Laser 28 - Excellent example of this great design Hamble le rice |
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Laser 140101 Tynemouth |
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Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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List classes of boat for sale |
VMG |
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JimC ![]() Really should get out more ![]() ![]() Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
![]() ![]() ![]() ![]() Posted: 05 Sep 13 at 5:37pm |
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What these basically tell you is what angles you should be sailing at.
So, for example, if Peaky's curve for the RS100 is correct then if your round the cans course has a leg of 112 degrees from wind direction, then you should sail roughly half of it on a beam reach at 8 knots, and half with the kite up at 12 knots, rather than point straight at the mark at 5 and a half knots whinging about how terrible the courses are at your club... The trouble is that getting the angles right, exploiting the gusts etc is difficult (and thus easy to get horribly wrong) whereas pointing at the mark is easy. Edited by JimC - 05 Sep 13 at 5:39pm |
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i tick ![]() Groupie ![]() Joined: 15 Jul 13 Location: Tunstead Milton Online Status: Offline Posts: 93 |
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I dont really care. I aim at the mark and then bear away until it feels fast enough without missing the mark. Everyone passes me and I am last. I can guarantee that If I learn about vectors, polars and VM blinkingG's I will still be last. Once an idiot always an idiot.
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Koops ![]() Groupie ![]() Joined: 01 Mar 10 Location: Wiltshire Online Status: Offline Posts: 52 |
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Jimc: I think that u have just explained something that has been a mystery to me for a long time.
Years ago a chap who was regarded as 'pot hunting' borrowed a Vareo when the class was quite new and competed in a class event. I recall us being well bunched at the windward mark, hoisting spinnakers and heading off generally in same direction. However the borrower sailed much higher, off to the side of the course, hoisted and finished at the leeward mark far ahead of everyone else. I was greatly impressed at how he had managed to spot a pat h of breeze at such a distance, but am now thinking that he was much more skilled at boat polars. Thank you! |
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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As you know, I've raced against your boy, and I can safely say he has as good a natural knowledge of VMG as anyone else I've ever seen. How he computes it is another matter - I've no idea if he reads up on such stuff, makes notes etc, or just has excellent feel for what is going on - either way, he is using VMG. |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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i tick ![]() Groupie ![]() Joined: 15 Jul 13 Location: Tunstead Milton Online Status: Offline Posts: 93 |
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Thank you Rupert, however i am not sure he can read at all.....I do not deny that I am proud of him. After winning the Bytes at Sailfest he came to the club last Sunday late when he should have been packing for Australia. There was a spare Supernova for the last race. It was very windy and he has not touched a nova for at least a year. He dropped it in twice before the start and went off late but on one long close reach he took two boats by going low then hardening up. VMG? At the end he was way ahead of all the Novas and on the back of a 300. He won on PY massively.
Anyone got a good Streaker to lend for next years Nationals?
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sargesail ![]() Really should get out more ![]() ![]() Joined: 14 Jan 06 Location: United Kingdom Online Status: Offline Posts: 1459 |
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Reference to what's going on around you helps too! I was asked to sail to target speeds (which are derived from the polars) once......but it felt wrong (ie not best VMG). Sure enough when I asked to be allowed to sail it dinghy fashion by feel, we jumped forward in the fleet. Kind of suggested they needed to re-write the polars and target speeds. Conditions were not extreme - no big waves or tide to skew. But the bigger you go the more its about the mechanics of sail and hull, and less affected by other factors.
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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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So, are these 'polars' available for different boats, when was that one issued for the RS100? Where can I order one for the Alto and the EPS?
Then the next question (blindingly obvious even to an idiot) if there are such things, that are calculated on fact rather than anarchic fiction like club returns, why is it so difficult to have a given boat a permanent handicap calculated for it? |
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Noah ![]() Really should get out more ![]() Joined: 29 Dec 04 Location: United Kingdom Online Status: Offline Posts: 611 |
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Polars are rarely - if ever - available for dinghies because they are affected to a much greater degree than lead-mines by waves and crew mass. Also, I know of no class where the carrying of electronic aids is permitted (TacTic excluded), so you don't know how fast you're going anyway.
I also assume that the theoretical polars determined by the designer will be modified by on-the-water experience into a 'real' set. (e.g. Do It Yourself!). Finally, race lengths come into it too. A tiny speed advantage over 24 hours can amount to significant distance. One fluffed tack will have a much greater impact in a 15 minute upwind dinghy leg. |
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Nick
D-Zero 316 |
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alstorer ![]() Really should get out more ![]() ![]() Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
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Pretty sure i14s let you carry whatever electronics you want?
Some classes allow you to carry GPS tracking devices as long as there's no visible readout whilst sailing
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Al |
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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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I assumed that compass thing with the electronic read out that some folk use did all that, why would it restrict itself to just compass angle degrees? Anyone can wear a wrist mounted GPS device, I must have done at one time or other.
So, no, don't tell me, it's not permitted because of 'the class' they will not 'allow' a polar thing to be constructed for their craft? Oh and does this mean it's also illegal to take an iPhone out according to some classes? Given it's GPS and various tracking apps? |
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