ORIGINAL: Pat Roy
At reduced rpm levels it's possible to put the mains on the ground and hit the prop with a dash of down elevator. Odds are high that should an engine have the engine cut in flight from a choke or optical switch the prop would get broken in the ensuing rush to get the plane on the ground, along with some bent landing gear.
Haha never thought of that although you wont see me trying that with $70+ props
Personally I like the Smart-Fly system and use it on all my big planes. I have had a muffler come loose or fall off a couple of times, lost throttle servos and been stuck where I was too fast to land and couldnt get the idle down.
The 2 times I lost throttle servos were at very low settings during 3D. I was once left with a plane that barely had enough to fly yet was still too fast to land.
The first time I didnt have a kill so I had to fly it out.. at a low setting that takes a long time considering I like to have a big enough tank so I can fly 20 mins any style I like. I prefer to be able to fly 20-25 mins at any giving time. At 10 or 12 mins I am just starting to have fun!
I prefer an optical kill over a choke servo.. I replace the switch with it and save the weight of the servo setup.