Testing out how the new Y6 responds to an in-flight motor failure. Not bad!
hmm would be nice if you made a more clear video, perhapse record at a higher angle or closer/zoom
We'll get another one up soon. The flight ops guys down in San Diego are up here in the Bay area to attend Maker Faire this weekend. When they get back home, there will be more tests and video.
Here is an onboard view:
Very neat video!
On a Y6 configuration is there any adverse aerodynamic effect to having the lower propeller working in the airstream of the upper propeller? Seems like the thrust of the upper propeller will constantly be slamming against the lower propeller disk.
John, you are definitely correct, there is an efficiency loss, but the gains found in overall function and performance are worth consideration.
Joe did a bunch of testing and found that a 11x4.7 prop on the bottom and a 10x4.7 on the top are the best setup for the Y6.
@Ian: Yes, it's a bit more abrupt initially as a motor power failure allows the prop to autorotate a bit to give the controllers time to adjust. With a prop snap, you lose power immediately and it will lean immediately to an uncontrollable attitude if you don't react quickly.
I found a Y6 motor failure barely controllable with AC2.7 & earlier versions, but with AC2.9+, you're seeing the improved throttle control algos really shine in the above video. Good job guys.
As for coaxial configurations: http://diydrones.com/forum/topics/y6-and-hexa-equal-lift
I find that "it all depends", the NASA paper shows about a 18% efficiency loss... I do find my Y6 flght times are 3-4min less than my hexas flight times. As for power, on pure vertical climb I see periodic effects with climb rate on the Y6 sometimes, where as the hexas are always "linear". In horizontal flight, the Y6 has more pitch/bowl effect and needs more angle boost compensation to stay level. But the Y6 hovers better in wind and moves more acrobatically like a quad when in motion comared to the hexas.
That's very good Josh. Especially like the motor failure setup. Question, is there a new Hex coming out that will be able to continue to fly with only 5 motors?
After testing Y6 setups for long time, I can tell there is no need for different speeds or prop sizes with prop size up to 12", also it much better to use E-props and not SlowFlyers, on 800-900KV motors with 4S lipos.If you want to fly in strong wind Y6 or X8 with e-props is the best setup.
Hi Max, when you say e-prop, are you referring to APC E props or the graupners?
I did a bot of research and found you loose 25% of your power and efficiency through this setup, so what you gain through redundancy you loose in flight time and power to weight, however i would rather have a copter that ;ands more often than a copter than "lands" once.
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