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I think you might be right Jboggs. Probably one of those times I need to accept I can't do everything myself.

Hey all, I am in need of a system to lift a ~300ton object off the sea floor. I have had suggestions of using a rack and pinion system driven by an electronic/hydraulic rotary drive unit, or using a multiple stage hydraulic ram with locking pins. What are the pros and cons of the two options...

I assume permanent magnets on the rotor and coils on the stator each protected from the sea by some material that doesn't impede the magnetic field

I came across this and have found myself curious about how it works. http://www.openhydro.com/images.html They build devices up to 16m diameter. As it is air-cored the bearings must be at the rim but I would have assumed it near impossible to manufacture something to the required tolerances for...