I'd appreciate it a lot if anyone could explain how the wings can generate lift that is 3.3x more than engine thrust? Is there any experimental proof that this? Or is the assumption that Lift = Weight wrong?
Given that in stable flight, lift equals the weight of an airplane (Lift = Weight); Some commercial airliners have thrust-to-weight ratios of about 0.3; Here the wings generate Lift that is 3.3 times the force generated by the engine thrust (Lift = 3.3 x Thrust); And do so without using any of the force generated by the engines.
Commercial airliners such as Airbus 320 and Boeing 747, have similar thrust-to-weight ratios of about 0.3. Rearranging this ratio shows that the weight of the airplane (Weight) is about 3.3x engine thrust (Thrust):
Thrust / Weight = 0.3
Rearrange this equation: Weight = Thrust/0.3 = 3.3 x Thrust
=> Weight = 3.3 x Thrust
In stable flight if lift is assumed to equal the weight of the airplane (Lift = Weight) according to Newtons laws (F = ma).
Then combining the two equations (Lift = Weight) and (Weight = 3.3x Thrust):
Lift = Weight = 3.3 x Thrust
=> Lift = 3.3 x Thrust
Then, according to NASA and other advocates of fluid mechanics, the wings generate lift due to the airflow over the wings. Engine thrust is used to overcome drag (Thrust = Drag) and does not contribute towards lift in stable flight.
This means that for every 1 N of Thrust, then 3.3 N of Lift would be created from wings airflows. This is implausible also as it violates the principle of conservation of momentum and energy to produce a net gain of a force (Lift); and so much Lift (3.3x) compared to Thrust. Where does the extra energy used for lift come from?
This proportion (Lift = 3.3 x Thrust) is implausible for many reasons. For example, raising the nose of the airplane (pitch) would provide a net loss of the vertical upward force pushing the airplane up. As the wings generate 3.3x the force of the engine thrust, after the airplane’s nose is raised the upward force from the wings would decline more than the slight increase in upward force from the engines. As Lift = 3.3 x Thrust is implausible, then Lift = Weight is also implausible.
Another example; a Boeing 787-8’s maximum range of about 14,000 km (e.g. New York to New Zealand); It uses about 100,000 kg of fuel to carry a max. payload (aircraft and passengers) of 128,000 kg.  It is implausible that on a 14,000 km flight, the wings create an additional upward force (Lift) that is 3.3x greater than the engine thrust (that used 100,000 kg of fuel on this flight). Where exactly does this extra force and energy come from? Remember, fluid mechanics claims that lift is created without using Thrust (as Thrust = Drag). The force and energy for this lift is a net gain to the system; which violates the principles of conservation of momentum and energy. Therefore, Lift = Weight is implausible.
Thanks in advance!