(moved my response here, too) Having experienced the loss of a BL on my flat 8 cinestar, I will assert that the flight control should do the hard work. Mine did. I could not tell that a motor had stopped. But there are many different scenarios to consider: 1. Loss or impairment of a ESC 2. Loss or damage to a prop 3. Wiring or communication error 4. Loss or impairment to a motor It's hard to simulate most of these because of the complex physics and the many variables. IMHO, somebody's going to have to step up and volunteer to do some real world testing and certification that this stuff works (or doesn't).