🍽️ Dishwasher Spray Arm: Jet Reaction Torque, Spin-Up and rpm (2D top view)

Top view of a rotating dishwasher spray arm. Set pump pressure, nozzle size, arm radius, nozzle count and tilt, bearing friction and water drag, then watch the jets push the arm up to speed. Bernoulli jet speed, momentum-flux thrust, spin-up against drag and the share of pump power that turns the arm, with four in-page numerical checks.