voici ce qui est dit sur le wiki de DJI concernant le stop/start :
http://wiki.dji.com/en/index.php/Naza-M ... Stop_Motor" onclick="window.open(this.href);return false;, ça m'eclairci les idées ...
Start & Stop Motor Knowledge :
(1) Both Immediately Mode and Intelligent Mode are available in the Assistant Software: Advanced->Motor->Stop Type.
(2) Stop Motor method is defaulted to Immediately Mode.
Please get to know well about this section before flying.
1 Start Motor: Pushing throttle stick before takeoff will not start the motors. You have to execute any one of following four Combination Stick Commands (CSC) to start the motors:
Nzv2-start motor.png
2 Stop Motor: We provide two options to stop motors in the assistant software: Immediately and Intelligent.
(1) Immediately Mode: If you select this mode, in any control mode, once motors start and throttle stick is over 10%, motors will not stop immediately only when throttle stick is back under 10% the motors will stop. In this case, if you push the throttle stick over 10% within 5 seconds after motors stop, motors will re-start, CSC is not needed. If you don’t push throttle stick after motors start in three seconds, motors will stop automatically.
(2) Intelligent Mode: By using this mode, different control mode has different way of stopping motors. In Manual Mode, only executing CSC can stop motors. In ATTI. Mode or GPS ATTI. Mode, any one of following four cases will stop motors:
a) You don’t push throttle stick after motors start within three seconds;
b) Executing CSC;
c) Throttle stick under 40%, and after landing for more than 3 seconds.
d) If the angle of multi-rotor is over 70°, and throttle stick under 10%.
Notes of Intelligent Mode
(1) In ATTI. / GPS ATTI. Mode, it has landing judgment, which will stop motors.
(2) Start motors in ATTI. / GPS ATTI. Mode, you have to execute CSC and then push throttle stick over 10% in 3 seconds, otherwise motors will stop after 3 seconds.
(3) During normal flight, only pull throttle stick under 10% will not stop motors in any control mode.
(4) For safety reason, when the slope angle of multi-rotor is over 70° during the flight in ATTI. / GPS ATTI. Mode (may be caused by collision, motor and ESC error or propeller broken down), and throttle stick is under 10%, motors will stop automatically.
Notes of Intelligent Mode & Immediately Mode
(1) If you choose the Immediately, you should not pull throttle stick under 10% during flight, because it will stop motors. If you do it accidentally, you should push the throttle stick over 10% in 5s to re-start motors.
(2) DO NOT execute the CSC during normal flight without any reason, or it will stop motors at once.
(3) If you choose the Intelligent mode, and the throttle stick is under 10%, this will trigger the landing Procedure, in any control mode. In this judgment, pitch, roll and yaw controls are denied except the throttle, but multi-rotor will still auto level.
(4) In any control mode, DO NOT pull throttle stick under 10% during normal flight without any reason.
(5) Any of these two cut off types will only work properly if TX calibration is correct done.
(6) In failed-safe, CSC is denied by the main controller, motors will hold their state.
Phantom 1 et 2 / XC600 quad / Tarot 680PRO hexa / HobbyKing Super-H 600 / Porket Racer / Jpay Mini Hexa
Skywalker X8 / Z II / Sky Surfer 2400 et 2000 / Penguin Fingwing / Godiscover / Bixler 2 et 3 / Skyhunter 1900
4WD Mini Rally / Turnigy Trooper 4x4
On scomprend ! 
