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Even if this assembly is maybe too weak for the pump, just make the flow indicator and use it to shutdown the rig if there is no flow...
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Yes, one of my goals is to add protection against pump failure. But this type of monitoring can't be done in passive mode, it has to be the pump, not just a sensor.
The fan was rated at .36 amp at 12v (4.3w) Is on the weak side for a pump, but it can be a lot more efficient than common ac pumps as it rotates always in the same direction. If this one is successful, I'm going to make a second one with the most powerful fan with sleeve bearings I can find.
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As for your impeller, you'd need to know what kind of force this motor is capable of. Your best bet at this point, would be to try a few basic designs:
#1: the straight paddlewheel
#2: the curved paddlewheel
You'll have to try them at various sizes.
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That 4.3 w should say something, but I don't know the tipical efficiency of this type of motor.
#1 is discarded. Is only good for bidirectional rotation, but not very efficient.
#2 is what I want, but look at the variables:
-Impeler diameter
-Number of blades
-height " "
-Lenght " "
-Angle " "
Suppose I choose 3 values for each one. That makes 3^5 options; 243 impellers to make!
I prefer to make some calculations first and build only one, but don't know how.
