All Phil and I got together this past weekend for some building. I am not sure just how much either of us got done on our boats, but we were able to get some serious pump motor testing done. Here is some of the results. Large pump motors. Nate has found a 12 volt 550 size motor that is less powerful than the typical 550, but also draws a lot less current. He sent me the web-site info for the motors, and I will try to post it here. We mounted this new motor to all of the large pump housings that we could find. Phil even found an old Swampy large pump laying around. 6 volts with a 1/4" outlet... .43 amps pumped 1 gal in 1 min. 8 sec. 12 vts with a 1/8" outlet.... .55 amps pumped 1 gal in 1 min. 40 sec. 12 vs w/ Dave's 1/8" outlet.. .50 amps pumped 1 gal in 1 mim. 22 sec. 12 volts with a 1/4" outlet.. .52 amps pumped 1 gal in 40 seconds. I am going to order a large batch of these motors and will stock them. These could very likely solve one of the problems that we have been experiencing over the last couple of years, where we run into issues with clogged outlets on the pumps crossing over from the fast-gun clubs, when we tried to reduce their output by shimming down the restrictor outlet. More later. Mikey
In addition. We also did some tests on some of the smaller motors that we have been able to find. Two motors stand out. One is a small version of the very popular Wah-ming motor that some of us are using for drive motors in our ships. Well this smaller version is approx. the size of a 380, but runs very smooth, and draws very little current. It is rated up to 12 volts. Another is a small 380 size motor that we have found locally at an electronics place. It comes with a black rocker type switch on the leads. Black rocker motor. 6 volts with a 1/4" outlet Alan's small pump housing ... .75 amps pumped 1 gal in 45 secs. B/C's cruiser pump housing... .65 amps pumped 1 gal in 50 secs. B/C's micro pump housing .... .30 amps pumped .75 qts in 1 min. Mini Wah-Ming on B/C's small housing, and Alan's. 6 volts with a 1/4" outlet .. .50 amps pumped 1 gal in 1 minute. More later. Mikey
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Phil is over just now, and here are some more pump testing results. New large motor, on a B/C large pump housing. No restrictor. 7.2 volts 1 gal in 45 seconds, drawing .55 amps. That is just under a battleship pump. Using a 3/16" restrictor.. 7.2 volts 1 gal in 1 min. 45 seconds. 12 volts 1 gal in 50 seconds. The mini-wah-ming motor on a B.C. cruiser housing. No restrictor. 7.2 volts 1 gal in 55 seconds, drawing .57 amps. 12 volts 1 gal in 30 seconds. More later. Mikey
At the Xenia event, Phil was running the new 12 volt 550s on both his drive (direct), and pump. He did mention that his drive motors did get warm after he got mossed. I was running my old Wah-Mings on my drive (direct), but my pump was one of the new 550s. I did feel the need to put three very small vent holes in the pump housing, as the pump didn't always draw-up either after being shut off, or after pumping out. We were both running 12 volt systems. I had absolutely no problems with my pump, and it draws less than an amp, and had a 3/16" restrictor. Compare this to my pumps in both the Renown, and Strasbourg, which were using a 12 volt 550 can motor that had twice the rpm. They also pump 1 gpm, but with a 7/64" outlet, which is really small, and draw over 4 amps. I will, as time permits, be changing out my old pump motors for the new one. Mikey
Very good info. I wish there was more info out there about efficient 6v systems though. I'm not a 12v fan.
I think the motors will work fairly well as direct drive motors on 6v. At least that is what I'm hoping for on the Gascogne.
The question then would be this. If a skipper is running a 6 volt system, and wants a pump motor that draws less than say 4 amps in order to pump 1.25 gpm through an outlet approx. 1/4" or less, then what motor would they use? I think a Dumas-Pitman 6 volt motor would do the job, but also costs over 30.00. They are super efficient, and fairly low rpm. Mikey
