We should have Parts in the game that are similar to repulsorlifts from star wars. A part with a Special feature, that keeps the Vehicle its attached to on a certain height, the wanted height can then be changed in part settings. The Repulsor part should also have a certain lifting force that can be changed too, depending on how much force they have, the repulsors would drain electricity/fuel from the craft, how much drained is affected by the force of the repulsor and the desired height.