[PSUBS-MAILIST] Knotstick

[Douglas Suhr via Personal_Submersibles]

Cool concept, thanks for sharing Alan. I'll have to look into one of those,
I like the simplest way of doing things! ~ Douglas S.

On Mon, Feb 8, 2016 at 6:15 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I posted this on the 7th but didn't see it.
> Apologies if you already received it.
> Anyone looked at or used these.
> They record speed.
> http://www.knotstick.com/
> They look like they could be mounted by a side view port
> to show speed. I had to google images of them to see how they were
> constructed. It's a disk on a string that drags through the water. It is
> attached
> to a stainless spring in a cylinder & as the spring is extended it pushes
> a white sleeve
> along a calibration marked on the cylinder to indicate speed.
> Alan
>
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