Sikorsky R-4

Sikorsky R-4
Paese	Usa
Ruolo	Elicottero
Prima mosca	14 gennaio 1942
Costruito	131

Le Sikorsky R-4 è un elicottero biposto progettato da Igor Sikorsky con un singolo rotore principale a tre pale e alimentato da un motore radiale. L'R-4 è stato il primo elicottero prodotto in serie su larga scala al mondo e il primo elicottero utilizzato dalle forze aeree dell'esercito degli Stati Uniti, dalla Marina degli Stati Uniti, dalla Guardia costiera degli Stati Uniti e dalla Royal Air Force e Royal Navy del Regno Unito. Nel servizio della Marina degli Stati Uniti e della Guardia Costiera degli Stati Uniti, l'elicottero era noto come Sikorsky HNS-1. In servizio in Gran Bretagna era conosciuto come Hoverfly.

fonte: Sikorsky R-4 su Wikipedia

Sikorsky XR-4C Walk Around
Fotografi	Vladimir Jakubov
Localizzazione	Museo Nazionale dell'Aria e dello Spazio – Udvar-Hazy Center, Chantilly, VA
Foto	33

Sikorsky XR-4C 01

Sikorsky XR-4C 02

Sikorsky XR-4C 03

Sikorsky XR-4C 04

Sikorsky XR-4C 05

Sikorsky XR-4C 06

Sikorsky XR-4C 07

Sikorsky XR-4C 08

Sikorsky XR-4C 09

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General Characteristics

The Sikorsky R-4 (known as the Hoverfly in British service) was the world’s first mass-produced helicopter and the first to be successfully put into service by the United States Army Air Forces (USAAF) and Allied military forces during World War II. Designed by Igor Sikorsky, it pioneered the single-main-rotor, single-tail-rotor configuration common today. It was primarily used for training, liaison, and air-sea rescue.

Property	Typical Value (R-4B Production Variant)
Ruolo	Liaison, Training, Search and Rescue (SAR)
Designer/Manufacturer	Igor Sikorsky / Sikorsky Aircraft
First Flight (Prototype XR-4)	14 gennaio 1942
Equipaggio	2 (Pilot and Passenger/Co-pilot)
Rotor Diameter	11.58 m (38 ft)
Length (Fuselage)	10.2 m (33 ft 8 in)
Max Takeoff Weight	1,170 kg (2,581 lb)
Units Built	131 (All variants)

Design and Powerplant

Engine: One Warner R-550-3 7-cylinder air-cooled radial piston engine.
Power Output: 149 kW (200 hp). (Earlier variants used 165 hp or 180 hp engines.)
Rotor System: Single main rotor with three wooden blades, and a two-bladed anti-torque tail rotor.
Construction: Fuselage constructed from steel tubing truss, covered with doped fabric to reduce drag.
Pilot Controls: Incorporated the cyclic stick, collective pitch lever, and rudder pedals for the tail rotor, establishing the standard helicopter control layout.
Historic Use: Achieved the first air-based combat rescue in Burma in April 1944.

Prestazione

Maximum Speed: 121 km/h (75 mph, 65 knots) at sea level.
Cruise Speed: 105 km/h (65 mph, 56 knots).
Range: Approximately 210 km (130 miles, 110 nautical miles).
Service Ceiling: 2,400 m (8,000 ft).
Climb Rate: 3.3 m/s (650 ft/min).
Piloting Difficulty: The R-4 was notoriously difficult to fly due to vibration and the lack of a governor to automatically coordinate throttle with collective pitch changes.