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Joined: 23 Jan 16
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Posts: 789 		Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Topic: Audio speedo - training aid
    Posted: 03 Jan 21 at 4:08pm
A good while back I posted about an idea of having a audio speedo which beeps more  frequently the faster you go. Anyway didn’t come to much but with the current restrictions and sailing but not racing I have revisited. 

There are more details below but basically it is a piezo buzzer, battery  and a reed switch all driven off an impeller.

Tested it today and will it simply works and is a responsive indicator of speed for all aspects of sailing. Probably of little use to hot shorts but as a middle of the fleet sailor I’m hoping until will can get back to racing will help my restricted sailing. Yes I know I can’t use it for racing 
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Posts: 3400 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 21 at 6:12pm
Very neat and simple, I assume the silver cylinder is a magnet? How slow can you get before it ceases to function?



Edited by Sam.Spoons - 03 Jan 21 at 6:13pm
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Blaze 671 "supersonic soap dish"
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Joined: 23 Jan 16
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Posts: 789 		Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 21 at 6:41pm
Originally posted by Sam.Spoons

Very neat and simple, I assume the silver cylinder is a magnet? How slow can you get before it ceases to function?

Thanks. Yes the silver cylinder is the magnet. Happened to have a nice strong one. I would say that less than two knots it stopped, to be honest I didn’t expect it to work as well as it did and had planned to add an extra set of blades for the low speed but didn’t need to. 
When the boat goes fast the impeller is very much surface piercing and when she accelerated the prop jumped out of the water. My stream testing had the impeller sinking too much  so I added adjust corks to control the depth. Now going to add weight. 
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Posts: 3400 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 21 at 7:08pm
For me I think it would be most useful between ½ and about 6 or 8 knots. I wonder if a torpedo log type impeller would be effective at those speeds? It doesn't have to be accurate as such just represent an increase or decrease in speed through the water. I might see if I can work out a way to machine one out of derlin bar
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Posts: 789 		Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 21 at 7:56pm
Yes I’m sure a torpedo log impeller would be better. The bearings could be be better also, consists of two furniture fixing blocks and a long M6 bolt. The impeller is simply flat 2mm alloy bent in a vice to get some pitch. Lots of development to do. 
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https://tinkboats.com

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Posts: 750 		Post Options Post Options   Quote H2 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 21 at 11:35am
Made me smile - I was an advisor to micro-bit when it launched!
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