If, on the downward stroke of Jiff's rotor system the rotor is consistently accelerated and on the upward stroke no change in angular momentum is achieved, then the machine will produce an upward thrust.
However, this will mean that the rotor will have to continuously accelerate to an ever increasing velocity.
Furthermore, by Newtons third law, any upward thrust would be equal and opposite (at best (less efficiency losses)) to any downward force generated by the propulsion mechanism.
Therefore there will be an upward thrust but never enough to elevate a machine containing the rotors generating the thrust.
Unless Newton is wrong or a bigger bag is used
