I've got a strange issue with ardupirates NG,
when i first connect the battery today to the arducopter,
then trying to takeoff it pulls to a direction very strong, like if the front and left motors are running stronger without touching the stick !
i didn't takeoff with that situation,
i disconnected the battery, and reconnected after 3 seconds, then everything worked OK and the motors all took off vertically.
any possible explanation and way to solve this?