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SAAB AEROSYSTEMS1

Gripen developmentGripen development

staffan.bogg@saab.se

presented at Meeting No. 96SAE Aerospace Control and Guidance System Committee

Hilton Head, SCOctober 19-21 2005

2003-11-13

2 SAAB AEROSYSTEMS

Wake vortex

• Problem- AoA vanes might sense reduction in AoA/Nz initially at vortex passage- Elevons put in worse positions (compared to a/c without active FCS)

• Wake vortex transient reduction functionality- Implemented in OFP R14:6- Detection filter based on current AoA-information- Instant switching to complementary filtered AoA (instead of AoA based primarily on vanes position) at wake vortex detection- Ordinary AoA monitoring (CBIT) bypassed

• Flight Test- FQ Level 1 previously proved with filtered AoA- All vortex passages detected and FCS reconfigured to filtered AoA as designed- Flight tests to verify models rather than characteristics- Detection filter behaviour at low level flight (less than 150 ft) with turbulence to be explored

2003-11-13

3 SAAB AEROSYSTEMS

New functionality

• Improved Maneuver Load Limiting function- New export external stores- Heavier a/c and more aft c.g.- Basic design stores combinations, ”care free” characteristics for all derivatives (nominal weapon release)

• Coupled Control functionality- Automatic navigation- Automatic/optimized climb

• Enhanced ALT mode- All attitudes (previoulsy limited to pitch angles of +/- 60 deg)- Increased authority (roll rate/nz) at ”unnormal” attitudes- Pilot Activated Fly Up