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Old 24th August 2015, 06:03 PM   #1
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Default Question for Ultrasonic owners.

I bought a new 2013 Ultrasonic as a replacement for my aging SLW154. Using those two boards side by side for a few days now I found that SU is not as early planing board as my SLW. In the same conditions with the same 10m free-race sail and Select S12 59 fin there is about 1- 2 mph difference. It was expected to a degree because of US’s lower volume and much narrower tail. It may also be because I know how to squeeze every drop of performance out of SLW, and US is a new board for me. I also noticed that US is much more sensitive to the fin choice. It gets easily overfinned as it picks up speed and starts doing wheelies in gusts, and as a consequence I have consistently better max speed by GPS on SLW. On the other hand, if I put a smaller (55cm) Select, it is harder to get it on the plane.
So my Q is:
Is there a mast-foot position that you found is better for early planing and/or optimal performance with a big sail?
I weigh about 90 kg wet, and I use a 10 m sail (mostly) and 8.4 sometimes.
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Old 25th August 2015, 10:41 AM   #2
mcross19
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Hi, I have the same shape US147 as you but a year later and am around the same weight. I have not tried the JP but from what I hear it has slightly better early planning capability but soon gets uncomfortable in the chop and the top speed is not quite as good especially in choppy conditions. Many people have sold their JP's after trying the SB but that is down to personnel choice.
I have my straps outboard and in the middle holes, the mast foot is around 5mm back from centre with the 8.6 and around 10mm when using a 9.5. If you are tail walking what you could try is edging the mast foot or straps forward plus a lower boom or longer lines will also help. I am using the 2015 Drake 58 carbon race NR fin for the 9.5 and a 56 Techart soft plus slalom fin for the 8.6. I do find the 58 gets overpowerd fairly quickly although it is manageable, I am toying around with getting a Techart 60cm soft plus or a 58 soft. I have no idea of select fins as have never used them but from what people say they can be quite stiff which is great for early planning but not so good for control, try a fin with a bit of a softer flex in the tip if you are still getting control problems, if you have the money get a couple of Z fins.
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Old 25th August 2015, 03:31 PM   #3
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Thank you, mcross19, for your info!
I think I'll keep my SLW for awhile for lighter winds and use US to cover the gap between SLW and 120L Ray on medium days to sort things out.
I'll contact Z-fins and ask them what they have to offer. Their site has pretty confusing descriptions of their products. For now I will try my Lessacher DuoWeeds 36 and 40 since the grass starts to be annoying (kinda late this season) on my lake. On SLW and freerides they give me quicker acceleration from standstill to planing speed, earlier planing and better max speed.
I know they are not proper fins, but they work.
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Old 27th August 2015, 06:38 PM   #4
mcross19
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I think they (Z-Fins) will make you a bigger version of their Slalom fin, Remi was talking about using these on the US147 and he recommends a 56cm I think.

The 2015 US147 has more width for earlier planning but having not tried it I cannot confirm.
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2015 Kode 86L Freewave, 2016 Flare 103L, 2015 isonic 107 & 120, 2014 AtomIQ 110 & 2014 Starboard Ultrasonic 147
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Old 20th September 2015, 07:40 PM   #5
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Very interesting to hear about US vs SLW! I had my SLW since 2009 and I found it very easy to get early planing and it runs lika a Volvo in chops, no problem at all. Compared to my iSonic 127 it is only about 1-2 knots slower in same conditions with the same sail and the SLW never dip front but that can happen with iSonic.

I run my SLW with Z-fin 52 cm with 6.7, 7.6 and 8.4 and then fin works perfect. This fin is a little bit faster than F-hot which is a little bit fast than Select S10.
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Old 21st September 2015, 05:32 PM   #6
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Pelegrin,
what is your weight?
What size S10 you've used, and with what size sails?
Just curious, what is the need to use tiny sails on SLW?
Those Z fins are bloody pricey though!
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Old 25th September 2015, 08:37 PM   #7
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i also am curious about the small sails with a Free-Formula type board

here i have put some discussion about SLW and US
http://joewindsurfer.blogspot.ca/201...-vs-sb-us.html
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Old 25th September 2015, 08:38 PM   #8
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i too am interested in small sail usage on Free Formula boards

here i have put some discussion about SLW and SB US:
http://joewindsurfer.blogspot.ca/201...-vs-sb-us.html
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Old 26th September 2015, 03:49 PM   #9
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The fin size of Select S10 is 52 cm. My weight is 76 kg. Normally I use 8.4 and 9.2 to the 52 fin but also 7.6 and 6.7. There is nothing strange with running the board with 7.6 or 6.7(!). SLW works fine with all sail sizes, so why not? I have no prestige problems always running small boards. I do not even like them. At my home spot I have a "transport" of at least 500 meter to reach wind. You would sometimes not manage with 110 liter or less, but it works with iSonic 127 and SLW 154. I love these boards and can not do without them.

If You can afford a Z Fin I recommend it but a Select S10 will also do.

Last edited by Pelegrin; 26th September 2015 at 04:02 PM.
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Old 3rd December 2015, 08:23 AM   #10
Etchv
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Hi, i know its a late post but i too can plane on my SLW 165 with my NP H2 7.2 and 8.2 at 10-15 knots wind easily. Planed also a few times with an NP Soul 6.6 at 16-20 knots. i use a Drake 60 when i use 8.2 and higher, and the JP stock fin 56 when using the 7.2 or below, and I weigh around 100kg. My friend owns a US which i borrow once in a while, and I also plane using the 7.2 with the same wind.

Last edited by Etchv; 3rd December 2015 at 08:30 AM.
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