Hydra 70
Mk 66 rocket motor variants

Hydra 70

Section Title: Mk 66 rocket motor variants
Table Section Text: None

Designation	Description

Mk 66 Mod 0	70 mm (2.75 in) WAFAR universal motor; common motor for the GD Hydra 70 series of rockets; original prototype; for US Army

Mk 66 Mod 1	Mk 66 variant; production variant; for US Army

Mk 66 Mod 2	Mk 66 Mod 1 variant; HERO (Hazards of Electromagnetic Radiation to Ordnance) safe; for US Navy and US Air Force

Mk 66 Mod 3	Mk 66 Mod 1 variant; HERO safe; Mk 66 Mod 2 for US Army

Mk 66 Mod 4	Mk 66 Mod 2/3 variant; incorporates a Salt rod to reduce exhaust gases; for all services

Mk 66 Mod 5	Mk 66 Mod 4 variant; Incorporates propellant venting during fast cook off

Mk 66 Mod 6	Mk 66 Mod 4/5 variant; designed to reduce the tendency of secondary launch gasses to combust in the parent aircraft’s engine, primarily with the AH-64 helicopter

Sentence(s)

The Hydra 70 has 2.75-inch of Rocket, United States.

final_sentence: The Hydra 70 has 2.75-inch of Rocket, United States.