Next message: Bob Johnson: "lv-ab: anchor rode?"
There used to be a $100+/- gadget for use on dinghies. It
was a wireless speed transmitter and a receiving/display
unit. No idea of the accuracy.
-Rob
--- alex v <> wrote:
> >A bicycle speedometer.
>
> Man, one heck of an idea! Let's try to take it some
> further.
>
> >Epoxy the magnet onto the shaft.
>
> That gives you an estimate based omn shaft revolutions.
> 1. Prop slip varies
> with speed quite a lot; and 2. No good for a sailboat.
>
> How about making an impeller of some sort and trailing it
> behind the boat on
> a wire, just as the Walker Log does (at 20 times the
> price)? I think, one
> could measure the output signal of a sensor and make a
> contraption that
> would do the same without the hassle of a magnet and a
> large wheel. A small
> DC motor, maybe? Cut off all the brushes except one?
>
> However, we are talking about 10 times faster rotation
> speeds, so that bike
> counter may refuse to work.
>
> Alexey
> s/y Tangra
>
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