Next message: Richard Goodwin: "Re: lv-ab: Speed Through-the-water"
You'd probably catch a lot of fish too! :-)
Richard Goodwin wrote:
> If you use a metal strip twisted lengthwise as the impeller, and just
> let it out on a line off the back of the boat -- like any taffrail log
> -- then all you need to do is find some sort of wheel you can tie the
> onboard end of the line to, and the impeller will spin the wheel. By
> giving the metal strip more of less twist you can calibrate the speed of
> the wheel with respect to the boat's movement through the water. Then
> the bicycle pickup can go right on the wheel. That's a good idea about
> a bicycle speedo, as long as it doesn't take much force to drive it.
>
> The other idea is good too -- have the line drive a small permanent
> magnet electric motor, and use it as a generator. Just hook up a volt
> meter to it, and calibrate it, and you have a speedo. Calibration would
> be easier since you could do it electronically.
>
> Dick
>
> > 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?
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