do335a

I have always seen the need to be able to stop the engine, in the air (in case of a runawayengine/jammed throttle) or on the bench. Ya never know when someone will flip your prop just for fun or whatever. There are other ways to actuate a switch to kill the ignition, like using a wheel collar or servo arm on the throttle push rod to actuate the switch in the throttle off position. I have seen this used where a spare channel was not available, but I don’t like this arrangement for me.
Another concern of mine is that only plastic (non conducting) push rods should be used for throttle or ignition switches and the receiver and all its servos, batteries and wires should be kept as far away from the engine and ignition as possible. Just IMHO.
BTW, I just finished weighing my Super D with an electronic fish scale, and previously I figured that it was in the 20 - 22 lbs range but it turns out to be 18-3/4 lbs. Still a heavy old bird, by she flies well with the Quadra 42 and a 18-10 prop