# - Help Pls - Ripple Tank

Discussion in 'Electronic Basics' started by jsdmnd, Dec 14, 2005.

1. ### jsdmndGuest

Could anyone please give me an idea on how to build a motor that ca
generate water waves for a ripple tank apparatus

I would like to know what parts would I need and power rating to driv
the motor

Pls make it as simple as possible as I am a true beginner to this kin
of stuff, so any helpful info you people can provide for me is trul
appreciated

Thank you

:?

2. ### Rich GriseGuest

What do you know about ripple tanks so far? Whenever you come up with
a mechanical way of making the waves, you could even use something like
a windshield wiper motor, with an adjustable crank for how far you
want the thing to slosh. That's just off the top of my head, but to
get extra credit on this project, figure out how many joules per
second it takes to move the amount of water you want to move the
distance you want to move it, and translate joules per second to
watts, and 746 watts ~= 1 horsepower. (is approximately equal to).

Multiply that by some factor, typically from about 1.2x to 2.5x,
depending on what kind of losses you need to account for, how much
reserve you want, and that sort of thing.

But off the top of my head, if your tank is significantly bigger
than a pie tin, it's going to take a fairly substantial motor, which
is why windshield wiper motor sprang to mind - it already has the
back-and-forth action you'd probably want, and it runs off 12VDC,
so you have one less safety hazard to contend with.

And you can probably get one for a buck or two at the auto salvage
yard. ;-)

Good Luck, and Report Back!
Rich

3. ### Ken MoffettGuest

Is he talking "ripple tank" or "wave tank". In a ripple tank you just
make ripples and see how they travel, reflect and interfer. A wave tank
is a whole different animal, that requires the power you're refering to.

4. ### Rich GriseGuest

Ah! Then in that case, one could use a clock motor, or a little
solenoid, maybe adapt a relay to just kinda dab the surface. In either
case, the mechanical parts are going to be the most interesting.

Depends on what he wants from his tank.

Cheers!
Rich