Velocitek S10 and Action Replays
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=2833
Printed Date: 18 Aug 25 at 8:25pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Velocitek S10 and Action Replays
Posted By: Guest
Subject: Velocitek S10 and Action Replays
Date Posted: 04 Apr 07 at 2:11pm
|
As Velocitek have stepped up to sponsor the Musto Skiff Worlds I thought I had better test a unit. I used it at the recent Rutland Open and it was great on board but the analysis of the data post race and the facilty to replay the race is great. Just imagine what this would look like if all the boats had the unit and uploaded their data to a website (perhaps Y&Y.com) - on Monday morning you could review the race; see where the leaders went; where the wind bends are; who got the gusts and shot of downwind etc etc. At the worlds we will run some post race replays ... Here is a link to an on-line replay. (You need Java Run Time installed, follow the instructions) http://www.mustoskiff.com/reports-and-news/2007/replays.htm - http://www.mustoskiff.com/reports-and-news/2007/replays.htm Here is a screen shot for those who fail with the java install for what ever reason.
|
Replies:
Posted By: k_kirk
Date Posted: 04 Apr 07 at 3:06pm
|
Rick, This is super. I have the S10 and have been playing with the GPS action replay installed on my PC but the web based approach you demonstrate make all the difference. I am very impressed and yes, I agree, a post race review of multiple S10 tracks would be wonderful. I wonder how the wind dynamics could be incorporated in the mix. The GPS action replay software seems to cater for the wind data but how to get it in there is the question. Any thoughts? Regards |
Posted By: MRJP BUZZ 585
Date Posted: 04 Apr 07 at 3:18pm
Thats awesome, i HAVE to get one see where i go wrong in a race ------------- Josh Preater http://www.bu22.co.uk">  BUZZING IS FUN
|
Posted By: Guest
Date Posted: 04 Apr 07 at 3:26pm
The GPSar application is very comprehensive and I am yet to get my head around all it's capabilities; I was hoping others with more knowledge would contribute to this thread and share more thoughts. ------------- |
Posted By: landlocked
Date Posted: 04 Apr 07 at 9:04pm
|
couldn't get it to work with firefox all that happens is the speed in the top left of the screen changes from 15 to 16 and backagain very fast i must be doing something wrong
------------- Cherub 2535 "Eggbert the Nasty" Soon to be for sale PM for Details Cherub 2657 "Slippery When Wet" Don't sail fly Cherub |
Posted By: Guest
Date Posted: 04 Apr 07 at 10:07pm
|
As it says on the page this only supports IE; I know there are issues with FireFox, this is down to the GPSar Java script; sorry I can't fix that ... Try with IE ... ------------- |
Posted By: landlocked
Date Posted: 04 Apr 07 at 10:13pm
|
would do but have wiped from the system cause it sucks will try it on a mates computer at a later date
------------- Cherub 2535 "Eggbert the Nasty" Soon to be for sale PM for Details Cherub 2657 "Slippery When Wet" Don't sail fly Cherub |
Posted By: I luv Wight
Date Posted: 04 Apr 07 at 10:21pm
|
Or maybe for those of us who have GPSAR installed ( cos we've already got an S10) you could just post the .gpx file, and we could then open it and run it.
You can set the wind direction on the water, and change the upwind and downwind points ( or really reset the wind line ). You can also adjust the wind direction on the replay by twiddling the windsock, if the direction isn't right. The MPS tracks don't agree with the wind sock wind direction - the wind should be about 0° - it's set at 20°. Are you getting those 25kt spikes because the S10 is on the boom? The yellow track is much spikier. ------------- " rel="nofollow - http://www.bloodaxeboats.co.uk" rel="nofollow - http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling |
Posted By: Guest
Date Posted: 04 Apr 07 at 10:38pm
|
Still learning how to use the GPSar app; how do you actually set the wind direction and how is it built into the gpx traces? The S10 was on the mast but the boat bounces quite a bit perhaps that is the cause of the spikes? ------------- |
Posted By: I luv Wight
Date Posted: 04 Apr 07 at 10:46pm
But yellow is more spiky? The program is not that easy to understand or use to it's fullest - there's some bits i just don't get! I think that if you save the track after adjusting the wind with the windsock, the new saved track has the new wind direction. The original data - .vcc has all the info in text form, lat,long, timing, etc, so you can see what's going on. ------------- " rel="nofollow - http://www.bloodaxeboats.co.uk" rel="nofollow - http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling |
Posted By: Guest
Date Posted: 05 Apr 07 at 8:47am
|
What are the other graphs at the bottom? ------------- |
Posted By: Guest
Date Posted: 09 Apr 07 at 7:10pm
|
Here is todays trip (drift) in the National 12 ... http://www.mustoskiff.com/replays/2007/whitstable-n12/gpsar.html - http://www.mustoskiff.com/replays/2007/whitstable-n12/gpsar. html ANyone worked out what the other graphs a the bottom are? ------------- |
Posted By: bustinben
Date Posted: 09 Apr 07 at 9:13pm
|
I don't get it - how is this different to any cheapo gps (or mobile phone if you've got one with GPS) that you could just stuff in your pocket/waterproof pouch?
Maybe I'm missing something... It is just a gps isn't it?
|
Posted By: Guest
Date Posted: 09 Apr 07 at 10:29pm
|
It's a GPS with a large digit speed readout and a VMG feature. You of course can track your progress with any GPS but the Velocitek gives you much more when you are on the water in terms of display and feature. Designed just for sailing. ------------- |
Posted By: redback
Date Posted: 09 Apr 07 at 10:55pm
| A fantastic piece of kit. Did you say you can plot polars, if so I'd be interesed in seeing some. |
Posted By: redback
Date Posted: 09 Apr 07 at 11:08pm
| The graphs at the bottom are plots of various parameters. I ticked one of the boxes at the top right and got the VMG in the graph at the bottom. You need to set the wind direction on the wind sock to get the correct VMG. I guess you set that on the instrument at the venue but you can change it whilst veiwing the play back. |
Posted By: Atum Bom
Date Posted: 10 Apr 07 at 1:20pm
|
http://www.sailingsource.com/cherub/appletGPSAR/gpsar.html - http://www.sailingsource.com/cherub/appletGPSAR/gpsar.html This is one of us burning about at QMSC about a year ago. -------------  B
http://www.uk-cherub.org - www.uk-cherub.org |
Posted By: Skiffe
Date Posted: 15 Apr 07 at 11:28pm
|
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.
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. ------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: Skiffe
Date Posted: 15 Apr 07 at 11:31pm
|
And if you look here http://www.sailinganarchy.com/forums/index.php?showtopic=51619 - http://www.sailinganarchy.com/forums/index.php?showtopic=516 19 there is a thread about the 12 nationals with about 5 S10 with speeds ------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: Guest
Date Posted: 16 Apr 07 at 10:10am
|
Nice one ... How did you convert from GPSar to somthing you can load on YouTube? Also - how do you make the tracks erase as they age? ------------- |
Posted By: MRJP BUZZ 585
Date Posted: 16 Apr 07 at 11:02am
Thats pretty good, I like the colour changes for different speeds ------------- Josh Preater http://www.bu22.co.uk"> BUZZING IS FUN
|
Posted By: Ed B
Date Posted: 18 Apr 07 at 1:21am
|
Video Screencapture of GPSar (Google "SnagIt")
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. |
Posted By: I luv Wight
Date 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 - 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. ------------- " rel="nofollow - http://www.bloodaxeboats.co.uk" rel="nofollow - http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling |
Posted By: redback
Date 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.
|
Posted By: I luv Wight
Date Posted: 07 May 07 at 6:18pm
how about pico racing in 20 kts - max speed at 11.6kts
 ------------- " rel="nofollow - http://www.bloodaxeboats.co.uk" rel="nofollow - http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling |
Posted By: redback
Date Posted: 07 May 07 at 9:44pm
| I suppose that's a start! |
Posted By: Guest
Date Posted: 08 May 07 at 8:49am
What wind speed? ------------- |
Posted By: Chris 249
Date 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. |
Posted By: Guest
Date 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 ... ------------- |
Posted By: JimC
Date Posted: 08 May 07 at 10:38pm
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 |