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Originally Posted by mechanicalbrain
You know last month I went to an aquarium and I spent a bunch of time looking at the mammals (dolphins, sea otters, and sea lions) and all i could think of was "Good god thats fast" after seeing that video I posted on the robotic fish I think it would definitely be the way to go. It seems to me that you get superior speed and maneuverability at high speed. I made a design for a underwater robot and its three on my things to do list.
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wow as i was read that I had an awesome propulsion idea, if you have something shaped like a fish but simpler like an ellipsoid or a extruded ellipse it would make it fast(hopefully). You would just have like a pneumatic cylinder that would move back and forth, but on the cylinder you would have a fin type thing that would hing only like 90 degrees. Now when the pneumatic cylinder pushes forward it would go along the body and be flat(no drag) but when it pulls it would hing out from the water an hopefully pull the fish.
I an uncertain whether it would work good or not, but it would be worth a try because the same type of things work with fish(I think, I am no marine biologist)