I spent years trying to find out that when an aircraft flies or anything works it consumes energy more than it delivers back, means no perpetual motion exists. My query is that when an aircraft is at a constant speed then thrust=drag and lift=weight but why is there no relation ever found b/w thrust and weight, for 747-8
thrust 296 KN is lesser than the max takeoff 448 tons weight hence the thrust to weight ratio is too less.
so isn't the theory of energy conservation being defied.
for an object to be sustained at a height on a pulley system the other side wieght has to be the same.
Please give me a good response thanks in advance.