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2016 PY Predictor |
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iGRF 
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Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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 Topic: 2016 PY PredictorPosted: 30 Jan 16 at 12:18pm |
The salinity of the water makes a difference as I've frequently waxed on about to deaf ears... I even noticed it, obviously on boards which are more sensitive to volume and flotation issues at tidal estuary locations, like Exmouth where depending how far up the reach the course was, at lower water the river water content over the salt made your board feel more sluggish. |
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 30 Jan 16 at 1:32pm |
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Sure, everything makes a difference, but I'll require a lot of convincing that water density makes a more significant difference than the presence or absence of soddin' great waves and strong tidal streams.
Edited by JimC - 30 Jan 16 at 1:33pm |
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transient
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Joined: 21 Aug 12 Online Status: Offline Posts: 715 |
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Posted: 30 Jan 16 at 2:30pm |
I'd like to see it but it's a tricky one as Jim says. A tidal current of say 3 knots really clobbers the slower boats significantly in relation to the faster ones. This particularly effects the youngsters in slower boats. Not great encouragement to participate in club racing. |
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davidyacht
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Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
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Posted: 30 Jan 16 at 3:08pm |
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Especially if the marks are positioned so that there is a lee bow effect
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Happily living in the past
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Rupert
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Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Posted: 30 Jan 16 at 3:18pm |
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It may well be tricky, but it would be closer than not having it. I'm happy with having comparisons to similar waters, but anything a club does itself is open to club politics getting in the way, and also requires someone with the time, knowledge and interest to do it. A list for clubs with "inland" written at the top or "tidal" would surely make not only better numbers for clubs who don't adjust, but a better starting point for those who do, or want to.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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jeffers
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Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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Posted: 30 Jan 16 at 3:54pm |
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What would be ideal would be if clubs grouped together with other clubs of similar water characteristics. Even inland there can be significant variation. For example my local club of Hunts is completely different to Grafham in most conditions and when the wind picks up at Grafham there are definite waves that you can use whereas at Hunts we never get anything like that. I know the 'great lakes' is there for the big inland waters but perhaps other club should look to make contact. They don;t even need to be that local in my view.
Even the tidal clubs must know of other tidal clubs where the conditions are similar enough even if they are not identical. They can then look at their recommended number from the PYS site and possibly form a better opinion of what might be a suitable number of the 'published' PY is clearly not right. I know I live in a dream world, most clubs are far too protective and inward looking to think of this.....
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Paul
---------------------- D-Zero GBR 74 |
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Do Different
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Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312 |
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Posted: 30 Jan 16 at 4:05pm |
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I don't know if you live in a dream world or not but perhaps rather than being protective or inward looking most clubs simply don't have anybody prepared to crunch numbers to that extent.
Why look for conspiracy & evil when apathy offers an obvious answer. Edited by Do Different - 30 Jan 16 at 4:07pm |
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 30 Jan 16 at 4:08pm |
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I spent a bit of time mulling over doing some better categorisation of water types, but it was just getting so complicated. Water area is a really big deal too, whether its a roll tacking bonanza or whether there's room for fast boats to stretch their legs, and current is perhaps an even bigger problem for small boats on rivers as on the sea... Maybe in a few years it will be possible to type in a few parameters like water area, wave height, current strength and get a personalised set of numbers for your water.
But another issue is that although it would be possible to produce different water numbers for the likes of say Solos, Phantoms and Lasers, if you consider classes that are already pretty marginal on data then you wouldn't have numbers at all for various water types, and so you'd have to be mixing two types of numbers. Its something that's definitely on the agenda, but the amount of data coming back isn't that great at the moment, which is definitely a problem for puting more granularity in. |
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Rupert
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Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Posted: 30 Jan 16 at 6:18pm |
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Your point about amount of data is well put, Jim, and sadly does rather knock the idea on the head.
Maybe what we need is a list of clubs with sailing area and location with a link to what yardsticks are being spat out, so a sailing secretary can easily find out what clubs might be similar and compare returns easily. No idea how you would go about doing this! |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 30 Jan 16 at 6:46pm |
Users of the PYS online site has the capability of comparing numbers from several clubs. Also looking at having a map of all club locations attached to it. It might be neat to have some categories so you can distinguish types of water. I'll have to suggest something. Have to work out suitable categories too. Edited by JimC - 30 Jan 16 at 6:55pm |
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