GRS 6 is a parachute recovery product that uses aerodynamic drag to slow a descending aircraft or payload. It forms part of a recovery installation, with the canopy, deployment mechanism and attachment system matched to the vehicle mass and operating envelope.
The GRS 6 is a ballistic parachute rescue system from Galaxy GRS for light aircraft, offered in 1640 and 1750 versions with a 320 square metre canopy. It is a rocket-deployed recovery parachute that slows the whole aircraft after a failure of the airframe, engine or control, and it is sold as a soft-pack installation with a ballistic device and sling.
The two versions differ by maximum operating mass. The 1640 version is rated for an MTOW of 1640 kg and the 1750 version for 1750 kg. Maximum permitted speed is 360 km/h for the 1640 and 335 km/h for the 1750. At those limits the dynamic opening shock is 83.3 kN or 5.1 G on the 1640 and 82.1 kN or 4.8 G on the 1750. At 250 km/h the opening shock is 66 kN and the canopy load is 2100 kg.
Descent and deployment figures tell the integrator how much height is needed. Descent rate at MTOW is 7.1 to 7.3 m/s at 1000 m AMSL and 7.3 to 7.5 m/s at 1500 m AMSL. Full canopy deployment is tested at 5.4 s and inflation at 95 km/h takes 6.0 s. The minimum projected rescue height at a horizontal speed of 95 km/h is 170 m. The canopy safety factor to ASTM F2316-12 is 1.5.
The canopy has 58 lines and panels, a nominal diameter of 18.1 m and 256 slider slots. A short-sleeve ejection method is used, driven by 322 rocket motors with a double striker and mechanical ignition. Static thrust is 1320 N (134 kg) and maximum thrust 1850 N (189 kg), with burn time of 0.95 s plus or minus 0.2 s over -40 to +60 degrees C.
For installation, the ballistic device and sling weigh 3.22 kg. The sling is 4 x 6 m with a 1.5 kg weight, and the complete GRS Soft B2 weighs 41.0 kg plus or minus 4 %. The soft pack measures 58 x 40 x 30 cm. The repacking and exchange cycle is 6 years, and the unit is installed in the airframe so the pack and sling attachment points must be sized to the opening loads above.
Typical applications are certified and light-sport aeroplanes, gyroplanes and ultralight aircraft that need whole-aircraft recovery, and the maker states the tests relate to UL and LSA category aircraft.
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