First Flight Test Results (initial observations only):
-Sound: a little lower tone, but not noticeably louder or quieter
-Thrust: took longer to take off and seemed to have less of a climb rate than with the wood
-Performance: they seemed to spin up faster than wood, which as we know is already a bit too fast
So I had my first emergency landing (after 5 minutes in the air)… I think the rubber washers got hot and started to tear apart allowing two props to come loose (both on the right side). I was at max power, and as soon as they got loose I felt a strong clockwise rotation that easily corrected when I let off the power.
Staying at 50% - 75% power I was able to get back to the LZ without any twisting. I guess that answers the question of what will happen if 2 motors fail on the same side.