[PSUBS-MAILIST] Knotstick

[Douglas Suhr via Personal_Submersibles]

I like the idea! ~ Douglas S.

On Mon, Feb 8, 2016 at 9:41 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Doug,
> to adapt it to a submarine you would need to do something like
> house the disk end in a 3" diameter piece of plastic tubing.
> You could attach a fine nylon line to the back of the disk & to
> a hole in the pipe to stop the disk drifting out & tangling somewhere.
> Make sure there is enough slack in the nylon that it doesn't interfere with
> the disks range of movement.
> We could probably adapt this concept & come up with a submarine specific
> item. Maybe a clear tube with the disk inside pushing against a spring,
> with the
> disk moving along markings on the tube.
> Alan
>
>
> ------------------------------
> *From:* Douglas Suhr via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Tuesday, February 9, 2016 3:07 PM
> *Subject:* Re: [PSUBS-MAILIST] Knotstick
>
> 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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