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Velocitek S10 and Action Replays
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MRJP BUZZ 585 View Drop Down
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Posts: 1496 		Post Options Post Options   Quote MRJP BUZZ 585 Quote  Post ReplyReply Direct Link To This Post Topic: Velocitek S10 and Action Replays
    Posted: 16 Apr 07 at 11:02am
Originally posted by Skiffe

Gday,

Attached is the downloaded GPS data for the Nats in “GPS Action Replay” format.  I have trimmed it to each race (ie no tracks leaving and returning to the marina).  There is also an HTML file that shows the top speeds, top 10 second averages and top 500 meter averages for each boat in each race.


There are a couple of obvious spikes in the data

 

If you would like the original source files in Velocitek Control Centre format (ie if you want to use Google earth or want to see how many times you capsized in the marina) then let me know and I will send them out.

 

I have made videos of the races where I have more than one boats data and have uploaded to YouTube.

 

R1: http://www.youtube.com/watch?v=hbVL4zsy3og

R2: http://www.youtube.com/watch?v=MkeiAdYmmr8

R3: http://www.youtube.com/watch?v=gmNc7WOtGZg

R6: http://www.youtube.com/watch?v=Mk8L4-vwmU4

 

The videos are very simplistic to cut down on size and complexity for the web.



Thats pretty good, I like the colour changes for different speeds
Josh Preater

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Ed B View Drop Down
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Posts: 1 		Post Options Post Options   Quote Ed B Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 07 at 1:21am

Originally posted by Guest#260

How did you convert from GPSar to somthing you can load on YouTube?

Video Screencapture of GPSar (Google "SnagIt")

Originally posted by Guest#260

Also - how do you make the tracks erase as they age?

Turn Trajectories on and choose "Footprints".  Then from the options menu under Path view settings choose "Path visible length" to adjust how long the tracks stay on screen.

These vids have basically every bell and whistle turned off in GPSar so that it can be clear in such a small resolution.
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I luv Wight View Drop Down
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Posts: 628 		Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 20 Apr 07 at 9:06pm
At last suitable conditions for the first club race of the tin teardrop DC


And a result! 1st on handicap vs some RS 400s and some RS 700s.

The joys of low water and an adverse tide of 2 kts - but it does mean tacking practice. Possibly more tacking in one evening than a whole nationals.

Two capsizes, one disconnected extension, but still fast enough to overtake the RS 400s and catch the RS700s on the first reach and gain enough time to beat the RS400s

http://www.youtube.com/v/riu6fe1VOyk

Velocitek GPS track. - just 10kts+ in a puff at the end. - but in light wind 5-8 kts.


The boat feels very easy to drive - but is also fast going backwards!.

The camber inducer sleve luff sail is very stiff and a bit dead feeling, but seems fast enough, even though I can't tell what downhaul and vang is right.

http://www.bloodaxeboats.co.uk
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redback View Drop Down
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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 07 at 5:25pm

I think it would be very good to try and put together some polar diagrams for some racing dinghies.  Has anybody got any data which we could use.  I have a gestimate of how a laser 4000 performs.  Very much a gestimate based on experience and interpolation with some polars published by Frank Bethwaite.
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I luv Wight View Drop Down
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Posts: 628 		Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 07 at 6:18pm
how about pico racing in 20 kts - max speed at 11.6kts



http://www.bloodaxeboats.co.uk
Andy P
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redback View Drop Down
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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 07 at 9:44pm
I suppose that's a start!
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Posts: 0 		Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 07 at 8:49am
Originally posted by redback

I think it would be very good to try and put together some polar diagrams for some racing dinghies.  Has anybody got any data which we could use.  I have a gestimate of how a laser 4000 performs.  Very much a gestimate based on experience and interpolation with some polars published by Frank Bethwaite.

What wind speed?
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Chris 249 View Drop Down
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Posts: 2041 		Post Options Post Options   Quote Chris 249 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 07 at 2:24pm
I borrowed a GPS at our windsurfing Midwinters last year and scored 25.4
knots max with two 10 second averages of 22.5 (I'm not that slow on fast
gear, this was on a 21kg 12' original Windsurfer).

The owner printed off the numerical readings but i've lost them. He was
then ranked about 8th of the 900 or so sailors on GPS speedsailing and is
a well-respected figure.

So the question is......can we assume the 22.5 for 10 seconds is legit??
Would a spike or similar incorrect reading last long enough to have an
effect over 10s considering the highest speed was 25.4?

I assume it's all legit as there were a bunch of very serious speedsailors
watching and none of them have expressed any doubts about the speed.
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Posts: 0 		Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 07 at 6:42pm
I think it's a matter of lookig at the data and seeing if there are any dubious points ...
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 07 at 10:38pm
Originally posted by Chris 249

can we assume the 22.5 for 10 seconds is legit??

The Moths have done a bit of research on this and this is what they are going for...

http://www.int-moth.org.uk/GpsSpeedLeague/GpsSpeedLeague.htm
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