R-4 vs SA315 Alouette II
| 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 Helicopters |
| Manufacturer | Sikorsky |
| First flight | 13 January 1942 |
| Year introduced | 1944 |
| Number produced | 131 units |
| Average unit price | $0.0 million |
| French light helicopter, renowned for its high-altitude service in the Himalayas during the 1960s and subsequent global deployments. | |
| Origin country | 🇫🇷 France |
| Category | Military Helicopters |
| Manufacturer | Aérospatiale |
| First flight | 12 March 1955 |
| Year introduced | 1957 |
| Number produced | 1300 units |
| Average unit price | $-- million |
| Wingspan | 11.6 m |
| Height | 3.8 m â—‰ |
| Length | 10.8 m â—‰ |
| Maximum speed | 121 km/h |
| Operational range | 370 km |
| Service ceiling | 2,400 m â—‰ |
| Max. takeoff weight | 1,150 kg â—‰ |
| Empty weight | 950 kg â—‰ |
| Total thrust | 0 â—‰ |
| Wingspan | -- m |
| Height | 2.8 m â—‰ |
| Length | 9.7 m â—‰ |
| Maximum speed | -- km/h |
| Operational range | -- km |
| Service ceiling | 2,300 m â—‰ |
| Max. takeoff weight | 1,600 kg â—‰ |
| Empty weight | 895 kg â—‰ |
| Total thrust | 1 x 343 kW â—‰ |
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