HO - Helicopter, Observation

Model Designation Manufacturer Engine(s) Crew Other
YHO-1DJ
Sud-Ouest 1 Turboméca Palouste IV 2
YHO-2HU
Hughes 1 Lycoming HIO-360-B1A 2 XH-42
YHO-3BR
Brantly 1 Lycoming VO-360-A1A 2
YHO-4BF
Bell 1 Allison T63 2 YOH-4A
YHO-5UH
Hiller 1 Allison T63-A-5 1 YOH-5A
YHO-6HU Cayuse Hughes 1 Allison T63-A-5A 2 OH-6A