For PC, after entering hydra, press W to lift up like a heli. Make sure you fly high enough. The higher, the better. After that, to switch to flying mode, press numpad 8 about 2 sec. When the hydra has fully turn into flying mode, the hydra will loose altitute slightly. This shows that it is in flying mode. To accelarate, press W. To turn the rudder, press Q or E. To yaw, press A or D. To view the back of hydra to see if other hydra is chasing you or not, press Q and E at the same time. To gain altitute, press the down arrow key. Hope this helps.
This post has been edited by demolisher on Friday, Apr 20 2012, 16:58