corefile wrote:Yes you can rock a Cessna, you can rock any GA aircraft if you have a dude on each wingtip, but that was not the point (or yardstick) of what they are showing in that video. If you were to do that in a Cessna it would keep rocking back and forth a bit after you let go from rocking the wings. Its what’s causes the Cessna to waddle or rock side to side when going over big holes and rocks. It’s the nature of a sprung gear, it’s “simple physics”. The downward force creates energy, that energy is returned as upward force and there is nothing to absorb that return energy so you get the Cessna bounce, or waddle, you are transferring some of that energy back and forth between the left and right gear. What they are showing in that video is that when there is a downward force on the gear, the resulting upward force, or energy if you will, is absorbed by the shocks. So you don’t get the bounce of a true Cessna style sprung gear, or the waddle you get from going over rough terrain. A pint sized Cessna would 1) probably had the opposite tire come off the ground as the gear has no pivot point, and would act more as a lever 2) have keep rocking back and forth after they let go, where as the rv-15 did not, it pretty much came back to straight and level with no rocking motion, Much like how the oleo gear absorbs that return energy. The jury is out on how durable this new design will be, from the pictures the gear box looks substantial, but good on Vans for pushing the envelope.
Those are interesting thoughts, probably a good interpretation.
Listening to what little background commentary I could heard on the video, I assumed they were showing how much the shocks travelled (not very much more than sprung gear).
I am sure as more information emerges and more videos of landings becomes available, we'll soon get a clear picture.
It certainly looks like they are pushing the boundaries in this gear design, which I respect.
Ha!!! Well played! 
