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Protrim speed indicator
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Femto View Drop Down
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    Posted: 11 Jun 05 at 3:28pm
Originally posted by Guest#260

I had one of  those sitting in the garage, just sold it on ebay last week;

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=715 9797234&rd=1&sspagename=STRK%3AMESO%3AIT&rd=1

 


Strange you should mention that- I brought it!! Great fun toy, but still no substitute for boat-on-boat paractise. As to drag, the impellor is pretty small and hydrodynamic.
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Posts: 0 		Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 05 at 1:31pm
Originally posted by Femto

Originally posted by Guest#260

I had one of  those sitting in the garage, just sold it on ebay last week;

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=715 9797234&rd=1&sspagename=STRK%3AMESO%3AIT&rd=1

 


Strange you should mention that- I brought it!! Great fun toy, but still no substitute for boat-on-boat paractise. As to drag, the impellor is pretty small and hydrodynamic.

Small world on-line

You'll be able to answer the question about if it's any good then as I never got round to using it ...

Looks like a good gadget; the function that showed how long it took to recover speed after a tack looked pretty handy ...

regards,

Rick

 
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14niner View Drop Down
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If anybody has one of these to sell please  PM me!

Chees

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lozza View Drop Down
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Posts: 262 		Post Options Post Options   Quote lozza Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 05 at 11:30am

Oi!

Wait your turn

 

Only kidding , but i did ask first!
Life's a reach, then you gybe
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14niner View Drop Down
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Posts: 19 		Post Options Post Options   Quote 14niner Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 05 at 4:56pm
Originally posted by 14niner

If anybody has one of these to sell please  PM me!

Chees

Contact SSailor for payment too . He will not mind!
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14niner View Drop Down
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Posts: 19 		Post Options Post Options   Quote 14niner Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 05 at 5:01pm
Originally posted by lozza

Oi!

Wait your turn

 

Only kidding , but i did ask first!

What do you sail?

Have a look on ebay for GPS fitness watches, the type that tell fat people how far they havent run.

Less drag, and 

THESE WILL BE AGAINST ALMOST EVERY CLASSES RULES!!! 

But if its a watch they will never know

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category =14946&item=5781185605&rd=1

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category =75230&item=7162872575&rd=1

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category =75230&item=7160823474&rd=1

Apparently they tell the time aswell.

 

 

This will not help you pull though :|



Edited by 14niner
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alex650 View Drop Down
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Well I have tried and it doesn't work for the same reasons tuning on a boatspeed indicator doesn't work. If you turn the damping to something around seconds, the VMG dances all over the place. If you turn the damping to minutes, the breeze is never 100% steady for that long. Not all hand-helds let you change the damping anyway but the units yachts have usually do. The point is changes you get from tuning are very small compared to the changes constantly caused by other factors.

The only way you could make it work is record all the data (breeze speed & direction, speed, VMG, sheet settings, rig settings) and shoreside, feed it into a computer, average it out over weeks of testing and try to make sense of it. That is what the AC teams do but it is completely outside the resources the rest of us have available

Stefan,
Sorry to disagree - but actually this is possible on a yacht (or boat with batteries) without spending too much money - certainly not AC levels of money

All you need is
1) PC (or perhaps a handheld computer that can install PC software) - has to work on the boat

2) An NMEA output from a yachts' log and GPS etc

3) Some polar generation software like http://aquilon-performance.com/ - £200 (300 Euros)

This software will firstly get all your polars organised (assisting with performance analysis between sails and settings) - and also, when racing, allow you to work out how you are doing against the polars.

The software outputs 2 figures - one a "live" percentage (however very impacted by waves and micro changes in apparent wind direction / speed) - and a rolling percentage calculated over the last 60 seconds (used for tuning)

If you are not allowed computers on board while racing, you can just take the paper printout of the polars formed while training... and this is still helpful.

(This software is used on a number of UK solo offshore boats - including Sam Davies on her Figaro)

You can also use the polars to assist with navigation routing - as they can help deduce downwind gybing angles - and for decisions about which side to pass islands etc.... I admit this may not be too helpful for dinghies though! (although you can always analyse a race - and work through all the options - and base your on the water decisions from the previous analysis)

Alex
2007 Mini Transat campaign - follow Alex's campaign news...
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lozza View Drop Down
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Posts: 262 		Post Options Post Options   Quote lozza Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 05 at 8:50am

I sail a 505 and an RS300,

If the garmin GPS are so good, why are you interested in the protrim?

Also, the idea is not to race with the speedo, just train and improve tacking/gybing techniqus.

 



Edited by lozza
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14niner View Drop Down
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Posts: 19 		Post Options Post Options   Quote 14niner Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jun 05 at 9:36am

Didnt say they where so good did I?

Just pointing out an alternative.

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