A motion system for heave is desirable for many forms of motion simulation, but often difficult to implement. @SeatTime came up with a simple idea, use a seat mounted heave plate driven by a motor and lever: http://www.xsimulator.net/community/threads/seattimes-dc-motor-sim.5024/page-7#post-56322



They say the simple ideas are always the best. Here @Pit provides a simple but very effective way to add heave to seat shaker designs, by adding a hinged plate under the pivot point. Follow the pictures and descriptions starting here: http://www.xsimulator.net/community...raction-loss-finished.5276/page-10#post-76305




See it in action:


Here is a compact adjustable spring assisted approach to heave by @noorbeast: http://www.xsimulator.net/community/threads/dx-racer-compact-simulator.5866/page-15#post-83752



Heave is not easy to implement and there have been many different approaches, here @ericRacer uses an air jack: http://www.xsimulator.net/community/threads/my-new-3dof-4motors-arduinoméga-sabertooth.4926/



Another variation of multiple spring assisted heave by @willaupuis: http://www.xsimulator.net/community/threads/3-dof-vertical-heave-francais-anglais-by-google.6344/