In this situation it sounds like a simple ram pump lifting the water to a storage tank that then feeds a pelton wheel should do the trick. Think that's the setup Dick Strawbridge built. There used to be a system like that at the CAT in North Wales, perhaps they would be able to offer some advice
A 24" plywood cable reel would make a good hub for a waterwheel?Thanks for all the help her folks. I'm looking to try with an overshot wheel first just driving the alternator from my old car. Just a proof of concept, I won't need to build a dam or weir so dropping it in temp for an hour or so to measure the output before going for the proper permissions should be OK. Obviously I want to build cheap for a trial, could use wood but it would be nice to make something more durable and cheaper that can be tidied up if it is to become permanent later. To which end I'm looking for something like a plastic cable drum about a meter diameter, I know they exist, I have seen photos online. The design I have in mind involves running a V pulley with a root diameter of about 50mm against the rim to give a 20:1 ratio which should get me most of the way to the input speed I need for an alternator, I might need to add a 2:1 sprocket and chain drive as well depending on how fast I can get the wheel to turn.
Here's the cheeky bit - does anyone know where I can get something like that?
Not sure how to make the ply stand up to the water, wooden drums are certainly easier to find but I don't want to rebuild if I can avoid it. I may go down this route for the test if I can't find anything more durable.A 24" plywood cable reel would make a good hub for a waterwheel?
Perhaps channeling water over the top of it into buckets or past in a channel underneath it?
I suspect the former would give more torque???
I'd use alloy lades mounted on the hub.Not sure how to make the ply stand up to the water, wooden drums are certainly easier to find but I don't want to rebuild if I can avoid it. I may go down this route for the test if I can't find anything more durable.