sorry, no - gravity does not determine the forces that an aircraft engine can generate

there are two ways to address this:

1.  the lift you can theoretically get from an aircraft wing

2.  the thrust or torque that an aircraft engine can generate

gravity plays a small part in the lift that you can generate, as a downwards force, but the Bernoulli equation for incompressible fluids (of which air is with a Mach number under .6) is the determining equation here - the lift generated is the result of the pressure differential across a surface (and gravity is taken into account in that equation)

gravity plays no part in the equation of the thrust or the torque that an engine can generate - this is limited by the efficiency of the compressor, which is dictated by its mechanical design and the physical properties of the fluid (air is considered to be a fluid) being used