Lost control of model, 2nd flight on new EVO transmitter and EVO flybarless

Brand new EVO touch and brand new EVO fbl. Second flight after 1 tuning flight for switch to 760/250hz and setting up transmitter. Shortly into the flight I lost control of the model, I was about 30-40m from model in a slow inverted circuit. I instinctually hit the motorl idle to try to autorotate down. I was able to level the model and came down in a hard landing on its skids, no damage other than a dented boom from boom strike. Event log shows packet losses followed by RC failsafe activated.

Here is the logfile:

13.05.2023 13:36:42;VStabi Start -- Neu 700
13.05.2023 13:36:42 Info;Bank 1 Loaded
13.05.2023 13:36:44 Good;Scorpion ESc Detected!
13.05.2023 13:36:46 Info;Calibration Finished
13.05.2023 13:37:13 Good;/battery/bt_3
13.05.2023 13:37:13 Good;Battery selected manually: New Batt 3
13.05.2023 13:37:49 Info;Governor Active
13.05.2023 13:37:49 Good;Motorswitch Motor On
13.05.2023 13:38:16 Info;Raised Vibration Level
13.05.2023 13:38:25 Info;Bank 2 Loaded
13.05.2023 13:38:26 Info;Raised Vibration Level
13.05.2023 13:38:37 Warn;High Vibration Level
13.05.2023 13:38:47 Warn;High Vibration Level
13.05.2023 13:38:57 Info;Raised Vibration Level
13.05.2023 13:39:07 Info;Raised Vibration Level
13.05.2023 13:39:17 Info;Raised Vibration Level
13.05.2023 13:39:21 Warn;RC Input Packets lost
13.05.2023 13:39:27 Info;Raised Vibration Level
13.05.2023 13:39:38 Info;Raised Vibration Level
13.05.2023 13:39:44 Warn;RC Input Packets lost
13.05.2023 13:39:44 Error;RC Failsafe activated
13.05.2023 13:39:44 Info;Governor Idle
13.05.2023 13:39:44 Good;Motorswitch Idle Bailout
13.05.2023 13:39:47 Info;Raised Vibration Level
13.05.2023 13:39:48 Error;Aileron Sensor Value out of Range
13.05.2023 13:39:48 Error;Elevator Sensor Value out of Range
13.05.2023 13:39:58 Error;Extreme Vibration Level
13.05.2023 13:39:59 Info;Off - ESC - Umin:46.8V Imax:86.9A Temp:38?
13.05.2023 13:39:59 Info;Governor Stop
13.05.2023 13:39:59 Good;Motorswitch Motor Off
13.05.2023 13:48:34 Warn;SCO BEC Voltage
13.05.2023 13:48:39 Good;Scorpion ESC Disconnected
13.05.2023 13:48:42;VBar Logfile End -- 13.05.2023 -- 13:48:42



SAB Raw 700
Egodrift 4525/550HT
Scorpion Tribunus II 14-200 SBEC
Theta Razor servos
Maniax 12s

New EVO Touch and new EVO FBL

Is there a belt drive below the Vbar?

if yes - which things have been done to avoid statics?

regards (EN) / Gruss (DE)

Rainer Vetter

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Yes there is a belt drive. The boom is metal and grounds to the frame on SAB helis as far as I know. Is there something else I can do to avoid static?

I have had 49 flights on this model on original touch and NEO with no issues.



Edited 1 time(s). Last edit at 05/14/2023 02:10PM by av8roc.

Could you provie a few more infos, is there a electric connection between the boom, the main gear plate and motor plate?

regards (EN) / Gruss (DE)

Rainer Vetter

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Posting and answering - please use a PC and a standard keyboard. Answer all questions fully, take the needed time, don't forget probably requested attachments.

Für Posts und Antworten bitte einen PC und eine richtige Taststaur benutzen sowie alle Fragen vollständig abarbeiten. Nehmt Euch Zeit, beantwortet Rückfragen in Ruhe und vollständig.
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Für Einzelkommunikation bitte ausschließlich Email verwenden! - PN, Messenger, Chat usw. werden nicht bearbeitet.
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Yes. On a SAB Raw 700 the metal boom
Is grounded to the frame of the heli and metal tail. There is no need to run ground straps to any part of the heli.
This is not a new heli, this is a new transmitter and FBL

Any update on this? Seeing similar reports on Facebook.

Hi,

I would dare repeating the question, about grounding, but differently:

If you measure continuity between the tail rotor housing (metal part there, bearing, shaft), and the tail boom, the chassis, rotor shaft, motor plate, what do you get?

Quote:

There is no need to run ground straps to any part of the heli.

This is imo not enough, you have to be/to make sure.

Otherwise, in the screenshots, the antenna status looks OK, so it doesn't seem to be weak or damaged.

I would probably mount the EVO with the antenna wires pointing back, and route the wires out aft, left and right of the tail boom.
A servo is also an emitter of EM fields, could cause EM troubles.

The change between NEO and EVO could be the narrower pulse and higher frequency, causing the servo to work harder, and emit more.
We're exploring new territory again, I guess.

Kind regards

Eddi

Born to fly ...
forced to work.

I checked and there is continuity across the tail case/boom/head and motor block. Almost every SAB Model I know mounts the antenna this way due to the canopy design. I can’t route antenna wires back, I could probably go down and around the boom but what about my helis that have a carbon boom?

I don’t understand why the EVO is more sensitive to interference and more prone to packet loss/failsafe over the NEO. If that is the true then the risk is not worth the performance improvements in my opinion. It sounds like I will have to go back to using the NEO in my models.



Edited 3 time(s). Last edit at 05/15/2023 04:16PM by av8roc.

Hi,

Uli wrote on a different thread here that he made comparative tests between NEO and EVO, in the real world, and that there is not much of a difference.

We are still exploring, because such things didn't come up yet.

What I'd be curious about, in this setup, is, if you go to default 1,500 µs/144 Hz, on the swash plate, instead of 760 µs/250 Hz, is there a difference?
It's always easy to say, this one is more sensitive than that, when, on the other hand, you make a significant change to other components at the same time (here: more power because quicker/faster action and reaction) on the model, with a metal housing, and with a wire sticking out, and close to the antenna wires.

Both can be true, but unless proven otherwise ...

I know there's a risk in testing, but as you learned, once the motor stopped (which can also be evidence for another electric thing happening on the model, besides). Maybe this can even be replicated on the ground, with the model running, no blades, and with working the servos quickly, maybe even amplified with Pitch Pump.

Then, the next step could be, move the antenna wires and/or VBar away from the suspected source of the troubles, and try again.
Or try upping the refresh rate but not the frequency, and vice versa.

I guess you don't have equipment for EMC testing around
Nor do I :-/

Kind regards

Eddi

Born to fly ...
forced to work.

Thanks Eddi for your input. To be honest I don’t think the testing is worth the trouble. I know the NEO is reliable, I’ll
just go back to it. Im just disappointed I purchased 2 EVO’s and a an EVO touch when I could have stayed with my VCtrlT and NEO’s.