ORIGINAL: Mode One
However, it's still not recommended that you attempt to fly two airplanes at the same time. I haven't seen anyone try this, and I can guarantee it will not work! I have however, seen someone switch from airplane to airplane, with the engine running, the plane loose on the ground and the throttle servos reversed between the two planes! Don't do this one, either!
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If you are refering to my post, I said using the same profile for two differnt plane, not fly two at the same time. That means that both planes have the same servo reverse settings, same trims, same dual rates, same exponential, etc. This way you can take your 4 model memories and make them applicable for more than 4 planes.
Going back to my example, the Spirit and the Sagitta were both 2M RES sailplanes ( 3 channels ). I redid the servo linkage on the Sagitta for the rudder so that it matched the direction on the Spirit. Then I worked the mechanical adjustments so that both used the same end point adjustments, same dual rates and same exponential. If there were any unique changes I wanted to make to one plane or the other I had to do it via the linkages on the plane, not from the radio.
Making adjustments from the radio is super quick and easy compared to doing it on the plane. But that is how you stretch your model memory count to handle more than that many planes.
Hope that clarifies it.
( flying two at once? Had not thought of that.)