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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar |
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09-10-2014, 02:46 PM | #1 (permalink) |
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Join Date: Dec 2012
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SK720BE Logic
A technical question for you Georgi, Art or Omer.
What is the SK720BE looking at to determine "servo failure or mechanical failure". Just a curiosity of mine. I still see the warning regular and am sure its a glitch, but it gets me to wonder how it determines such a thing. Thanks!
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09-10-2014, 03:12 PM | #2 (permalink) |
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Join Date: Feb 2012
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I am not Georgi, Art or Omer, but I can answer it:
The message is displayed when the heli responds differently than it is being commanded. It might be that the heli couldn't respond as commanded because a swash servo or linkage failed, or it could be something benign like your tail blowing out during a tail slide. It could also happen if you have your control rates set higher than the heli is physically capable of manoeuvering. The system has no way of knowing the cause, it just knows that the heli isn't doing what the gyro is telling it to do. Edit: Or as Georgi says below, if you're running v4.0 firmware, there's a logging bug that can trigger the warning even if there is no problem. |
09-10-2014, 03:12 PM | #3 (permalink) |
Join Date: Mar 2007
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=] Martin, the warnings you are seeing are caused by playback errors, watch the stick movements in relation to the heli's response = mechanical fail ie, full rudder and the heli isn't really moving in the yaw axis, SK are aware....
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09-10-2014, 05:45 PM | #4 (permalink) | |
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Quote:
Thanks Georgi, I knew they were just errors but when functioning properly I wondered what the logic was for an error to occur in playback. Just curious. Humming Bird, Thanks for the insight, that makes perfect sense!
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09-10-2014, 06:21 PM | #5 (permalink) |
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Join Date: Sep 2008
Location: Smyrna, GA
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This is exactly what my 500 did when I lost the elevator servo. My cyclic channel mapping in the data viewer was showing that I had a full back elevator stick input trying to get the nose up, yet the heli wasn't responding as such, so I had the servo failure error and resultant nose in crash. I wondered myself exactly what factors were being used to make these determinations, and that makes perfect sense.......Input is saying do one thing but output isn't making it happen for whatever reason.
Good info and cool to know why and how it works now
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
09-11-2014, 06:18 AM | #6 (permalink) |
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Art/Georgi/Omer...
So the SK720BE looks at control input vs. reaction of the ship or servo movement to check accuracy of the system. When that accuracy check sees a disparity a "servo failure / mechanical failure" warning is triggered in the system and is displayed in the play back mode to us on our computer screens. Does it look at both pilot input vs. attitude change and gyro correction vs. attitude change? Since the SK knows there is an error that has occurred in the control loop and can warn us of this event in playback, any chance this warning can be part of telemetry? I have a discussion going over on the Goblin site about the use of battery sensors with audio horn and the fact I use them as a cheap and simple method of "telemetry' for individual battery cell voltages and total pack battery voltage of both 12c brick and 2 cell RX pack when I fly. Apparently some telemetry systems have the capability of reporting individual cell performance back to the TX which is perfect. Reporting only total bus voltage in a failure scenario is to late, individual cell failures being reported would be much faster for realizing you are facing a possible crash. That got me to thinking of your "servo failure / mechanical failure" warning with the SK. That's a great safety feature of the system but only if the information gets to the pilot in a timely manner such as telemetry. Those would be the "Big Two" items on my telemetry list. I need to know if my batteries are failing and again from looking at individual cells. I need to know if my flight control system is failing. Vibration warning level can be thrown in as a good addition to the telemetry system but its not part of my must have list. Since I don't use telemetry some of these may be available now and I am just not aware but if the battery cell voltage and servo / mechanical failure warning were available as telemetry I couldn't get my wallet out fast enough. I know you guys at Skookum were looking for another project.
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