Something new coming out of Tyng Labs. Lets see if a water pump impeller from Kawasaki 250 can be the basis for a kick ass bilge pump. No flimsy resin molded or 3D printed stuff here. Cast and machined aluminum and designed like a centrifugal pump impeller should be! I modded the impeller, shortening the blade height, sacrificing flow for higher pressure. Still working on the hub bit. It's a bolt through drilled to 1/8". Will get started on the case shortly. ...
Started fabbing the case. The case is machined out of a laminated block of PVC plastic lumber. The 1/4" outlet tube press fits into the case. I'm trying to get minimal ID changes as possible to get as smooth a flow from the case to the restrictor. Flattened the hub nut Drilled and tapped the setscrew hole The business end The impeller is tapered on the bottom. I chucked it up in the drillpress and used it to drill out the bottom of the 1 1/2" hole for a perfect fit. ...
We will see. I think the 1.5" impeller may be a bit to much for the RS555 motor. If it seems to be under performing, I'll machine a 5mm hub for it and mount an RS775 motor and test.
Wait, Steve found an application where the RS555 isn't ideal? I'm assuming you tested up to 1,000V, right?
Pumped some water today. Pushed a gallon in 32 seconds so right now I'm calling this a 2GPM pump. That was through a plain jane restictor though. The motor sounded a little bogged but it didn't get hot, warm, but not hot. I have an amp meter coming in the mail this week so I'll be able to get some real testing done. Will also have a better restrictor for the next test. One nice thing with this pump was that it primed in a 1/4" of water and sucked that container practically dry before losing suction.
Well, I tested the new pump against my current Barham pump. Both pumps have the same motors. Turns out my old pump does pretty well. It pumps a gallon 3 seconds faster than the new one and uses half the current (2A vs 4A). Go figure. I do like the nozzle on the new pump though. It has a better stream. Think I'll make a copy and adapt it to the old pump to see if it improves it. On the new pump, I'll try a 755 motor on it next.
