Cash flow analysis indicated keeping the wife was the correct choice. It was a quad copter, 4 big chainsaws were enough to pull me up the hill. A $20 model heli gyro on each axis, and some rather elegant mechanical mixing of lift-kill and yaw control under each saw motor. The gyros would drift pretty bad, so it was a challenge to control, what with the rpms of the saws being independent. Next step was going to be a VW motor with belt drive to four props to cure the assymetric lift caused by rpm fluctuation. The saws were brand new! Getting all 4 to run was never the problem.