hydraulics?
so how it would work is you would have a 1 by 1 by 1 cylinder that attaches to the side of a block, fuselage and wing, when you click the first time the block will turn green/red and a beam will appear between the cylinder you have placed and a new cylinder, then you will be able to click on another block (as long as the second cylinder is inline with the first) and once you have placed the second cylinder the beam in the center will split into 2 different sizes, the first placed cylinder will have the wider section, and the second the thinner one, once this is done, in the settings there will be the option to adjust where the first section of the hydraulics length (meaning that you can extend/reduce the length that the hydraulic can extend and contract), there could also be an option to set you own key binds to extend and contract the hydraulic, another option is to have it retract/extend to its original length or it to remain its length after pressing the key to extend/retract it (oh and also a hot-key that sets it back to its original length when it has its extension set to lock), the implications of this could be say having more stable, adjustable wings (the angle and pitch) and maybe even the construction of robots (which is exactly what im working on but rotors just wont cut it) etc etc, so please, please, please add this part (because i really want to finish this dam robot)
see: pistons