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Lost throttle control in manual mode - full throttle!

@RRacer wrote:

Hello all,
I've returned to RC from a 25 year break, and have been doing LOS flying with helis, planes and small quads.
This winter I got a Pixhawk that went into a Bixler 3. The Bix3 isn't as spacious as you'd expect...
So today my plan was to maiden her, just manual flying to see that the airframe was ok. Otherwise fully loaded.
I had the wheels on it so the start was ROG.
The start went as expected, but it felt a bit heavy due to all the things crammed into it and antennaes sticking out everywhere.
When in the air I tried to throttle back but it kept on going at full tilt, I thought I'd have to wait for the ESC to cut power and hoped there would be enough power for the servos and controller to glide it down.
All other controls worked but felt limited.
Did like 15 or so "circles" around the field before trying to change flight mode.
I did a quick change from manual to RTL and back to manual, and then gained control of the throttle again.
Landing went well but wasn't pretty.

Could you help me figure out what caused this?

I had to remove compass from pre arm checks for it to arm. Probably bad config of orientation of internal compass.
OrangeRx sbus receiver with sat.
M8N GPS
Telemetry to MissionPlanner GCS.

Zipped tlog-file appended.

2016-06-11 16-43-08.tlog.zip (595.3 KB)

Any help appreciated!

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