I'm a hand launcher by birth. Can't stand scale planes with landing gears hanging down. Don't want to deal with complexity and weight of retracts. Too lazy to drag out a bungee set up every time I head out to fly. That leaves...hand launch. Prop planes are normally easy to hand launch assuming c.g. and trims are good.
EDFs, however, is another story. I would reference it to launching a highly underpowered prop plane. This thought causes high anxiety with RC pilots resulting in many people throwing like a Shortstop to First Baseman. I did such on my very first hand launch of my first EDF, a JPower 50mm F-18, after having over a year's highly successful experience hand launching various WW2 prop planes in my hangar. That launch resulted in 1 second of air time as the plane rolled massively to the left and crashed before I could even get my fingers on the aileron sticks.
Reviewing the traumatic experience in my mind over and over and over as well as looking at the mechanics of my throw in slow motion, I came to the conclusion that it was not "torque" roll, like a prop plane, as many have blamed it on but it was the position of the thumb and fingers. When throwing a ball (baseball or tennis, etc), my wrist would straighten out to be in line with the fore arm. This causes the thumb to be lower than the index finger at the time of release. Thus, my wrist action (right handed throw) was inadvertently inducing a left roll to the plane. I worked on
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