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Dynamic ratings from Sailracer. |
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Simon Lovesey
Far too distracted from work Joined: 30 Nov 04 Location: United Kingdom Online Status: Offline Posts: 349 |
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Topic: Dynamic ratings from Sailracer. Posted: 30 Dec 17 at 11:53am |
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That is the basics, we know the length and angle of each leg, with time taken for each boat.
It is more a performance and efficiency indicator - so if 10 was the optimum and a class is performing at its peak, and 1 where it is really struggling eg a foiling Moth in non-foiling mode, with all the associated drag and a low LWL
Yes along those lines
We can import a weather file, with time stamps, direction and speeds etc, but that is not always available and we then use the CSPs to determine how well each class is performing. The system will try and calculate wind direction based on angles etc. Obviously the more data the better. Edited by Simon Lovesey - 30 Dec 17 at 11:54am |
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zippyRN
Far too distracted from work Joined: 14 Sep 06 Online Status: Offline Posts: 437 |
Post Options Quote Reply Posted: 30 Dec 17 at 12:05pm | |||
however the Merlins and National 12s do have fairly easily defined epochs due to their development class nature , not sure how that works for the Finns
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Post Options Quote Reply Posted: 30 Dec 17 at 2:16pm | |||
Okay, so for each class you will have a series of modes, which will be factor of how achievable their handicap is in that given mode.
Then for each class you will have some formula that defines which mode each class should be in for each leg. This is based on wind speed and direction, but in absence of that it is taken from back calculating to relative performance to other classes to estimate wind speed and direction. I'd be interested to see how wide the bin ranges are for true wind direction and wind speed. You already have 7 modes (although not all will be applicable to all classes). At most basic you could have three wind directions (upwind, downwind and reaching) and maybe five wind speeds (0-5, 5-10, 10-15, 15-20, 20+). That's already 15 types of 'leg' you have to define a assign a mode to for each class. Would you publish these tables of modes and handicaps for different types of leg in the NoR? There's enough chatter now when the handicaps come out... imagine the polemic with people sorting through tables of modes! Then the handicap over the entire races will be weighted by the amount of time each boat spent on each leg and what their corresponding mode should have been for hat leg. Handicap races are over time, so you will need to time each boat on each leg. So it's only ever going to be something that can be applied when everyone is logging GPS. If you're using leg times to calculate results you'll then have to define completion and timing of legs in the sailing instructions. It's all very complicated. But I admire the effort you're putting in. Fundamentally I don't think handicap racing is, or should be the bedrock of dinghy racing. So maybe that is fuelling my criticism. It's great if we have some numbers that allows kids to race parents after school and calculate results while sailing ashore. |
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Simon Lovesey
Far too distracted from work Joined: 30 Nov 04 Location: United Kingdom Online Status: Offline Posts: 349 |
Post Options Quote Reply Posted: 30 Dec 17 at 2:37pm | |||
Yes complicated, but all done automatically - trackers on the boats and buoys etc are uploading all their data in real time, with all the clever processing done in the cloud.
I actually agree, growing up in an era of 200+ boat nationals, unfortunately that horse bolted some time ago, and I think we are best looking forward, seeing what can be done to improve a sailing scene that has significantly changed in recent years and under increasing competition from other leisure activities.
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423zero
Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3406 |
Post Options Quote Reply Posted: 30 Dec 17 at 2:39pm | |||
ZippyRN,
Article from Dougal about Finns. http://www.yachtsandyachting.com/news/177256/Little-and-large-meet-again
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 30 Dec 17 at 2:49pm | |||
Does the system take crew weight into account?
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Simon Lovesey
Far too distracted from work Joined: 30 Nov 04 Location: United Kingdom Online Status: Offline Posts: 349 |
Post Options Quote Reply Posted: 30 Dec 17 at 2:59pm | |||
No - like PY we assume that people select a class that broadly suits their size and physique, and of course one they enjoy sailing
Edited by Simon Lovesey - 30 Dec 17 at 3:07pm |
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Online Sailing Results, GPS Tracking & Event Management |
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 30 Dec 17 at 3:05pm | |||
How much difference does weight from one end of a given classes weight range to the other make? I'd have thought it was considerable in some conditions.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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zippyRN
Far too distracted from work Joined: 14 Sep 06 Online Status: Offline Posts: 437 |
Post Options Quote Reply Posted: 30 Dec 17 at 4:31pm | |||
thanks for that , so it;s basically rig choice that sets Classic Finn away from Modern Finn .
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423zero
Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3406 |
Post Options Quote Reply Posted: 30 Dec 17 at 4:49pm | |||
Age of hull and whatever owner decides to rig it with, another complication to add to problem of PYAG and Sailracer.
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