Mechanics and Construction > Mechanics and Construction

Need help with water propulsion

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Murari:
This is one of my first robots and i really havent been able to come up with a water propulsion system to suit my requirements. I was hoping someone could help..

Most of the propulsion systems i thought about like propellers seemed to either disturb the water too much or draw too much power.
Another problem with propellers was that the water is very shallow, only about 3 inches deep.

gamefreak:
heres a random idea that went into my head a few days back  :D, try some sort of pulse system, like the bass of a sound system maybe.

But since i know nothing about the physics of sound other then it travels in waves and bounces off of stuff, and i know nothing about water except that it is H2O and is wet, i dont know if this would work, it would probably use a lot of electricity

Murari:
Sound waves wouldnt nearly be enough to propel a robot boat, especially one running on an onboard NiCad battery :D

I was thinking of someway other than propellers to expel water and push the bot forward, something like a jet engine, only much smaller and one that uses water.

Admin:
How about this?
http://www.cnse.caltech.edu/Research/reports/polsenberg-full.html

or this?
http://images.google.com/images?q=robotuna&ie=UTF-8&oe=UTF-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wi

ed1380:
Will it be in fresh or salt water? If salt water is possible, then you could dry using a magnetohydrodynamic drive. Here is an example. http://www.evilmadscientist.com/article.php/MHDCraft

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