[QUOTE]However, the Harrier's weathervane probe is fixed inplace even when the Harrier is in normal wing borne flight. This increasesthe drag of the Harrier at higher speeds.[QUOTE]Is the "weathervane probe" literally a small weathervane? Presumably with a repeater in the cockpit? And why don't they use an ultrasonic probe which would have no drag at higher speeds? For the uninitiated, ultrasonic weather vanes are more accurate and reliable than electromechanical vanes, and no more expensive - I have one on my boat after the old mechanical one blew off in a gale!