Interesting. I've seen videos of people testing those fans. They make a lot of noise and move a lot of air. That may mean they are a good choice for motor cooling IF you have them held away from the motor far enough to use the airflow so there is little static pressure, but they would be a poor choice for an ESC fan where they are mounted in an enclosure right up against the heatsink and will need to work with higher static pressure?While the fan pictures may work for you, just know it’s the wrong type of fan for this job. What you have here is a high airflow fan and it is poorly designed for your purpose. What you need is a high static pressure fan since it is mounted so closely to a heatsink. I can tell by how close the fan blades are to overlapping each other.
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Here is an image of a fan designed to be near a heatsink or radiator. You will notice the large gaps between its blades. This will usually signify its type vs the close overlapping blades of your fans.
I am testing one of those high flow fans to cool the motor on my Notorious, but it's currently -12 C so... can't really get any useful information.