Sikorsky R-4

Sikorsky R-4
Zemlja	Sad
Ulogu	Helikopter
Prva muva	14 januar 1942
Izgradio	131

Čaj Sikorsky R-4 je helikopter sa dva sedišta koji je dizajnirao Igor Sikorski sa jednim glavnim rotorom sa tri oštrice i koji se napaja radijalnim motorom. R-4 je bio prvi helikopter masovne proizvodnje na svetu i prvi helikopter koji su koristile vazduhoplovne snage Vojske Sjedinjenih Američkih Država, mornarica Sjedinjenih Američkih Država, Obalska straža Sjedinjenih Američkih Država i Kraljevsko vazduhoplovstvo Velike Britanije i Kraljevska mornarica. U američkoj mornarici i službi Američke obalske straže, helikopter je bio poznat kao Sikorski HNS-1. U britanskoj sluћbi bio je poznat kao Hoverfly.

Izvor: Sikorsky R-4 na Wikipediji

Sikorsky XR-4C Walk Around
Fotografi	Vladimir Jakubov
Lokalizacija	National Air & Space Museum – Udvar-Hazy Center, Chantilly, VA
Fotografije	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)
Ulogu	Liaison, Training, Search and Rescue (SAR)
Designer/Manufacturer	Igor Sikorsky / Sikorsky Aircraft
First Flight (Prototype XR-4)	14 januar 1942
Posada	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.

Performanse

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.