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16th September 2014 11:24 PM
mcross19 Yes I am Eric although at over 200 they are not cheap, I found it gave me a little too much lift when using the 9.5 with the US in gusty conditions. Another option would be to get yourself a Techart RSL06, mine turns up tomorrow and hopefully will get to use it over the coming week. My friend is using these successfully in his isonic 130, you should find them easy to source as they are hand made there in Italy.
16th September 2014 03:44 PM
Farlo Hello Eric,

Air density decreases with temperature. From 5 to 35C it goes from 1,27 to 1.14 so your 9.6 feels one sqm smaller (roughly). Air density also drops with altitude. I've seen people windsurfing at lake Cenis in the Alps (~2500m) with huge sails though it was quite windy. They told me that otherwise they would not plane at all. Lake Trasimena is not that high I guess, but altogether it makes a sensible difference.

Ciao,
16th September 2014 02:19 PM
Ericred0 Thanks for the fin advice Mcross are you suggesting i try a pre preg 58cm to get the same benefit as using a longer/larger fin? and Belskorpio i was thinking id try a 60cm of some sort in the future. I have noticed that with the ultrasonic because we're trying to get the most out of it in marginal planing conditions its very correct fin dependent.
Unregistered i thought the figures would of been much greater than the ones you quoted because the effects are quite striking especially the bouyancy of the board, not just this board but my isonic and my S type. To put it into context its the opposite to the difference when i sail in Dahab on the Red sea i find i can reduce my boards volume by 10-15 liters and thats going from UK fresh water into warm salt water. Anyway please don't think id like to get into a Geeky Tech discussion over this i just wanted to make a point that our kit works very different in different waters and climates. Thanks Eric
15th September 2014 07:41 PM
Unregistered
Quote:
Originally Posted by Ericred0 View Post
I've recently moved to live in central Italy and my local lake is lake the lovely lake Trasimena which is'nt renowned for strong winds so my main board once again is my Ultrasonic i use this with my Point 7 Ac1 9.6 and the standard 58cm fin which in the cool waters of the UK is fine but the lake is so warm that the density is quite low making me glad for the extra board volume, but the fin is definatly not big enough. The other thing is due to less dense air the sail seems to produce much less power, all in all the board doesnt feel as early a planer and it certainly doesnt sail through the lulls as well.
The point im trying to make is feedback from UK users is possibly quite deceiving to warmer country users around the world and in the UK we certainly get better performance from our kit. I do still think this is a great board and wouldnt be without it......
Hope this makes sense.
Eric
Hi Eric
The difference in density between a welsh lake and an italian one is going to be pretty small (10ths of a percent) and the buoyancy difference is maybe 1-2%. I can't imagine there is much difference in the salinity of the two lakes to cause anything noticeable Maybe my maths is wrong or the air density is the big thing that is causing the problem or maybe there is some other factor???
15th September 2014 10:20 AM
BelSkorpio Yes, I agee. The standard 58 Drake is not bad, but it can easily be pushed into a slip when pointing sharp. Even with my 8.8 sail.
With my 10.9 sail, I use a Deboichet R12 / 64. That goes very well. But I think it will be too big for a 9.5.
15th September 2014 09:02 AM
mcross19 Eric, I have the pre-preg version of the standard drake fin and it definitely delivers more power than the standard one, maybe you could try this solution?
13th September 2014 02:41 PM
Ericred0 I've recently moved to live in central Italy and my local lake is lake the lovely lake Trasimena which is'nt renowned for strong winds so my main board once again is my Ultrasonic i use this with my Point 7 Ac1 9.6 and the standard 58cm fin which in the cool waters of the UK is fine but the lake is so warm that the density is quite low making me glad for the extra board volume, but the fin is definatly not big enough. The other thing is due to less dense air the sail seems to produce much less power, all in all the board doesnt feel as early a planer and it certainly doesnt sail through the lulls as well.
The point im trying to make is feedback from UK users is possibly quite deceiving to warmer country users around the world and in the UK we certainly get better performance from our kit. I do still think this is a great board and wouldnt be without it......
Hope this makes sense.
Eric
25th July 2014 05:29 AM
mcross19 Morning people, here is a report from a friend who borrowed my 2014 Ultrasonic at the weekend which I thought relevant to post here:

"Martin very kindly let me have a go on his Ultrasonic on Sunday; the set up was a 2014 US with a 58cm R2R drake carbon fin and his brand new 2014 Severne Overdrive 9.5m. My personal biggest sail is a 7.8 but I am far happier on sails of 5.7 and smaller with sub 100l boards so before even taking the kit out I was concerned that it would be very heavy and cumbersome. First thoughts; the board was unbelievably light and the Overdrive rigged on a severne enigma 490cm mast and a technolimits carbon boom felt really really nice. I am around 75kg and an intermediate, on very flat water and pretty light wind around 8knts with gusts of 11knts with nobody else even close to planning. First run picked up a bit of a gust and bearing away with some pumping I was away and then stayed planning for the next km or so until i gybed. My thoughts: this board and sail combo definitely does plane very early but more than that it just stays on the plane through the lulls like nothing I have sailed before. I have average early planning skills but even so it was fairly easy to pump up onto the plane even with a fairly full on race race. Pumping seemed most effective stood a little further back than I would on other boards which I guess meant i could sheet in a little more and work the fin. Once up and going it felt pretty quick and very smooth. Around the corners it again felt super smooth although quite directional, maybe with more wind I could have cranked it through the gybes a bit more but in light wind it had quite a fixed radius. I couldn't carve tack with any pace partly due to how directional the board / fin was (and partly due to my lack of technique).

Overall, I found the US extremely easy to sail, its was very smooth and very forgiving. It certainly planned early, for me the difference was how, once it was going, it would just go through the lulls and could stay planning that was unique. So who's it for? I would say if you sail somewhere where its often 8-10 kts with little gusts then this is the board for you, if you are someone who wants to get planning in lightish winds without some serious pumping then again its a great board, or if you are someone who doesn't get to sail that often and needs to make the most of the conditions then get one! Personally, I would love one BUT I live by the coast and can get out more or less when I want on a forecast. As a result the amount of times owning a US would extend my sailing would be small because I would be on something smaller by the time there was a steady 12kts, Steve.
8th June 2014 06:43 PM
mcross19 Eric, I can understand where are coming from, ever since I owned this board I have always been amazed at its light wind performance. It is hard to imagine how they could improve on it but apparently they have!
7th June 2014 07:18 PM
Ericred0 If i hadnt bought this board due to lack of wind so far this year i would only of sailed a handful of times. In the past i would be waiting for force 4 plus to have a good windsurf but now im finding im having as much fun early planing in light winds as being powered up on smaller boards in good winds, its opened up a whole new side of windsurfing for me. Anyone else feel the same?
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