Quote:
Originally Posted by hamsterpower
Helicopters are inherently unstable, quads are stable and all forces are in balance. It makes a much better hover platform at the cost of efficiency.
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This isn't true. They are inherently unstable. There is no self correction without constant corrections from the electronic gyro. Try flying one for 10 seconds with the gyro disabled and you'll discover this quickly. There is zero return to self level and it will be like trying to stand on a beach ball.
Adding dihedral between the props helps some at the loss of efficiency.
Quads have become popular recently because of the advent of cheap sold state gyros.