I'd appreciate it a lot if anyone could explain how lift can equal the weight of an airplane in flight (Lift = Weight), if these airplanes have thrust-to-weight ratios of 0.3 (e.g. Boeing 747 or Airbus A320)?
In stable flight, commercial airliners with thrust-to-weight ratios of about 0.3; mean that the thrust from the engines is just 0.3x the weight of the airplane. For example, if thrust is 1.0 N, then the weight is 3.3 N. (1.0 / 3.3 = 0.3).
Then, if Lift = Weight was true, lift would also be 3.3 N, the same as the weight 3.3 N. BUT this 3.3 N for lift is also 3.3x the thrust from the engines!! This is impossible. The lift generated by the wings is not observed to be 3.3x greater than the thrust produced by the en engines of an airliner. see image below of airliners - the backwash from the engines is observed to be a lot more than the downwash from the wings. Albeit this is comparing backwash form engines on take-off, to downwash from wings landing. Nonetheless.....
Thrust-to-weight ratios are known and based on verifiable data of engine thrust and aircraft weight. Whereas, Lift = Weight an unproven assumption in almost every textbook (based on Newtons 2nd law of motion F = ma). Therefore, Lift = Weight is wrong: Thrust-to-eight ratios demonstrate that the lift required by an airliner to fly, cannot equal its weight.
Is there any experimental proof that Lift = Weight?