Here’s a video clip of the behavior. Note the brakes are ON when I first glance down at my feet. Watch as I lift and apply them with no apparent effect on the aircraft.
(Look at the tire marks in the “gravel” from my last attempt! Those look like, what, 6 inches deep? What is that, mud? Is that why I’m just sliding through it? There is zero adhesion in slippery mud??)
