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Meeting	ACGS Committee Meeting 96 - Hilton Head - October 2005
Agenda Location	4 GENERAL COMMITTEE TECHNICAL SESSION 4.2 Research Institutions, Industry and University Reports 4.2.2 Research Institutes and Companies 4.2.2.8 Saab
Title	Saab
Presenter	Staffan Bogg
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	The presentation briefly describes the background to the wake vortex problem that has been encountered with the JAS 39 Gripen and that is currently being solved by control law changes. At initial wake vortex passages there is a risk that the AoA vanes sense a decreased AoA when the aircraft enters the vortex and therefore adds more elevon command to fulfill the pilot pitch command. When the vortex shortly after hits the fuselage and wings, the elevons may be in a less favorable position. The implemented filters and control law changes has recently entered the flight test phase and so far all (approximately 65) wake vortex passages has been detected. The topic will be further described at the SAE fall meeting 2006 when flight test results are available as well as the final design. The presentation also gives a snapshot of the development status for the Gripen FCS and new functionalities that are implemented such as improved maneuver load limiting functionality (required due to new external stores), coupled control functionality (with automatic navigation and climb) and a high authority altitude hold mode that handles engagement at all attitudes (and can be used as a Pilot Activated Recovery Fly-Up).