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Dinghy speeds |
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iGRF 
Really should get out more 
Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6496 |
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 Posted: 07 Jan 22 at 12:17pm |
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I'm surprised nobody's mentioned that Albacore claim that was doing the rounds when I first turned up here.
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423zero
Really should get out more
Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3399 |
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Posted: 07 Jan 22 at 12:19pm |
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What claim ?
Nothing wrong with Albacore.
Edited by 423zero - 07 Jan 22 at 12:42pm |
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Robert
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iGRF
Really should get out more
Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6496 |
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Posted: 07 Jan 22 at 1:17pm |
Somebody was making ridiculous claims as to how fast they'd made one go. Must have kept lots of folk up claiming somebody on the internet is wrong. |
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423zero
Really should get out more
Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3399 |
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Posted: 07 Jan 22 at 1:26pm |
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Just in case you don't want to read old thread, here is article that caused disbelief.
http://www.albacore.org.uk/results/2007/internationals2007.htm
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Robert
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Ozzytub
Newbie 
Joined: 10 Nov 19 Location: Essex Online Status: Offline Posts: 16 |
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Posted: 07 Jan 22 at 2:27pm |
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I was just saying to my son driving a car is now the most boring thing you can do and i need a boat which was quick and exciting.
This thread makes me realize how slow a dinghy is but how exciting they can be.
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CT249
Far too distracted from work 
Joined: 08 Jul 06 Online Status: Offline Posts: 399 |
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Posted: 08 Jan 22 at 3:28am |
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What evidence is there that the Aero did 23knots plus? That seems exceedingly doubtful considering the speed of other craft and the Aero's moderate overall performance.
There may have been a GPS reading of 23+, but GPS units "spike" a lot and therefore in competitions like GPS windsurfing there are rules in the units that can be used and the way results can be interpreted. On the other hand, if the Aero IS that fast then the sailors must be terribly bad for it to have a yardstick little faster than a Laser. Personally I'd say it's far more likely that the 23 knots figure is a vast exaggeration.
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Chris_H
Far too distracted from work
Joined: 13 May 20 Online Status: Offline Posts: 237 |
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Posted: 08 Jan 22 at 8:38am |
A simple Google would have shown you this Speed Freak |
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CT249
Far too distracted from work
Joined: 08 Jul 06 Online Status: Offline Posts: 399 |
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Posted: 08 Jan 22 at 10:46am |
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Actually, it doesn't. There's nothing on the RS forum to show what GPS was used, how the data was analysed, etc etc. These are critical factors in GPS speeds, which is why there are restrictions under GPS speedsailing, for example.
Why should we believe this figure and not the 22 knots or whatever the Albacore "achieved"? Why should we believe this figure and not the 60 knots that the guy at my old club carried his big headsail in? He had an anerometer so surely it must be true....... |
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Grumpycat
Far too distracted from work
Joined: 29 Sep 20 Online Status: Offline Posts: 497 |
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Posted: 08 Jan 22 at 12:09pm |
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Think your taking this a little to seriously
 
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Mozzy
Far too distracted from work
Joined: 21 Apr 20 Online Status: Offline Posts: 209 |
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Posted: 08 Jan 22 at 12:16pm |
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there is a lot that's suss about the aero top speed. - Track looks very shaky, suggest large GPS error. - Speed graphs look peaky (27 mph down to <15 then back up again all within a few seconds) - Short runs (0.3 miles) - Seems other recording were done on a Garmin Edge 520 he has. I have used this to, but without a good gps fix on glonass satellites and recording set to 1 hz then it's pretty useless for speed. It's designed to be used with a bike wheel speed sensor. - max speed on a doppler device for same class is 20.6 knots (and that was speed a 1 second peak over a knot more than the speeds a second either side). On both the windsurfer and 800 for a 1 km run top speed will only be about 10-15% more than average. Here we have doublings of speed. That could just a characteristic of chasing huge gusts in mega wind in a small uno sail though. My windsurf speeds and 800 speeds are all done at a fairly narrow AWA. The aero's can get out in massive conditions though (although to be fair so can I on windsurf kit). But the 800 I wouldn't really be leaving the beach in 30 knots. So perhaps it's plausible, but the evidence for the 23.9 knots isn't rock solid.
I think you could improve class speed competitions like this by just asking for 1 hz data and have peak speed defined as 2 seconds and then have a 10 second record too. 10 Seconds would be short enough that you don't fall out of an gusts, but long enough to have some confidence in the data (at 1 hz). |
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