- PEO Missiles and Space
- Joint Attack Munition Systems
- 5250 Martin Road
- Redstone Arsenal, AL 35898
- (256) 876-1141
70mm - HYDRA Rocket System
The family of Hydra 70 rockets performs a number of roles including anti-materiel, anti-personnel, and air-to-ground suppression missions. The rockets also provide smoke-screening and illumination functions. The family of Hydra 70 rockets are fired from Apache, Cobra, and Kiowa Warrior helicopters by the Army and are fired from various other fixed-wing and rotary-wing platforms by Special Operations Forces, the Marine Corps, the U.S.Navy, and the Air Force. The 2.75 inch rocket is a free-flight rocket that has become the standard ground-attack rocket and was used extensively in the Korean War, Vietnam, and Desert Storm.
The warheads contained on the HYDRA 70 rocket fall into three categories: (1) Unitary warheads with an impact-detonating fuze or a remote-set, multi-option fuze; (2) Cargo warheads with an airburst, range-settable fuze using the "wall-in-space" concept, or a fixed-standoff fuze; and (3) Practice warheads.
HYDRA 70 Rocket Motor, MK66
HYDRA 70 Rockets are free-flight rockets which mate either unitary or cargo warheads with the MK66 Rocket Motor. The MK66 motors have a substantially higher thrust at 1,335 lb and a longer range (8.8km) with a 10lb warhead.
HYDRA 70 Rocket Launchers
The U.S. Army Light Weight Launchers (LWL) are the M260 (7-tube) and the M261 (19-tube) launchers. The aluminum launchers are inexpensive enough to be disposable yet durable enough to be reused after as many as 32 firings. The weight savings over the previous Army launchers allows the Army to add other features to the aircraft’s rocket system for improved performance. The launcher permits fuze-timing selection from the cockpit and will launch rockets using either the MK40 or the MK66 motors. The empty M260 launcher weight is approximately 35lb. The weight of a fully loaded M260 launcher varies from 196.2lb to 317.7lb as a function of which warhead is carried.
M261 Multi-Purpose Submunition (MPSM)
The MPSM HE warhead provides improved lethal effectiveness against area targets such as light armor, wheeled vehicles, materiel, and personnel. The Submunitions are deployed over the target and descend nearly vertical. The M73 Grenades are shaped charges with fragmentation dispersing 10-grain fragments radially over 360deg. The M261 Warhead is a cargo warhead consisting of a nose cone assembly, a warhead case, an integral fuze, nine submunitions, and an expulsion charge assembly. The primary warhead fuze (M439) is remotely set with the Aerial Rocket Control System (ARCS), Multifunctional Display (MFD) or Rocket Management System (RMS) to provide range (time of flight) from 500ms to 7200m.
The M255A1 flechette warhead is used primarily against antipersonnel targets: this warhead contains 1,179 sixty-grain, hardened steel flechettes and uses the M439 fuze. Currently this warhead is type classified for Special Operations Forces (SOF) only. The M255A1 Warhead is a cargo warhead consisting of a nose cone assembly, a warhead case, an integral fuze, 1,179 sixty-grain flechettes, and an expulsion charge assembly. The primary warhead fuze (M439) is remotely set with the ARCS, MFD or RMS to provide range (time of flight) from 500m to 7200m. The warhead weight is 13.9lb. When mated to the MK66 motor, the live weight is 27.5 pounds while the fired weight is 20.3lb. The overall M255A1 Rocket length is 66.10in.
M151 HEPD "The 10-Pounder"
This is a 10lb, high explosive, anti-personnel, anti-material warhead and is traditionally referred to as the 10-Pounder. The bursting radius is 10m; however, high velocity fragments can produce a lethality radius in excess of 50m. This warhead is normally employed against personnel, materiel, and lightly armored vehicles. The nose section is constructed of malleable cast iron that is threaded to receive the fuze. The base section is constructed of steel or cast iron and is threaded so that it can be attached to the rocket motor. Total weight of the loaded, unfuzed warhead is 8.7lb of which 2.3lb is composition B4. The M151 warhead weighs 9.3 pounds when fuzed with the M423/M427 point detonating fuze. Rocket live weight is 23lb while the fired weight is 15.7lb.
These warheads were designed for battlefield target illumination; the M278 in conjunction with Infrared (IR) goggles. The only difference between the warheads is the candle composition. The flare warheads are assembled to the MK66 Rocket Motor in the field. The flare rockets can be launched from either fixed-wing or rotary-wing aircraft. The M442 motor burnout fuze functions after a 9-sec delay. The M278 provides an average near IR light output of 250 W/SR and less than 2K candle power of visible light with a desired goal of 1K candle power. The IR flare will provide IR light for 3 minutes. Time to candle ignition from launch is 13.5sec. The M257 candle descends at 15 ft/sec and burns for approximately 100secs with a minimum light output of one million candle power. Warhead weight is 10.6lb. M278 Rocket weight is 24.2lb live and 17lb fired.
M264 RP Smoke
The M264 Warhead is used for smoke obscuration in the visible light spectrum. The pellets can be easily modified for fill content to obscure IR and millimeter-wave spectrums should a requirement materialize. The M264 RP Smoke is used as a red phosphorus (RP) filled smoke rocket propelled by the MK66 motor and functions at a remote settable range from 1,000 to 6,000m. The burning RP drops to the ground producing a voluminous cloud of white smoke. Fourteen M264 rockets will screen a 300- to -400m front with a 15- to10kt wind from the unaided eye for a minimum of 5 minutes. The warhead weight is 8lb. The M264 Rocket weight is 21.6lb live and 14.4lb fired.
AWM-101A Test Set Guided Missile System
The AN/AWM-101A test set provides a test capability on the AH-64A and AH-64D aircraft for the HELLFIRE weapon system (less the missile). It identifies failures not detectable by BIT, identifies faulty LRUs, and confirms the aircraft has the ability to launch missiles. It is combatable with the Integrated Family Test Equipment (IFTE), Maintenance Support Device (MSD).
AN/TSM-205 Test Set Guided Missile System
The AN/TSM-205 Test Set provides a test Capability on the AH-64A for the HELLFIRE system weapon system (less) missile, giving the maintainer confidence that the system will fire missiles when required. Additionally, it provides an off-aircraft test capability for flight-line stand-alone test on the M272 and M279 launchers, and Electronic Command Signal Programmer (ECSP). When testing the M272 or M279, it provides troubleshooting to the ECSP or wiring harness levels, with fault isolation and detection to SRUs and LRUs.
The Launcher Test Station (LTS)
The LTS provides an off-aircraft test Capability for the M272, M279, and M299 launchers. When testing the M299, it provides troubleshooting to the LRU level (LEA or wiring harness), and fault isolation and detection to the LEA SRU level. It is also capable of reprogramming the M299 LEA. When testing the M272 and M279 it provides troubleshooting to the LRU level (ECSP or wiring harness). Additionally, the LTS will also test the M36 Training missile. Associated equipment required are AN/AWM-101A and MSD.
COL James S Romero
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