I would like to know how does the general equation about propellers thrust look like. How should I calculate the force to be big enough for a lift off? The object (a drone) is located in a spacecraft, which means the gravitational force is 0. Are there more variables that I should concern about? This is about custom made drone, created to lift objects and transport them to some location. Eg. from point A to point B with 1 main, big propeller and two smaller ones on the sides, for turning around, left and right. PS: I require the logic behind all the equations, how they are derived.