Model Variants (Including Prototypes)
H-2 - Initial Prototype Seaplane Models; 2 examples produced.
H-4 - Royal Navy production forms of the H-2; 62 examples produced.
H-8 - Based on H-4; dimensionally larger.
H-12 - Production version of the H-8 for Royal Navy and US Navy use; 2 x Curtiss or Rolls-Royce engines; 104 examples completed.
H-16 - Base Series Designation; based on the H-8; longer wings; dimensionally larger; reinforced hull; Liberty or Rolls-Royce engines; 334 examples completed.
Model 6C - Alternative Designation
Model H-16-1 - One-off prototype; fitted with engines in "pusher" configuration.
Model H-16-2 - One-off prototype; fitted with engines in "pusher" configuration; revised wings.