Grob Aircraft, formerly
Grob Aerospace
Grob G 520 Egrett turboprop
Introduction 1991
Grob G 520 EGRETT
is a turboprop
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| Grob G 520T | |
| Role | High-altitude and reconnaissance aircraft |
|---|---|
| Manufacturer | Grob Aircraft |
| First flight | 24 June 1987 |
| Introduction | 1991 |
| Number built | 6 |
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History Grob Aircraft, formerly
Grob Aerospace
Grob G 520 EGRETT is a turboprop Introduction 1991
The Grob G 520 is a turboprop long-endurance, high-altitude reconnaissance and surveillance aircraft built by Grob Aircraft with short runway capabilities and full approval for all-weather IFR/icing operations according to LBA/FAA Part 23 regulations. Developed and certified in 1991, the Grob G 520 is one of the world's largest fully composite manned aircraft and holder of several world records. Production was resumed in 2014.
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.
Development
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, 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.
The initial D-450 EGRETT I development aircraft flew in 1987 and established three world records for altitude and time to climb in September 1988:
- Time to climb to 15,000 metres (49,213 ft): 40 minutes 47 seconds
- Altitude in horizontal flight: 16,239 metres (53,278 ft)
- Altitude without payload: 16,329 metres (53,573 ft)
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Grob Aircraft, formerly Grob Aerospace
Grob G 520 Egrett is a turboprop
Grob Aircraft, formerly Grob Aerospace
Grob G 520 is a turboprop
General Info
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- 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)
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Powerplant
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- Empty weight: 3,300 kg
- Max takeoff weight: 4,700 kg
- Fuel capacity: 1,070 kg
- 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
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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)
- 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 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)
Related development
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- 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)
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Links to Youtube & Others
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. However, in February 1993, before much production had taken place, the process of procurement came under scrutiny when accusations of corruption (Amigo Affair) surrounding the former Bavarian Minister President Max Streibl became public.
Grob G 520 Egrett
is a turboprop
The G 520T is a two-seater version of the G 520. Initially planned for training and demonstration purposes, the single G 520T built was repurchased by Grob Aircraft in 2014.
Youtube Link
The G 520NG will be the revised production version of the initial G 520T. According to company statements during Farnborough Airshow 2014 deliveries can start in 2016.
Read more in Grob Aircraft, formerly
Grob Aerospace
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