Hi Creaze, As well as the 'breaking the wings off' there is also the 'throwing the engine out of its mounting' to think about if you exceed the max allowable G forces.
At speeds below Va it is impossible to achieve that amount of G force.
With a heavier plane that G Force Max occurs at a higher speed.
You need to study the V-n diagram to understand what is possible at what airspeed. (page 299 in '4 The Airplane - Technical')