So tell me Ron, how does this wattmeter work? How does it measure watts? To my knowledge (BSEE in 1969, MSE in 1974) watts cannot be "measured", they are calculated by measuring volts and amps. Show me a wattmeter that has a "Watts" input port.

BTW, while your info is informative it has nothing to do with his request. He is not flying a plane. He wants to terrorize pedestrians by strapping EDFs to his back and race down the sidewalks on a skateboard. Or worse yet, race down the streets.