EAS
Member
might have a look at this
https://fanjetsusa.com/product/gt-power-tachometer/
Generally speaking, static thrust and RPM on a stand will be lower than can be expected in flight.
Of course, momentum will add to the thrust....and rpms too. I can't say how JP Hobby came up with their specs. They don't say anywhere on their sight....that I found.
Torque would also be helpful to my questions,but I'm not expecting to come up with that number. I know a bit of geometry, but that's about it. If I knew rpms I could calculate Propeller tip speed, but that about as far as MY math goes.
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