NEW VERSION (Now with video):
This new version has bigger bottles, only one motor and propeller which operates out of the water and has a servo that controls the double rudder.
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This is a simple robot boat made of water bottles, polymorph plastic, two motors and propellers, tape, a box, a battery and a motoruino.
It is supposed to natigate on a pool, but I haven't had time to test it properly. I will need to buy better propellers first.
