Finally got closer to the balance between functions and performance after several modification. easy control , versatile, outstanding shock-resist ability. no much advanced operation in the sea, but is well enough. fully advanced on-land performance, good flying design,with brilliant landing capability. !!!!!! must read: I always feel like a fool when facing the complex control of enormous AGs, it might be the same for you all ,so I just make the best use of VTOL ,trim ,Ls and R s. P.S. rocket-pot-sss: as usual. riding-in-cockpit/road racing: VTOL bottom +trim bottom.(pull both two rods to the bottom, gas on ,start going.) sacrifice a bit of stability to speed up horizontally: move the VTOL from bottom gradually to the middle. take off: VTOL top (trim middle if necessarily),then pull the trim to move on , or push to go backwards. (Explanation: VTOL top means push vertically off the land, bottom to the land. trim: another group of propulsion ,bottom to go ahead , top to pull over, and middle for some power to help push you off the ground as VTOL top does. pitch ,roll , yaw are all operable with very precision from many tests.)