Dangerous Pre-Arm state

[shanggl]

With the Pre-Arm switch and arm switch on but the throttle is high , the drone is armed but the the motor is not running , it's in a Dangerous State ! ,if the throttle gets down by mis-operation or accident , the motor starts to spin !

so , the pre-arm is not "pre-arm" , hope the drone get armed only with the right sequence : pre-arm on & throttle at low then arm aux channel no . it will prevent a lot of accident .

or arm with the same arm aux channle switch on "Twice " when the throttle is at low

[bkleiner]

the rational here is that if your drone becomes disarmed because of a failsafe, it gives you the chance to regain control if the radio link comes back. with your proposal you would have to disarm, cut throttle, apply pre-arm, arm and raise throttle while your quad is falling from the sky.

edit: really this doesn't have anything to do with pre-arm. as you state yourself, the behaviour you are taking issue with is exactly the same independently of using pre-arm or setting it to anything that will activate at the same time as the regular arm switch.

[bkleiner]

throttle low was added to the pre-arm conditions in e773600b4f09c1496bf0ee1aad8a317c78e9f2e1 additionally a "failsafe lockout" was implemented that allows one to re-arm within a certain time frame after a failsafe without needing to pass the throttle check.