How to calculate the thrust of the jet stream "Karcher"?

Question

Physics

Actually, I came across a video in the internet, where the washer tore himself off the ground with two "Kerchers". I don’t have two Karchers, but I still want to figure out how realistic this is.
Actually there is - water consumption (in l / s or kg / s), pressure, power (the unit itself, the efficiency is not known).
Actually how to calculate the thrust created by the jet stream? I suspect that I am missing the initial data ... but what kind?

Answer 1

The calculation is highly speculative.
Let us take the passport pressure equal to the outlet pressure.
1 The volume of water pressed in (squeezed out) under pressure is work.
2 Water flow multiplied by pressure is mechanical power.
3 Suppose that all the mechanical power goes to the acceleration of water.
4 Divide mechanical power by consumption - kinetic energy density.
5 The density of the kinetic energy of the water flow - determines its speed.
6 Speed ​​multiplied by water flow - momentum flow.
7 The flow of momentum is power.
I got:
Force = sqrt ( 2 * pressure/density) * flow
How about you?

Answer 2

Thrust = mass flow (kg/s) * exhaust velocity (m/s)
Plug in and calculate