trolling motor dredge onboard an ROV

[goldmine1]

Hi folks,

I was playing around in my head with the idea of attaching a trolling motor powered dredge onto my ROV for an application I have in mind. The unit I have is 32lbs of thrust and I was thinking of just using a standard Y shaped venturi with the trolling motor providing the thrust for the suction. Has anyone ever seen or heard of such a thing? I'd be interested in some objective input as to what kind of suction I would have and any pitfalls. There's no problem with controlling the motor as I have extra outputs on the ROV and plenty of current from it's on board battery for short dredge bursts.

I just want this as a simple unit, place nozzle over target, hit thrust and in the bag it goes.

 

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[stevemc]

I would say try it in a pool or shallow water. As you know any thrust is going to make the ROV move around a lot. Should work. You could have the propeller in a PVC tube which is then necked down into the Y venturi. Hard to say how much suction it would have, I have worked with PVC suction dredges using powerful water pumps ( 6 1/2 HP, 2" pump), and it is a problem getting all the sizes and angles right so it has enough suction power. But when it is set up right it had plenty. We found that the pressure had to enter at a fairly steep angle( like straight in) and of course the pipe sizes had to be right. We had 2" going into a 3" pipe.

 

[Harvest]

What size is the rob ? I have no problem with my rob and a clearing attachment

 

[Harvest]

That's ROV