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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Rules of the Road, Regulations & Red Tape 08-07-2023, 04:49
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

Responding to a somewhat old post, but still


True Wind and Ground Wind are different beasts.



Ground Wind is meteorological -- very useful to understand bigger trends, and to understand...
Forum: Rules of the Road, Regulations & Red Tape 04-05-2022, 07:45
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

There has been a lot of progress with pilots. If you have decent STW data, and your wind instrument has a high update rate, and your pilot is less than 10 years old, you might find that wind mode is...
Forum: Rules of the Road, Regulations & Red Tape 03-05-2022, 12:13
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

Well, if you use COG for "True Wind" -- and if it's expressed as an angle to the bow, I think it's better to think of it as pseudo-True Wind rather than Ground Wind -- it will be actually dangerous...
Forum: Rules of the Road, Regulations & Red Tape 02-05-2022, 10:30
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

You might try an ultrasonic or electromagnetic one.

I had pretty good luck with the old CS4500 ultrasonic one. You are supposed to antifoul the sensor face, and I had almost no trouble with...
Forum: Rules of the Road, Regulations & Red Tape 02-05-2022, 05:25
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

I often have no choice, as valid STW data has been hit and miss for me since my CS4500 speed log went down a couple of years ago.


Of course, Ground Wind is useful -- it's the actual weather. ...
Forum: Rules of the Road, Regulations & Red Tape 02-05-2022, 04:13
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

There's no inherent reason why you couldn't express True Wind as a compass direction (then it would be TWD) or Ground Wind as an angle to the bow, just that these expressions would not be very...
Forum: Rules of the Road, Regulations & Red Tape 01-05-2022, 17:46
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

Indeed. That is the whole rub. Why I have been friends with my windex all these years despite having dumped tens of thousands into electronics . . .
Forum: Rules of the Road, Regulations & Red Tape 01-05-2022, 13:47
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

The problem with that is that Ground Wind when expressed as angle to the bow is nonsense, even with very small currents, and with big currents fuggedaboutit. Tacks will show wildly different angles...
Forum: Rules of the Road, Regulations & Red Tape 01-05-2022, 13:38
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

Apparent wind (both speed and angle) is what is directly measured.


True Wind is corrected for Speed Through Water and is normally expressed as angle to the bow


Ground Wind is corrected for...
Forum: Rules of the Road, Regulations & Red Tape 01-05-2022, 12:36
Replies: 65
Views: 8,834
Posted By Dockhead
Re: Paddle wheel speed sensor, who needs ‘em!

Indeed! We sail in the sheer between air and water; the ground is irrelevant. In still water, SOG may approximately work, but with a current running all calculations of True Wind angle and wind...
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