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Ways to add Heave
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/