Best configuration/frame and autopilot for redundancy?

[lostngone]

I am building a new multi-rotor, I do have a little experience with quads but it is way out of date so I classify myself as a beginner.

I am looking at the best frame, configuration and autopilot for surviving a motor failure. When I built my arducopter(a long time ago) the thinking was that only an Otco could survive a motor failure and keeping flying and that a Hexa at best could crash gracefully.
However now I am getting back into multi-rotors I am reading people are claiming that Y6s and Hexas can fly with a dead motor? I know there are a LOT of variables in this question like altitude, payload and environment. To make things simple lets say, drone only(no payload), plenty of altitude with no wind.

So back to the question, what is the best frame, configuration and autopilot for surviving a motor failure.

 

[lostngone]

Really, no one has an answer or at least an opinion?!?

Bump...

 

[DucktileMedia]

Probably because this has been brought up a ton of times in the last few years. It's more or less the same answer every time. Try doing a search for redundancy and all your answers will be there.

 

[lostngone]

Thank You for your reply. That is sad to hear that absolutely no improvements have occurred over the years.

 

[Pumpkinguy]

From my archive reading I formed my own opinion. A hex can sustain a single rotor failure just as a octo can. Only difference is you have less of a chance of one failing when you only have 6 motors and esc's compared to 8. So, for medium lift I will use a hex. I don't think frame selection has much to do with redundancy providing you pick a frame rated for the weight.
A2 claims to have a "single motor failure" feature but I'd like to test that before I am a believer.
The best redundancy is a preventative maintaince program imo. Make a schedual and stick to it. For example, replace bearings every 50 hours. Check all connections every 10 hours Etc.

 

[SleepyC]

The ZeroUAV Gemini Flight Control offers complete 2 of everything redundancy and is one of the best FC's out there. 2 GPS, 2 IMU's, 2 Power supplies and it auto senses which one is working better and uses that.

 

[Carapau]

DJI Wookong and A2 are well proven to operate well with a motor out both in hex and in octo form. A hex if slightly underpowered when loosing a motor will still fly but is likely to start spinning due to torque imbalance. To deal with this, flick into home lock mode and fly home. The problem is less with an octo as the torque imbalance is less. I have witnesses an A2 dealing with a motor out and we only noticed the motor was out as we bought the machine into land.