[PSUBS-MAILIST] Knotstick

[Alan James via Personal_Submersibles]

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 & toa 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 withthe disks range of movement.We could probably adapt this concept & come up with a submarine specificitem. Maybe a clear tube with the disk inside pushing against a spring, with thedisk 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 portto show speed. I had to google images of them to see how they wereconstructed. 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 sleevealong a calibration marked on the cylinder to indicate speed.Alan
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