Sikorsky R-4
The Sikorsky R-4 is the first military helicopter built in USA. It flown during World War II and beginning of Korea War. Some were used by US Navy, US Coast Guard and Fleet Air Arm.
| Sikorsky R-4 | |
|---|---|
 | |
| Sikorsky R-4 of the Fleet Air Arm. | |
| Role | Helicopter |
| National origin | USA |
| Manufacturer | Sikorsky. |
| First flight | 1942 |
| Introduction | 1943 |
| Status | Out of order |
| Primary user | United States Army Air Force |
| Number built | 131 examples. |
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