Anybody ever fool around with one of these? The flow rate insn't all that but it's small, efficient, sealed, and cheap ($26). Thought it might be a viable option for class 1 boats. Steve Tyng Rated voltage: 12V DC Rated current: 0.34A Capacity: 1.5L/Min (24GPH) Pump head: 1.6M Noise: 10cm Working temperature: -40C ~ +100C Service life: 26000 hours up Motor: DC brushless motor Pump: Centrifugal pump Weight: 50g (1.8 oz) Inlet OD: 9mm (0.35 inch) Outlet OD: 7mm (0.28 inch) Dimensions: 32 x 26 x 36mm (1.3 x 1.0 x 1.4 inch)
Ebay: http://cgi.ebay.com/ws/eBayISAPI.dl...K:MEWAX:IT This one looks like it might make a good battleship pump: http://cgi.ebay.com/ws/eBayISAPI.dl...K:MEWAX:IT
Another source for some very small (and cool) micropumps for those with deep pockets: http://www.micropumps.co.uk
Actually, I have one of their pumps that's rated for gases to use as an air compressor on my I400. When I bought it (several years ago, admittedly), it was like $48.
That's one interesting pump you've got there. I wonder how it compares to mine? That is basically the guts of an HS-81 micro servo on top of a very basic PVC housing and impeller. I used this to great success in the SS Willie Maykett, where it kept her afloat with two 1/4" holes in the red during one battle.
Decided to take a look at what was available in a smaller windshield washer pump. This one for a Jeep Wrangler looked promising so I picked it up for $15. I'll be trimming it down to size and doing some flow testing this Friday. Out of the box the pump is 3" long. Removing the suction tube will take that down to 2.25". The pic is a bit distorted, the motor can is a 1 1/16" in diameter, What I liked about this pump is that the power tabs are on the side, reducing installation height. A look into the suction shows a molded in debris screen. All this will be sawed off for testing. Unlike most windshield washer pumps this one can be disassembled. The impeller isn't exactly a high performance design. The impeller is a slip fit onto a D shaft. The shaft seal along with some sealant around the motor can should make for a fairly waterproof device. Opened the motor can and was pleasantly surprised by these big beefy carbon brushes and substantial bushings.
Made some mods to the washer pump and tested. At 12v and through a 1/2 unit restrictor (3/32") was getting .83 gpm with a 2.5A draw. Approximately half that at 6v. Got the length down to 2 1/8".
At 6v the pump got warm to the touch but not much more. 12v was definitely hotter. The plan right now is to run the pump on an ESC with a normal setting of 50%, and only push it to 100% when needed. I'm also thinking of a cooling jacket. I was going to use the BC micro pump but the impeller looks weak and it wasn't true or concentric. Also, I'm running 12v and BC couldn't tell me the specs on the included motor, only that it was a 6v motor. The washer pump is better made, rated to 12v, and spares are available at most auto parts stores for $15 each. After my mods its also a smaller form factor than the BC pump. If all else fails, I can adapt a different motor to the pump. Steve
