Help with water speed please

[Jerson]

This seems an interesting possibility though it is currently used as an air flow sensor

http://www.edn.com/design/sensors/44...-a-flow-sensor

[Acetronics2]

Hi, Jerson

Halas, this measuring principle has to be used only with gases, as the heather power must be somewhat reasonnable:

Water would need 700+ times more power than air ... @ same temp rise.

Ultrasonic measurements also could be made ... but it needs meters between sensors !

I believe the best @ this scale, is to use an axial floweter ( with a small propeller inside ).
I got one years ago for gasoline, from a JAEGER brand car onboard computer ( Years 75-76 , when oil began to cost a lot ... )

it sure must still exist somewhere ( probably Water flowmeters for camping cars ... )

http://dx.com/p/hs05-high-precision-...r-white-227090

The real advantage here is there are no flow change ( and no false measure ) when the sub makes a sharp turn ...
as pitot tube needs to be close to flow direction ...

Alain

[Ramius]

Thanks Guys!
Some very interesting ideas! There is not a lot of room in the bow of the sub as there are torpedo tubes, missile tubes and bow plane mechanics so the intent is to keep everything as small as possible.

Happy Holidays to all! Ed

[Demon]

You want something like these:

http://koolance.com/ins-fm16-coolant-flow-meter

They have a link for the fittings, depends on what size tubing you will use (they also have tubing).


About plumbing, to avoid corrosion:

Do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system.
Do not use silver with nickel in the same system.

Robert