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Old 13 June 2013, 11:27   #111
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Originally Posted by PGIC View Post
I didn't shoot it down. I think it is a great idea. I merely said I had put forward a similar idea on our site on multiple occasions trying to interest the industry in pursuing it and had especially promoted it back in 2007 when the technology was making some advances.
If you are so interested in these technologies, rather than advocating for someone else to do something why don't you actually make something for aftermarket installation? At least as a proof of concept prototype if not actually for sale to the public.

Originally Posted by jyasaki View Post
I wonder how you'd differentiate between say, a human leg and a fish or log or some other thing nearby?
I don't know. The table saws I linked to earlier can tell the difference between damp wood and a finger before its cut off (which is pretty impressive to me honestly).

I suspect the conductivity of seawater would make similar detections of human limbs challenging but I'm not savy to the possible engineering.

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Old 14 June 2013, 16:59   #112
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
The sawstop uses a charge on the blade, and detects the change in signal when it contacts skin. They stop the blade in a couple of milliseconds or so if it comes in contact with a finger, or, as in the demo, a hotdog held by a person (never seen it, but I doubt it would work on just a hotdog alone.) Braking is done by shifting a block into the blade (destructive braking - the entire brake subsystem has to be replaced.)

This likely wouldn't work on a prop immersed in water.


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