I am workng on an autonomous boat that can dynamically hold position using gps. the key to making it work was discovering car windscreen washer pumps with dual outlets. these pumps can be found online for less than £10 and run best at 12-15v. basically if you spin them one way it comes out one nozzle, spin it the other way and it comes out the other one, this is originally used for a cars front and rear window washer but it works ideal as a high-pressure water jet manoeuvring system without any external propellers or drives that can snag, i though this might be usefull to anyone wanting a compact way of adding bow and stern thrusters to their submarines. I originally started using car washer pumps on my nitro boats years ago for when the engine cut out on the pond I could use it as an auxiliary jet drive to make it back to the side of the pond. Because it used 6mm water inlets and 4mm outlet there was very little extra drag.


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