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PY / Top Speed formula? |
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robin34024 
Posting king 
Joined: 03 Jan 12 Location: Lincoln Online Status: Offline Posts: 116 |
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 Topic: PY / Top Speed formula?Posted: 14 Mar 13 at 7:55pm |
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wouldnt be suprised if an mx ray was exceptionally fast for its PY downwind in heavy winds. upwind, it is terrible, but the manufacturer claimed something stupid like 23mph downwind...
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RS400atC
Really should get out more 
Joined: 04 Dec 08 Online Status: Offline Posts: 3011 |
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Posted: 14 Mar 13 at 10:06pm |
That's possibly right, measured over about 50ft, as you jump off one wave and hit the next. A fair component of that velocity may be downwards. Sounds fun to me! |
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getafix
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Joined: 28 Mar 06 Location: United Kingdom Online Status: Offline Posts: 2143 |
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Posted: 15 Mar 13 at 6:11pm |
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I've cracked the formula which applies to a great number of the boats I've owned and bar talk I have partipicated in.... 8o//0x
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Lukepiewalker
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Joined: 24 May 06 Location: United Kingdom Online Status: Offline Posts: 1341 |
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Posted: 15 Mar 13 at 8:14pm |
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As it's PY is presumably based almost entirely on displacement performance, if you could get an oppie to plane would that not be a potential winner?
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Ex-Finn GBR533 "Pie Hard"
Ex-National 12 3253 "Seawitch" Ex-National 12 2961 "Curved Air" Ex-Mirror 59096 "Voodoo Chile" |
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getafix
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Joined: 28 Mar 06 Location: United Kingdom Online Status: Offline Posts: 2143 |
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Posted: 15 Mar 13 at 9:25pm |
Applies almost universally, foiling toppers, foiling l*sers, foiling wineglass... Ok , foiling Wayfarer, frankly I'd like to see just how massive the lift wings would need to be..... Would we be talking AC or A380?
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Lukepiewalker
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Joined: 24 May 06 Location: United Kingdom Online Status: Offline Posts: 1341 |
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Posted: 16 Mar 13 at 10:06am |
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I said planing, not foiling.
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Ex-Finn GBR533 "Pie Hard"
Ex-National 12 3253 "Seawitch" Ex-National 12 2961 "Curved Air" Ex-Mirror 59096 "Voodoo Chile" |
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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: 16 Mar 13 at 11:43am |
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Oppies plane really well, and I'd agree that they would be a good bet for getting a good top speed compared to handicap, especially with a squaddy on board, pushing hard, parents shouting instructions from the shore...
Sorry, that last bit just sort of happened, out of habit... |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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getafix
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Joined: 28 Mar 06 Location: United Kingdom Online Status: Offline Posts: 2143 |
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Posted: 17 Mar 13 at 7:57am |
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don't dismiss the Albacore... we all know it will plane at getting on for 30knts
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Posted: 09 Apr 13 at 9:11pm |
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for what it's worth my best max speed in the 200 is about 15-16 knots. However, over 1 km it's only 12.9. When it's choppy it feels super fast but is actually quite slow. The fastest is on flatter water.
Interestingly, the 800 recorded 19.5 knots, then did 16.7 knots over 1 km. All on garmin forerunner. It's reasonably accurate, but the max speeds can be a bit spurious. Over 1 km it evens out pretty well. How do those compare when you run then on PY? 800 max 19.5/1000*820 = 16.0 200 max 16/1000*1053 = 16.9 800 1k 16.7/1000*820 = 13.7 200 1k 12.9/1000*1053 = 13.6
Edited by mozzy - 09 Apr 13 at 9:24pm |
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RS400atC
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Joined: 04 Dec 08 Online Status: Offline Posts: 3011 |
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Posted: 09 Apr 13 at 9:56pm |
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Interesting numbers Mozzy, I'm going to sort out where to put the GPS on the 400.
I don't have one with a peak speed feature, so I need to be able to read it while sailing. Not that my numbers will be the max achievable as we don't go out in silly wind like the younger hooligan element any more. I think having a GPS aboard while sailing against the tide could be quite depressing in light air. |
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