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Weight equalisation |
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Mozzy 
Far too distracted from work 
Joined: 21 Apr 20 Online Status: Offline Posts: 209 |
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 Topic: Weight equalisationPosted: 01 Jan 22 at 9:42pm |
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Some further points (if professional sailors got involved)
1) Is the ideal weight for the boat above, within or below the equalised weight/ If it was found to be (and that might vary on forecast and venue) then everyone would end up off one end of the scale. 2) If you are have a BMI < 21 it is possible to be off the low end of the weight equalisation (i.e. you have the maximum 5 lead) but you are still on the leverage scale. This results in you sailing at the same leverage as the boats equalised, but lighter (always preferable) 3) If you are very tall and again have low BMI it is possible to be off the leverage equalisation but still on the weight equalisation. This means you are sailing at the same weight as the other, but with more leverage (okay if windy) 4) If you dip weight before weigh, then rehydrate, in you sail the boat heavier than everyone, but with more leverage (okay if windy and within the range of how much you can dehydrate) 5) if you bulk before weigh in (then pee / poo) you sail the boat lighter than everyone but with less leverage (okay if light and within the range of a poo / wee) Most of those 'gains' are within a pretty narrow range and some have a downside. My gut feeling is that the ideal weight is within the equalised range. So unless you are confident in a forecast you'd be taking a big risk to do 1, 4 or 5. Guy and I fell in to line 2 for the 2020 nationals (rack 9/10 and 5 leads). If we were professional I would make sure we hit that weight every year. But, it's only a 1.5 kilo advantage. We could have dropped about 1.5 kilo and gone to rack 10 and taken a 3 kilo advantage. But with a system weight of ~300 kilo this is very small gains.
And we've also won two nationals on rack 6 and 7 and three and four leads. And we've also won plenty on rack 5 and three leads at other events. Edited by Mozzy - 01 Jan 22 at 10:02pm |
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Mozzy
Far too distracted from work
Joined: 21 Apr 20 Online Status: Offline Posts: 209 |
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Posted: 01 Jan 22 at 9:31pm |
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The 800 system works really well. It equalises for leverage and weight within a range. As someone who likes these things I've done all the calculations and mathematically it checks out, but also in practice it works very well.
The result is that the majority of the fleet are sailing in a very narrow bracket and even those outside the bracket are brought closer together. The major pro to this, is as a twin trapeze skiff that need a good size water to sail on, it's already a pretty narrow niche, so broadening out the competitive weight range help maintain good sized fleets. This is less of an issue for an olympic boat, but very welcome on the amateur scene. Downsides 1) is the boat is effectively 'slowed' down to equalise, if you consider maximum racks and no leads as the boats true potential (personally I find the boat plenty quick enough in equalised mode and making it any faster would likely lead to more breakages, a harder boat to sail, and smaller fleets) 2) it's admin weighing in at each event 3) lead is surprisingly expensive 4) inevitably where people aren't weighed in there are people on the wrong settings (although there is a pretty simple calculation you can do which will get you 90% there) For me 1 isn't a negative and the rest are worth it to open up the competitive weight range.  |
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Brass
Really should get out more 
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 01 Jan 22 at 1:55am |
You might like to look at the rest of CR C6 at the link I posted. Edited by Brass - 01 Jan 22 at 1:57am |
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iGRF
Really should get out more
Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Posted: 01 Jan 22 at 12:14am |
 OH Joy! They kept quiet about that, bet half fo them didn't know.. One of them does I bet he's been a previous class champion, am I going to give them the protest headache from hell.
Happy New Year everyone, except Tasarati! Edited by iGRF - 01 Jan 22 at 12:15am |
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Brass
Really should get out more
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 31 Dec 21 at 11:55pm |
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https://www.tasar.org/media/101985/TAS2019_CR_190408.pdf
C.6 Crew Weight C.6.1 The TASAR, while racing in all sanctioned events, shall carry a minimum total crew weight of 130 kgs. The crew shall be dressed in shirts and shorts, swim-wear or the equivalent, without shoes, all dry, at weigh-in. C.6.2 In the event that the weight of the crew, thus weighed, shall be less than 130 kg, such crew may race the TASAR, provided that, throughout the event, ballast equal in weight to at least the difference between the crew weight and 130 kgs is carried secured in the cockpit. The ballast carried need not exceed 12 kg. |
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iGRF
Really should get out more
Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Posted: 31 Dec 21 at 11:09pm |
How is the Tasar weight equalised? We've now got five or six racing at our place, other than them being quite light to launch and recover off the beach I don't see any equalisation method. There's also a bunch sailing over in Whitstable, where having that extra inbred sixth finger helps with that boom spanner thing I guess. |
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Grumpycat
Far too distracted from work
Joined: 29 Sep 20 Online Status: Offline Posts: 497 |
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Posted: 31 Dec 21 at 11:03pm |
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It’s a lovely boat BUT.
1) it’s a rare beast in the uk . 2) It’s under canvassed for uk sailing conditions
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Brass
Really should get out more
Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1151 |
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Posted: 31 Dec 21 at 10:15pm |
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Surprised no one has mentioned the Tasar
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Fatboi
Posting king 
Joined: 09 Aug 16 Location: Hampshire Online Status: Offline Posts: 189 |
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Posted: 31 Dec 21 at 10:18am |
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Mozzy would be the expert, but the 800s do weight and righting moment equalization pretty successfully if you are between 139 and 151kgs.
https://www.rs800.org/documents/p1b64dd5ob9t0jpm1eeoov3su3.pdf
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JimC
Really should get out more
Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 31 Dec 21 at 4:16am |
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Well that existed as well, but it all got complicated. Say a 5'6 sailor v a 6'6 one. Just run it on height and the little guy has to cross 2 feet more boat every tack than the big one. Now add an adjustment for extra leverage and it's even further.
To my mind what largely killed the concept was the realisation that at club level variances from sailor size are minute compared to those from sailor ability, and at Olympic level the crews trained to a perceived ideal weight anyway. So in both cases the hassle of managing it didn't deliver any great benefit. |
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