About the sensor prop: I cropped another, new, 5.82" prop down to 120mm for use as the sensor. My recent problems occured on a very well-used sensor, when trying to measure/set very low sensor RPMs. I think this is friction-related; oiling the plastic sensor prop doesn't work because there's no way to keep the oil in.
So I've modified my test procedures - an improvement, I believe. Once I've used the sensor prop to equalize airflow at the maximum RPMs, I record the fan RPMs. And then I use the fan RPMs to guide my settings when running a lower airflow. After all, the sensor is known to be a little non-linear (no matter at equal settings!), but fan RPMs are by definition linear vs airflow.
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Slip1200 12.00V 856sensorRPM 1262fanRPM 42.0dBA 3" (ambient 28.7dBA)
5.87V 66.7%--> 841fanRPM 33.3dBA 3"
Magma 10.76V 856sensorRPM 1565fanRPM 46.5dBA 3"
6.16V 66.7%--> 1043fanRPM 36.0dBA 3"
I think the Slipstream is the clear choice for an exhaust fan where adequate air intake area is provided (and I make sure my computers do provide lotsa intake area). The Magma looks like it should be the clear choice as a CPU cooler on HSs with closely spaced fins. A filter, in effect, restricts the effective air intake. Depending on the filter characteristics, the Magma might well work better as the exhaust.
I don't see one of these two fans as the winner. I think each has situations that are a natural fit. What do you think?