MD Helicopters MD-520N
- CountryUnited States of America
- TypeLight utility helicopter
- PowerplantsOne 280kW (375shp) Rolls-Royce 250-C20R turboshaft driving a five blade main rotor.
- PerformanceMax cruising speed at S/L 250km/h (135kt). Initial rate of climb 1850ft/min. Service ceiling 14,175ft. Hovering ceiling in ground effect 11,200ft, out of ground effect 6000ft. Range at S/L 424km (229nm). Endurance at S/L 2hr 24min.
- WeightsEmpty 742kg (1636lb), max takeoff 1520kg (3350lb), or 1745kg (3850lb) with an external sling load.
- DimentionsRotor diameter 8.33m (27ft 4in), length overall rotor turning 9.78m (33ft 2in), fuselage length 7.77m (25ft 6in), height with standard skids 2.74m (9ft 0in), height with extended skids 3.01m (9ft 11in). Rotor disc area 54.5m2 (586.8sq ft).
- CapacityStandard seating for pilot and four passengers, with pilot and passenger on front bucket seats, and three passengers on rear bench seat.
- ProductionTotal built 102 by mid 2006.
The MD Helicopters MD-520n presented a progressive development in helicopter plan as it shed an ordinary tail rotor for the Hughes/Mcdonnell Douglas' created NOTAR (NO Tail Rotor) framework.
Advancement of the progressive NOTAR framework goes again to late 1975 when Hughes engineers started introductory idea improvement work. In December 1981 Hughes flew an OH-6a fitted with NOTAR surprisingly. This model was altered a few times, prominently in 1985 when it was fitted with the more streamlined MD-500e forward fuselage, an Allison 250-C20b turboshaft, a second blowing opening and another fan. By then Hughes had ended up Mcdonnell Douglas.
Despite the fact that the idea, which utilizes the Coanda impact, took sooner or later to refine, the NOTAR framework is straightforward in principle and attempts to give directional control the same way a wing creates lift. Low weight air is constrained through two spaces on the right half of the tailboom, bringing about the downwash from the fundamental rotor to embrace the tailboom, delivering lift, and in this manner a measure of directional control. This is enlarged by an immediate plane thruster and vertical stabilizers.
NOTAR framework profits incorporate far lower outside commotion (the MD-520n is the quietest certificated helicopter on the planet), expanded security because of the absence of a tail rotor, enhanced taking care of and execution, diminished vibration and simpler viability.
Mcdonnell Douglas initially planned to create the standard MD-520n nearby the all the more influential hot and high advanced MD-530n (both were propelled in January 1989 and were focused around the ordinary MD-500e). The MD-530n was the first to fly, on December 29 1989, the MD-520n first flew on May 1 1990. Advancement of the MD-530n was suspended when Mcdonnell Douglas chose that the MD-520n met most client necessities for the 530n. Affirmation for the MD-520n was recompensed on September 13 1991, and the first was conveyed on December 31 that year.
Taking after the 1997 Boeing/Mcdonnell Douglas merger, Boeing sold the previous MD common helicopter lines to MD Helicopters in ahead of schedule 1999.
At the 2000 Farnborough Airshow MD Helicopters published upgrades to the MD-520n including an enhanced Rolls-Royce 250-C20r+ motor with 3-5% more power for better execution on warm days, and, with progressions to the diffuser and fan apparatus, expanded extent and payload ability.
Pictures of MD Helicopters MD-520N
