TH-55 Osage vs R-4

American training helicopter, prominent during the Vietnam War, extensively utilized for instructional duties by the US Army.
Picture of TH-55 Osage
Origin country πŸ‡ΊπŸ‡Έ United States
Category Military Helicopter
Manufacturer Hughes
First flight 2 October 1956
Year of introduction 1961
Number produced 2800 units
Average unit price $-- million

R-4

American helicopter from the 1940s, first to be produced in quantity, used primarily in World War II for rescue operations.
Picture of R-4
Origin country πŸ‡ΊπŸ‡Έ 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
Wingspan 7.7 m β—‰
Height 2.5 m β—‰
Length 8.8 m β—‰
Maximum speed 140 km/h β—‰
Operational range None km
Service ceiling 4,000 m β—‰
Max. takeoff weight 703 kg β—‰
Empty weight 435 kg β—‰
Total thrust 1 x 130 kW β—‰

R-4

Wingspan 11.6 m β—‰
Height 3.8 m β—‰
Length 10.8 m β—‰
Maximum speed 121 km/h β—‰
Operational range 370 km
Service ceiling 2,400 m β—‰
Max. takeoff weight 1,150 kg β—‰
Empty weight 950 kg β—‰
Total thrust None x None None β—‰

Performance Radar Chart

Photo of TH-55 Osage by Alf van Beem.