The engines (or thrust) does not support the weight, the wings do that or in the case of a rotorcraft the rotor blades. The engines(or thrust) merely propel the aircraft forwards fast enough for the aerofoil to provide the lift I daresay that if you could sit a 737 vertically on its tail and run the engines at take off power all you would get would be a lot of noise!! and the aircraft would not move this is why vtol aircraft engines are extremely powerful in relation to their weight