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Not sure what flight controller was on your Hex at the time but you are right, redundancy is not everything.agreed, but my hex was unconcontrolable while going down on me and going from a filed side to a side with houses and watching it just fall from the sky eventhough it is a hex was terrible... i have never had so much adrenalin rush through my body and praying that no one was injured (i don't mind things as they can be replaced) but still is also bad. fortunately nothing happened because it fell in the front lawn of a house outside of the fence only being broken...
so redundancy has been no good friend of mine...
note: it turned out that a solder point got loose and probably a second which caused the crash eventually...
keeping in mind that the hex is heavier and failing over anything ultimaty causes more damage and if it is spinning around due to a prop failure it's even more dangerous than an I1 just droping like a rock...
please correct me or teach me if i am wrong about something here. that was my experience.
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Although most FC's have algorithms to cope with a single prop/motor/esc failure on a six or more propped machine they can still be difficult to control.
An X8 or X12 is better since thrust is still maintained on the axis of failure if a single engine goes out.
For any flights around people/crowds the CAA need an Operating Safety Case (OSC) which must be submitted and approved before the flight can take place.
There are many hoops to jump through regarding emergency procedures, alternative landing areas, cordons and in cases like this the CAA would probably only allow it if the aircraft was fitted with a parachute to reduce the kinetic energy of the falling aircraft in the event of a catastrophic failure.