Sikorsky R-4 | |
|---|---|
| Land | Usa |
| Rolle | Helikopter |
| Første flyve | 14. januar 1942 |
| Bygget | 131 |
Den Sikorsky R-4 er en to-sæders helikopter, der blev designet af Igor Sikorsky med en enkelt, trebladet hovedrotor og drevet af en radial motor. R-4 var verdens første store masseproducerede helikopter og den første helikopter, der blev brugt af United States Army Air Forces, United States Navy, United States Coast Guard og Storbritanniens Royal Air Force og Royal Navy. I US Navy og US Coast Guard tjeneste blev helikopteren kendt som Sikorsky HNS-1. I britisk tjeneste var det kendt som Hoverfly.
Kilde: Sikorsky R-4 på Wikipedia
| Sikorsky XR-4C Walk Around | |
|---|---|
| Fotografer | Vladimir Yakubov |
| Lokalisering | National Air & Space Museum - Udvar-Hazy Center, Chantilly, VA |
| Billeder | 33 |
Se også:
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) |
|---|---|
| Rolle | Liaison, Training, Search and Rescue (SAR) |
| Designer/Manufacturer | Igor Sikorsky / Sikorsky Aircraft |
| First Flight (Prototype XR-4) | 14. januar 1942 |
| Besætning | 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.
Præstation
- 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.
Set antal gange : 963
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