are trying to maximise very light wind days........personally if it is that light I find better things to do on the water. I mostly use a 49 Select on my 127
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Old 10th February 2014, 09:48 PM   #13
Join Date: Jul 2009
Posts: 127

How come ultrasonic can handle smaller sails relatively, than isonic 130?
Or rrd x fire 129: sailrange 9-10 and ultrasonic 7.5-12?

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Old 10th February 2014, 11:08 PM   #14
Join Date: Apr 2009
Location: Montréal (PQ) CANADA
Posts: 245

personally i think that is a "misconception" and hope StarBoard will confirm
i have an old FreeFormula that is supposed to handle 8.5 to 12m sails
my largest sail is a 10m sail that goes really well with this board.
when i try my 8.4 on this board, i find it is too much board for the sail
prefer a larger freeride or slalom board with such a sail
would guess the "true" range of the SB US is 9-oh to 12m
with around 10 as the ideal !!!
8.5 perhaps - but NOT 7.5 !!!
sailor weight dependent of course...
joe windsurfer @ 105 kg
2012 JP SLW92, 2013 AHD SL-2 132, 2000 Fanatic BEE 124 LTD + Mistral Equipe II XR (Mistral SLE303 to beat up)
HSM Fire 6.3, NS Duke 6.9, TR-6 8.4, HSM SPF 8.5,TR4 10.0

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Old 15th February 2014, 08:56 AM   #15
Join Date: Aug 2011
Posts: 22


I weigh 72kg and have an isonic 127 as well which I use with a gaastra vapor 8.6 and 9.5 .. on the Veerse Meer. Since the birth of our son we only go out on the light wind days so this was the primary reason for me to buy one .. I have to admit that the ultrasonic was a board I was looking into as well .. but the difference for our weight between the 2 is minimal and the 127 would be more fun and responsive and longer controllable.
Me, myself am very pleased with the board and is a real racing machine in light winds and up to 3.5 to 4 Bf especially when you have a lot of wind lulls you just keep on planning.
I just purchased a 2013 107 isonic and my futura 11 goes to the girlfriend .. since these boards are so addicting.
To be honest I used my 127 with my 8.6 80% of the time this summer. The 9.5 is for really marginal days and yes you need to work the isonics, but the rewards are plentifull :-)
I use my 8.6 with a BPf 47,5 and the 9.5 with a 50.5 keep in mind that you can surf the BPF fins a little shorter than most fins since that give a lot of lift.

cheers mate

ps little video this summer .. did not have a lot of footage but hey

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Old 15th February 2014, 10:19 AM   #16
Join Date: Aug 2011
Posts: 22


weight 72 kg

I use the IS 127 with 8.6 and 47.5 BPF fin and 9.5 with 50.5 BPF fin in really marginal conditions
The 127 is a great light wind board and super fast but you need to work it to get best out of it .. very addicting ..
For me it's starts planning between a little under 3 BF with some pumping of course to get going. Sweet spot is a 8.6 m
I sail the gaastra vapors

little video from het Veerse Meer this summer .. did not have a lot of footage to busy having fun :-)

Last edited by Stargazer; 15th February 2014 at 10:26 AM.
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Old 16th February 2014, 09:01 PM   #17
Join Date: Apr 2010
Location: UK
Posts: 296

can confirm that an 8.5 is about as small as I would want to go on the Ultrasonic and even then when getting overpowered the rail and nose start to lift. but it is a lovely combo when in flatter water and you are comfortably powered up.

The reason the Ultrasonic has such a large windrange is the fact that it has a more freeride shape than the full on Slalom boards like the isonic.
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Old 17th February 2014, 08:03 AM   #18
matthew spooner
Posts: n/a

I own an IS133 (85cm wide) and IS110 (75cm wide) an IS101 (64cm wide) and an IS87 (56cm wide)

The equation is not just about width or about volume, but a combination of the 2. I weigh 88KG, The Is133 (which is actually 127L) is a great board, however, with my weight and a 9.6 it is actually quite difficult to get planing, and requires a good technique. However, once planing it is brilliant and seems to power through every lull. I would say that the IS127 is ideal as the biggest board for someone around 80 KG. I have not used the 137, however, I would think that it will get unmanageable for lighter riders very quickly.

If your only intention is only to race, the IS117 is perfect for a most sailors as it will be working well at the minimum wind speed with a 9.2m sail. Heavier sailors will probably use the IS127 with a 9.6

If you want to maximise your time on the water in light winds, I would go bigger and have a IS127 or an IS137 for heavier sailors

I will be changing my IS133 for a bigger board. I find that the IS133 is too close to the IS110. The sweet spot on the IS133 is the 8.6m sail - It handles the 9.6 well, I am just feeling that with my weight it needs a few more Litres. The Is110 also handles the 8.6 extremely well, so as soon as I am powered up on the 8.6 then I will be on the Is110 as I prefer that board

The Is110 is an amazing board, it has a wind range from about 14kts on the 8.6 up to 25kts on the 7.0. It is a quick board, however, it feels very controllable even on very choppy water
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Old 17th February 2014, 10:41 AM   #19
Join Date: Jan 2009
Location: Belgium
Posts: 509

Hi Matthew,

Like you can see in my signature, I have the same combinations like you have, except for the IS133, I have the Ultrasonic. I weigh the same like you.
I still want to replace my IS122 for the newer IS110 (both 75 wide).

I can highly recommend you the Ultrasonic. It starts planing much easier and it will handle your 9.6 very well.
Furthermore, it will be much easier to point upwind in marginal conditions c/w the IS133.
I've been on other 85 wide slalom boards (Fanatic Falcons). Like you say, they are more technical to get them planing and once you get them planing they are pretty fast, especially downwind (typical PWA slalom courses). Upwind, the Ultrasonic performs far better and it is much easier to get into the rear footstrap.
If you're not concerned about speed and you don't need to win a downwind slalom race, but you do want to maximize the light wind days, the ultrasonic is really the best board you can buy.
IS87 / IS101 / RRD114 / US147

Last edited by BelSkorpio; 17th February 2014 at 10:48 AM.
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Old 17th February 2014, 01:31 PM   #20
matthew spooner
Posts: n/a

I have now had my Starboard quiver for a few months, and will be doing a write-up of my impressions. Would be great to get your input too.

I am not saying that the IS133 is slow to get onto the plane, infact I was out on Boxing day in glorious sun and 10 to 15 kts of wind. The issue I had is that there is no "in between" stage between non planing and full on in the straps planing - In sub planing conditions this board is a pig, it dives the nose and luffs upwind. However, as soon as there is a puff of wind, you need to point the board downwind, stand at the back of the board, give it a couple of pumps and it is off. For me, the board would be much nicer if it was a little longer and had 5 to 10 litres more in the nose. On the positive side, the short length and thin nose means that this board is still controllable with a 7.8 and 20 kts of wind, even when choppy
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