Guard en de Britse Royal Navy. In de Royal Air Force (RAF) dienst waren ze Hoverfly genoemd. De R-4 was de eerste militaire helikopter die de Britse marine
Reemer, Menno (2020). A third species of the rarely collected Oriental hoverfly genus Furcantenna Cheng, 2008 (Diptera, Syrphidae, Microdontinae). ZooKeys
Reemer, Menno (2020). A third species of the rarely collected Oriental hoverfly genus Furcantenna Cheng, 2008 (Diptera, Syrphidae, Microdontinae). ZooKeys
Bristol Beaufighter (geen vliegtuigen) Mitsubishi G4M Betty Sikorsky R-4 Hoverfly Douglas C-47 Skytrain North American P-51 Mustang Douglas C-54 Skymaster