Ducted Brushless Fans for boost?

So i tested the pressure of that 50mm fan. It is rated at
50mm=715W MAX in 25.2V. 30 amps..
I tried it on 5s it made about 1psi with no flow... BUT it got so hot that it would melt down on 5s so it's irrelevant that it made 1psi.. I could do more testing but i dont see there is any point as it gets to hot to every be used no matter the results.
 
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