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Pixhawk Ch3_in vs Ch3_out in not linear

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@Aero wrote:

Hi,
I am new to pixhawk and arducopter 3.4. I am testing the copter on ground. what i learnt after arming the copter that the throttle response was not very linear or responsive to transmitter stick movement/inputs. Motor starts with jerk and slow down very late as compared to stick input.
Below is the graph plotted between channel-3 In Vs Ch3-Out

However, when i connect ESC directly to Rx, the motor response to stick movement is very linear.
Motors: SunnySKy 980kv
ESC; Little bee 30A with blheli firmware

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