Very hard to switch amongst tanks, i imagine it depends on POV somewhat but way too difficult. What usually happens is the switch goes to "off" and the engine dies ! Also difficult to see what is going on with cowl flaps, there does not seem to be much indication of open/closed status. Also with regard to cowl flaps, beside open and closed, the old radials had a "trail" position which just let the cowl flaps trail in the wind and assume whatever opening the speed of the aircraft would indicate, I've never seen this on an x-plane model yet... I guess while I am ranting I should mention the yoke, more specifically the ability to turn it off and on for better viewing of the instruments. I realize realism is a priority here but in real life its easy to see the gauges ! Its possible that someone else has had these questions asked and answered but only pinned items in this support forum - how come ? Great plane, fun to fly, looks beautiful, a real nice job, thanks... Terry