Model Variants (Including Prototypes)
Model 107 - Vertol Prototype Model; fitted with 2 x Lycoming T53 turboshaft engines.
YCH-1A - US Army Prototype Evaluation Model designation of which three were produced.
HRB-1 - Initial Production Designation for US Marine Corps, later redesignated to CH-46 after 1962.
CH-46A - Initial Production Designation from HRB-1 after 1962; 107 produced for US Marine Corps usage; fitted with General Electric T58-GE-8 turboshaft engines.
UH-46A - Similar to the CH-46A but for US Navy use; 14 such delivered.
CH-46D - USMC model fitted with T-58-GE-10 powerplants.
UH-46D - US Navy model similar to CH-46D USMC model.
CH-46E - Upgraded CH-46D and CH-46F models; fitted with T58-GE-16 powerplants; improved crew survivability features.
CH-46F - Improved avionics
CH-113 "Labrador" - Canadian CH-46A search and rescue models.
CH-113A "Voyageur" - Canadian CH-46A transport models.
HKP-4 - Swedish variant fitted with Rolls-Royce powerplants.
KV 107 - Japan license-produced Model 107 series of various role types.