Cheshirecat
Member
I had my first motor out event on Sunday whilst in a stable hover at 280 Feet.
A big change in audible motor pitch was the first indicator, like it was fighting a big wind gust (except there was not very much) followed by some very twitchy pitching.
I chose to bring the aircraft down and during the descent it went into an uncontrolled clockwise Yaw which stayed that way until touch down.
Got it down without any danger to persons or property and intact but found the workload high so never actually noticed that a prop was not turning but also did not expect an X4 to spin with 1 motor out.
I suspected it was due to a motor failure and looking at the data logger for the Herkules quickly confirmed that motor 7 dropped out during the hover and never came back. In fact the datalogger on the Herkules is so good it didn't take long to confirm that the fault was due to a signal loss for motor 7 between the WKM and the Herkules (probable bad connection) but i shall swap the motor out just in case.
I could have made life a little easier for myself if i had put the WKM into Home Lock so a lesson learned on that one, but any ideas why an X4 would spin with 1 motor out?
my AUW is 9.2Kg on Tiger 4014 400KV and 15X5 props, hover is 55% at AUW so i expected enough reserve power to correct a yaw. The WKM didn't seem to be able to correct it in GPS mode but i could hold the Yaw manually in Atti by applying opposite stick. (seven sats locked at the time) either my expectations are off or i need to hunt down an imbalance in the setup.
Ideas welcome... Thanks
A big change in audible motor pitch was the first indicator, like it was fighting a big wind gust (except there was not very much) followed by some very twitchy pitching.
I chose to bring the aircraft down and during the descent it went into an uncontrolled clockwise Yaw which stayed that way until touch down.
Got it down without any danger to persons or property and intact but found the workload high so never actually noticed that a prop was not turning but also did not expect an X4 to spin with 1 motor out.
I suspected it was due to a motor failure and looking at the data logger for the Herkules quickly confirmed that motor 7 dropped out during the hover and never came back. In fact the datalogger on the Herkules is so good it didn't take long to confirm that the fault was due to a signal loss for motor 7 between the WKM and the Herkules (probable bad connection) but i shall swap the motor out just in case.
I could have made life a little easier for myself if i had put the WKM into Home Lock so a lesson learned on that one, but any ideas why an X4 would spin with 1 motor out?
my AUW is 9.2Kg on Tiger 4014 400KV and 15X5 props, hover is 55% at AUW so i expected enough reserve power to correct a yaw. The WKM didn't seem to be able to correct it in GPS mode but i could hold the Yaw manually in Atti by applying opposite stick. (seven sats locked at the time) either my expectations are off or i need to hunt down an imbalance in the setup.
Ideas welcome... Thanks
the last time i tried the mixer config by Andrea's i could not get 2 of the motors to fire up in test mode but putting it back to WKM defaults cleared the issues so there it stayed.
