R-4 vs TH-55 Osage
| American helicopter from the 1940s, first to be produced in quantity, used primarily in World War II for rescue operations. | |
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| Origin country | 🇺🇸 United States |
| Category | Military Helicopter |
| Manufacturer | Sikorsky |
| First flight | 13 January 1942 |
| Year of introduction | 1944 |
| Number produced | 131 units |
| Average unit price | $0.0 million |
| American training helicopter, prominent during the Vietnam War, extensively utilized for instructional duties by the US Army. | |
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| Origin country | 🇺🇸 United States |
| Category | Military Helicopter |
| Manufacturer | Hughes |
| First flight | 2 October 1956 |
| Year of introduction | 1961 |
| Number produced | 2800 units |
| Average unit price | $-- million |
| Wingspan | 11.6 m ◉ |
| Height | 3.8 m ◉ |
| Length | 10.8 m ◉ |
| Maximum speed | 121 km/h ◉ |
| Operational range | 370 km |
| Service ceiling | 2,400 m ◉ |
| Max. takeoff weight | 1,150 kg ◉ |
| Empty weight | 950 kg ◉ |
| Total thrust | None x None None ◉ |
| Wingspan | 7.7 m ◉ |
| Height | 2.5 m ◉ |
| Length | 8.8 m ◉ |
| Maximum speed | 140 km/h ◉ |
| Operational range | None km |
| Service ceiling | 4,000 m ◉ |
| Max. takeoff weight | 703 kg ◉ |
| Empty weight | 435 kg ◉ |
| Total thrust | 1 x 130 kW ◉ |
Performance Radar Chart
Photo of TH-55 Osage by Alf van Beem.