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Audio speedo - training aid |
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tink
Really should get out more Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 788 |
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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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Tink
https://tinkboats.com http://proasail.blogspot.com |
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply 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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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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tink
Really should get out more Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 788 |
Post Options Quote Reply Posted: 03 Jan 21 at 6:41pm |
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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Tink
https://tinkboats.com http://proasail.blogspot.com |
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply 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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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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tink
Really should get out more Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 788 |
Post Options Quote Reply 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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Tink
https://tinkboats.com http://proasail.blogspot.com |
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H2
Really should get out more Joined: 26 Jul 17 Online Status: Offline Posts: 749 |
Post Options Quote Reply Posted: 06 Jan 21 at 11:35am |
Made me smile - I was an advisor to micro-bit when it launched!
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H2 #115 (sold)
H2 145 OK 2082 |
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