Grob G 520

G 520 in 1991

The Grob G 520 ‘EGRETT’ (former Grob/E-Systems/AlliedSignal Egrett – its name is derived from the three companies involved in its design: E-Systems, Grob Aircraft, and Garrett,[1] the latter firm later changing its name to AlliedSignal) is a surveillance aircraft developed in Germany in the 1980s by an international partnership. It was intended to fill a joint German Air Force – US Air Force requirement for a high-altitude, long-duration surveillance platform for treaty verification and environmental monitoring. Known as "LAPAS" (Luftgestütztes, abstandsfähiges Primär-Aufklärungssystem, engl: airborne, long distance primary reconnaissance system) in Germany and "Senior Guardian" in the US, the program initially attempted to acquire the Lockheed TR-1 (U-2) for this role, but when this did not succeed, a new aircraft was sought.

inflight, showing the high wing aspect ratio

The initial D-450 EGRETT I development aircraft flew in 1987, and in September the following year set a class altitude record of 16,329.35 m (53,573.96 ft). Two pre-production machines followed in 1989 and 1990 as the D-500 EGRETT II and then fitted out to the finalized G 520 design in 1991. These latter two aircraft were owned by E-Systems and Grob respectively, and used for promotional purposes: E-Systems' for various sensor packages, and Grob's (renamed the Strato 1) to market the design to civil authorities as a resource management platform.

Grob G 520T VH-ARA after landing in Germany

In 1992, the German Air Force placed an order for production of nine EGRETT IIs, to be supplemented by G 520T two-seat trainer and one of the demonstrators.[2] However, in February 1993, before much production had taken place, the whole program was cancelled[2] when Eastern Europe ceased to be perceived as a threat. The two-seater-version G 520T was completed and sold to Airborne Research Australia in Adelaide. In 2014, Grob Aircraft repurchased the G 520T and flew it back to Germany.[3] The repainted aircraft will be presented to the public during the Farnborough Airshow 2014, simultaneously as kick-off for resuming the production of the G 520T.[4]

As of 2014 the G 520 held several world records. This aircraft established three world records for altitude, time to climb in 1988. In addition, it was the first composite aircraft specifically designed for stratospheric research and reached a record altitude of 53,573.96 feet (16.329,35 meters).[5]

• Time to climb to 15,000 meters: 40 minutes 47 seconds[6]
• Altitude in horizontal flight: 16,238.55 meters (53,276.09 feet)[7]
• Altitude without payload: 16,329.35 meters (53,573.96 feet)[8]

G 520T during ground testing

The G 520 is a fully composite conventional mid-wing monoplane with extremely high aspect ratio wings. Power is provided by a single turboprop Honeywell TPE 331-14F with a 4-blade Hartzell propeller, and it is equipped with a tricycle undercarriage, whose main units retract into fairings on the wings. The flexible payload-bay concept of the G 520 can accommodate multiple mission systems for both civilian and military applications and 12 payload compartments for up to 850 kg of mission equipment make the G 520 an ideal multi-role platform for a wide range of missions. The cockpit of the G 520T provides room for a pilot and a sensor operator as well as for equipment which has to be placed inside the pressurized cabin. The instrument panel can be optionally equipped with a digital glass cockpit IDU-680 EFIS by Genesys Aerosystems.

 Australia

Airborne Research Australia

 Germany

German Air Force

 United States Argentina

Perlan Project High altitude glider towing [9]

Data from Grob[10]

General characteristics

• Crew: one
• Capacity: one passenger / 850 kg (1,870 lb) payload
• Length: 13.82 m (45 ft 4 in)
• Wingspan: 33.0 m (108 ft 3 in)
• Height: 5.66 m (18 ft 7 in)
• Wing area: 39.67 m² (427.0 sq ft)
• Empty weight: 3,300 kg (7,275 lb)
• Max takeoff weight: 4,700 kg (10,362 lb)
• Fuel capacity: 1,070 kg (2,360 lb)
• Powerplant: 1 × Honeywell TPE331-14F Turboprop aircraft engine, 560 kW (750 hp)
• Propellers: 4-bladed Hartzell, 3.04 m (10 ft 0 in) diameter constant-speed propeller

Performance

• Maximum speed: 469 km/h (291 mph, 253 kn) max. operating weight, MSL
• Cruise speed: 283 km/h (176 mph, 153 kn) at 11,000 m (35,000 ft) ISA, MTOW
• Stall speed: 107 km/h (67 mph, 58 kn) (MLW, landing configuration)
• Range: 3,670 km (2,280 mi, 1,980 nmi) at 15,000 m (50,000 ft) ISA, MTOW, 45 min reserve fuel, 500 kg (1,100 lb) payload
• Endurance: 7.5 hours at 15,000 m (50,000 ft) ISA, MTOW, 45 min reserve fuel, 500 kg (1,100 lb) payload
• Service ceiling: 15,240 m (50,000 ft) (max. certified operating altitude)
• Rate of climb: 7.3 m/s (1,440 ft/min)
• Time to altitude: 50 min to 14,000 m (45,000 ft)
• Take off distance over 15 m (50 ft): 670 m (2,200 ft) (MSL, ISA, MTOW, no wind, no slope)
• Landing distance over 15 m (50 ft): 685 m (2,247 ft) (MSL, ISA, MTOW, no wind, no slope)

Wikimedia Commons has media related to Grob G 520.

• G 520 official website
• Grob Aircraft official website