SB Sonic 2020 prequel

Windsurf equipment based chatter should be in here.
ronnie
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Re: SB Sonic 2020 prequel

Post by ronnie » Tue Jan 28, 2020 1:26 pm

I did look at an old Starboard a couple of years ago when I was looking for a board that could be used with a foil, and it had that strange shelf at the tail where a skirt had been. Sometimes called 'flappers'.

Some of the logic behind the skirt.
https://www.americanwindsurfer.com/articles/short-wide/

About 3/4 of the way down this
https://www.americanwindsurfer.com/arti ... er-shaper/

Bruce Wylie at the bottom explains how to redesign the tail so a flap is not needed.
https://groups.google.com/forum/#!msg/r ... 6vNLYh5GYJ

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AndyC
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Re: SB Sonic 2020 prequel

Post by AndyC » Wed Jan 29, 2020 5:03 am

ronnie wrote:
Tue Jan 28, 2020 1:26 pm
I did look at an old Starboard a couple of years ago when I was looking for a board that could be used with a foil, and it had that strange shelf at the tail where a skirt had been. Sometimes called 'flappers'.

Some of the logic behind the skirt.
https://www.americanwindsurfer.com/articles/short-wide/

About 3/4 of the way down this
https://www.americanwindsurfer.com/arti ... er-shaper/

Bruce Wylie at the bottom explains how to redesign the tail so a flap is not needed.
https://groups.google.com/forum/#!msg/r ... 6vNLYh5GYJ
Thanks Ronnie for all the info regarding the AVS, quite a lot of interesting read and a glimpse into a pioneering group of folks working on innovative concepts back in the day. I guess some of the end results of those concepts such as the CATs and even the AVS can be seen in many of the production boards today. The AVS flap has apparently reached its practical limit and simply incorporated into the overall rear section with multiple-stepped and cutaway diamond tail of the latest iSonics.
2020-Starboard-iSonic-77-Carbon-detail-01-1.jpg
As for this Sonic W75 I will just try to sail it in powered up condition (looks like some wind this coming weekend :) ) to get a feel for the characteristics as is, and also more specifically for how the extreme rearward positioning of the fin & footstraps behaves, whether spin-out occurs more often than expected before considering the need for any modification or even restoration of the flap, and shall post any subsequent findings here....
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Distinctly Average
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Re: SB Sonic 2020 prequel

Post by Distinctly Average » Wed Jan 29, 2020 10:34 am

It was interesting that later on the rubber flaps appeared again in some of the "race" boards from starboard and IIRC one of the formula boards.

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AndyC
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Re: SB Sonic 2020 prequel

Post by AndyC » Fri Feb 07, 2020 8:09 am

Just about the right amount of wind arrived on Saturday to try out the Sonic W75, as well as another old board Mistral Explosion 298 which I received together with the Sonic. First I rigged up a Naish Sprint 7.3 but then wind suddenly picked up considerably so I switched to a North 6.2 Warp instead. Actually I have not used any of these equipment before, and the Warp being a 4 cam race sail (don't know which year but has a grommet at the tack instead of pulleys) and with the normal Chinook black and blue line proved to be almost impossible to downhaul by hand sufficiently so I ended up switching it out for a formuline which finally did the job, but all this fiddling took a lot of time and the wind increased even more so I decided to use the much skinnier Mistral instead.
The Mistral is quite a beast to handle on land cause it weighs a ton seemingly and the longness of the board is almost novel to me :lol: Once in the water it livened up and actually quite fun and fast, plus it handled the chops like a hot knife through butter. Gybing however requires a bit more patience.
After about half an hour the wind subsided a bit and started to feel a bit marginal, so I took a break and switched it out for the Sonic. This granddaddy board actually feels not that different from a modern board of a similar caliber, and no sooner than the sail powered up it took off immediately. With that much more width I have to be more mindful of the bigger waves. For race boards I usually put the straps to the back most position and perfect for testing for how the board reacts without the flap. Actually it only spinned out once during a dip in the wind and when I was still putting pressure on it to go upwind. It happened quite suddenly and felt more abrupt than other spin-outs I'd experienced with other more "normal" boards, but it was quite easy to recover I didn't even have to unhook. Now that I know where the threshold is I adjusted my balance and was able to sail without it happening again. Actually I could now sense when a spin-out is about to happen and catch it just before.
So I think for a heavy set rider with a heavy back foot this flapless Sonic could be a problem, but I weigh 165lb and can go with my mass more evenly distributed this is probably ok for me without any more fussing about :)

Here's a link to the Relive for the session that day:
https://www.relive.cc/view/vMq5dznrxQ6

I mixed up the Endo data shot at the end of the Relive it is actually from the Mistral's session, so I have it uploaded here. They are in fact quite similar, probably why I had them mixed up :lol:
200201 SB Sonic 145 First Ride.jpg
Sail for e v e r ~ ~ ~

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