Jkb Thanks for the information. I was planning on using the complete axle assebly and differential from a large earth mover with plantery gears located at the wheel. I whated to use the massive bearings hub and drum along with the wheel rim to build the water wheel to. I thought that I could remove the 85-140 gear oil from the planatery gears and add a light mineral oil. Then I would do the same thing for the ring gear and pinion and use the output from the differential to drive my crank shaft which would be connected to a mid point bearing. The assembly I have came from a 400 H.P. Military Surply Clark 290M A4-wheel drive articulating tractor. You can view the tractor at my website at www.clark 290m.com. Everything is matched and I dont think the waterwheel will produce enough h.p. to break anything. I know there will be some frictional loss but I will have a 19.5 to 1 gear multiplier to start with. What is your thought on this????? I was going to mount the complete axle assembly upside down on a couple pieces of 18 inch wide flange beam at 50 lb per foot runnning horizontal with the vertical supports concreted into the ground. Did spend two hours last night studying Ram Pumps. Quite simple and seems very inexpensive to construct to move water. Might be cheaper to build two or three of these out of larger pipe???? Use water wheel to produce something else?