[lukevanoort]

^ Yeah, as I think sanddrag (I might have the wrong person) often says, even though that extra motor consumes more power, the load on each motor is also less than what it'd be without. So, the power consumption is not hugely better when only engaging two instead of three.

That said, I like this idea and have a similar design that invloves a torsion spring and a window (or globe) motor.