DRACO Commercial 40mm HE Grenade

Overview

The DRACO (Direct Range Air Consuming Ordnance) is an enhanced blast 40mm low-velocity multi-purpose grenade that represents a significant advancement in thermobaric munitions technology for hand-held grenade launchers. Manufactured by Martin Electronics, Inc. (MEI), now part of Chemring Ordnance, the DRACO is specifically engineered to deliver superior performance against both troops in the open and in Military Operations in Urban Terrain (MOUT) environments. The grenade employs an Enhanced Blast Explosive (EBX) compound that produces devastating overpressure effects, making it particularly effective in enclosed spaces such as buildings, bunkers, and cave systems. The DRACO’s thermobaric characteristics provide enhanced lethality compared to conventional high-explosive rounds while maintaining compatibility with standard 40×46mm grenade launchers.

Country/Bloc of Origin

Country: United States of America

Manufacturer: Martin Electronics, Inc. (MEI), later acquired by Chemring Ordnance

Development Period: Early 2000s (circa 2004-2005)

Distribution: Primarily used by U.S. military forces, particularly Special Operations units, U.S. Marine Corps, and allied nations. The round was developed for and tested with U.S. Special Operations Command (USSOCOM) and various special warfare units requiring enhanced lethality in confined space operations.

Ordnance Class

Primary Classification: Thermobaric Grenade / Enhanced Blast Munition

Secondary Classification: Multi-Purpose High-Explosive

Delivery Method: Hand-launched from 40×46mm low-velocity grenade launchers

Target Set:

Personnel in enclosed spaces (buildings, bunkers, caves)
Light fortifications and structures
Troops in the open (secondary capability)
Area denial operations

Operational Environment: Optimized for MOUT/CQB (Close Quarters Battle) operations, particularly effective in urban warfare scenarios where overpressure effects are maximized in confined spaces.

Ordnance Family/Nomenclature

Official Designation: DRACO 40mm Low Velocity Multi-Purpose Grenade

Acronym: DRACO – Direct Range Air Consuming Ordnance

NATO Classification: 40×46mm Low-Velocity (LV) round

Compatible Weapons:

M79 grenade launcher
M203 grenade launcher (attached to M16/M16A1/M16A2 rifles)
M320 Grenade Launcher Module
Milkor MGL Mk-1 and MGL-140 multiple grenade launchers

Related Variants:

MEI HELLHOUND (non-thermobaric predecessor with conventional A5 explosive)
MEI Mercury (extended range variant)

Commercial Status: Commercial/military sales designation, not assigned a standard U.S. military “M” designation

Hazards

Primary Hazards:

Blast Overpressure:

Generates intense blast overpressure through thermobaric effect
Particularly dangerous in enclosed spaces where pressure wave cannot dissipate
Can cause severe internal injuries, ruptured organs, and traumatic brain injury
Overpressure effects extend beyond visible fragmentation pattern

Fragmentation:

Steel projectile body fragments upon detonation
Produces anti-personnel fragmentation pattern
Lethal fragmentation radius: approximately 5 meters
Injury radius extends beyond lethal radius

Thermal Effects:

Enhanced Blast Explosive (EBX) produces significant heat signature
Secondary fires possible in combustible environments
Flash effect can cause temporary blindness at close range

Sensitivity Characteristics:

Impact-sensitive fuze (M550/SF801 type)
Arms after 15-30 meters of flight
Safe separation distance required from firer
Setback arming mechanism activates during launch
All-ways impact sensitive after arming

Environmental Hazards:

UXO presents extreme danger if round fails to detonate
Pressurized components may remain unstable
Degradation of fuze components over time increases sensitivity

Handling Precautions:

Requires trained personnel only
Storage temperature critical: 60-75°F recommended
Pressure-sensitive components require careful handling
Extreme temperature exposure can affect performance and safety

Minimum Safe Distance:

Firer: 30+ meters (after arming distance)
Friendly forces: 50+ meters recommended
Danger close: Not recommended within 100 meters of friendly positions

Key Identification Features

Physical Dimensions:

Length: 120mm (4.72 inches)
Diameter: 40mm (1.57 inches)
Weight: 225 grams (7.9 ounces) total
Explosive Fill: 90 grams of Enhanced Blast Explosive (EBX/YJ05)

Body Construction:

Material: Steel projectile body
Color: Typically olive drab or dark gray military finish
Surface Texture: Smooth metal finish with rotating band

Distinctive Features:

Rotating Band: Copper or brass colored driving band near base of projectile
Ogive: Rounded nose cone design
Fuze Assembly: Point-initiating, base-detonating fuze mounted in nose
Cartridge Case: Standard 40×46mm aluminum case with high-low pressure chamber

Markings:

Manufacturer markings: “MEI” or “Martin Electronics”
Lot number and date of manufacture
“DRACO” nomenclature may be stenciled
Explosive fill designation: “EBX” or “YJ05”
Warning labels indicating thermobaric content

Visual Comparison:

Slightly longer than standard M433 HEDP (110mm vs 120mm)
Similar profile to HELLHOUND with steel body construction
Distinguishable from training rounds by live fuze assembly
Heavier than standard HE rounds due to increased explosive fill

Fuzing Mechanisms

Fuze Type: SF801/M550 Point-Initiating, Base-Detonating (PIBD) Fuze

Arming Sequence:

Stage 1 – Safe State (0-15 meters):

Fuze remains in safe configuration during loading and initial launch
Firing pin held out of alignment with detonator
Centrifugal safety mechanisms engaged
Setback safety prevents premature detonation

Stage 2 – Arming (15-30 meters):

Setback force during launch withdraws firing pin from rotor detent
Centrifugal force from projectile spin causes rotor ball to align
Detonator rotates into alignment with firing pin
Safety mechanisms disengage
Fuze fully armed after approximately 15-30 meters of flight

Stage 3 – Impact Detonation:

Upon target impact, inertial forces drive firing pin into detonator
Detonator initiates spit-back charge
Spit-back charge creates jet that initiates explosive train from base forward
EBX compound detonates, consuming atmospheric oxygen
Shaped charge jet penetrates target
Secondary overpressure wave created by thermobaric reaction

Fuze Features:

Safe and Arm (S&A) technology prevents accidental detonation
All-ways impact sensitive after arming
No self-destruct mechanism (unlike some high-velocity 40mm rounds)
Point-initiating ensures detonation on first contact
Base-detonating explosive train maximizes effectiveness

Thermobaric Effect:

EBX compound requires atmospheric oxygen for full effect
Primary detonation disperses explosive particles
Secondary detonation consumes oxygen and creates massive overpressure
Creates vacuum effect after initial overpressure wave
Enhanced effectiveness in enclosed spaces where oxygen is limited

Safety Mechanisms:

Mechanical setback safety
Centrifugal rotor safety
Positive arming indication (rotor alignment)
Requires 15-30 meter flight distance to arm
Safe handling during transport and loading

History of Development and Use

Development Context (Early 2000s):

The DRACO was developed by Martin Electronics, Inc. during the early years of Operation Iraqi Freedom and Operation Enduring Freedom, when U.S. forces faced increasing challenges in urban combat environments. The conflicts in Iraq and Afghanistan highlighted the need for more effective munitions against fortified positions, insurgents in buildings, and cave complexes used by enemy forces. Conventional high-explosive rounds, while effective in open terrain, often lacked the overpressure effects necessary to neutralize threats in enclosed spaces without requiring multiple rounds.

Design Philosophy:

MEI recognized the limitations of their existing HELLHOUND round and sought to develop a specialized thermobaric variant that could deliver enhanced blast effects while maintaining the form factor of standard 40×46mm low-velocity ammunition. The DRACO incorporated Enhanced Blast Explosive (EBX), a thermobaric compound that offered superior performance against enclosed targets compared to conventional explosives like Composition A5. The name “Direct Range Air Consuming Ordnance” reflected the round’s thermobaric mechanism, which consumes atmospheric oxygen to create devastating overpressure effects.

Technical Innovation:

The DRACO represented a significant technological achievement in miniaturizing thermobaric technology for man-portable weapons. Previously, thermobaric effects were primarily available in larger weapon systems like the RPO-A Shmel rocket or air-dropped bombs. The DRACO made this technology available to individual grenadiers and small unit tactics, providing squad-level precision thermobaric capability.

Military Adoption and Testing (2004-2006):

The DRACO underwent extensive testing with U.S. Special Operations Command (USSOCOM), U.S. Marine Corps, and U.S. Navy SEALs beginning in 2004-2005. Initial field evaluations occurred at Fort Benning, Georgia, and at specialized MOUT training facilities. The round demonstrated exceptional effectiveness in room-clearing operations and against fortified positions, significantly outperforming standard M433 HEDP rounds in overpressure generation.

Special Operations units were particularly interested in the DRACO’s capabilities for cave clearing operations in Afghanistan and urban operations in Iraq. The round’s ability to neutralize threats behind walls and in multi-room structures made it valuable for high-risk warrant service, hostage rescue scenarios, and counterinsurgency operations where collateral damage needed to be minimized while ensuring complete target neutralization.

Operational Employment:

The DRACO saw limited but effective use with special operations forces and select conventional units during operations in Iraq and Afghanistan. Its high unit cost (significantly more expensive than standard rounds) limited widespread adoption, but units that employed it reported exceptional results in specific tactical scenarios. The round proved particularly valuable in:

Cave and tunnel clearing operations in Afghanistan
Urban room-clearing in Iraqi cities
Bunker neutralization missions
Counter-sniper operations against fortified positions
Counter-IED emplacement team engagement

Relationship to HELLHOUND:

The DRACO was developed as a specialized variant of the MEI HELLHOUND round, sharing the same basic projectile body and fuze system but incorporating the thermobaric EBX fill instead of conventional A5 explosive. This allowed MEI to leverage existing manufacturing processes while offering customers a choice between conventional HEDP (HELLHOUND) and thermobaric (DRACO) capabilities depending on mission requirements.

Commercial Success and Limitations:

While technically successful, the DRACO faced challenges in achieving widespread military adoption:

Cost Factors: The specialized EBX explosive and manufacturing complexity made each DRACO round significantly more expensive than conventional 40mm ammunition. This limited procurement quantities and restricted use to high-value tactical scenarios.

Niche Application: The thermobaric effect, while devastating in enclosed spaces, offered less advantage in open terrain compared to conventional HE rounds. This made the DRACO a specialized tool rather than a general-purpose replacement for existing ammunition.

Competition: Other manufacturers developed competing enhanced lethality 40mm rounds, including extended-range variants and airburst munitions, which offered different tactical advantages.

Current Status (2026):

The DRACO remains in limited production under Chemring Ordnance (which acquired Martin Electronics) and continues to be available for military and law enforcement procurement. While never achieving widespread deployment, it maintains a reputation as a highly effective specialized munition for specific tactical scenarios. Modern variants may incorporate improved explosive formulations and updated safety features, but the basic DRACO concept remains relevant for urban warfare and counterterrorism operations.

Legacy and Influence:

The DRACO’s development influenced subsequent thermobaric weapon programs and demonstrated the feasibility of miniaturizing advanced explosive technologies for man-portable weapons. Its success encouraged other manufacturers to explore enhanced blast munitions, contributing to the broader evolution of 40mm grenade technology beyond conventional HE and HEDP rounds.

Technical Specifications

Physical Characteristics:

Total Length: 120mm (4.72 inches)
Projectile Diameter: 40mm (1.57 inches)
Total Weight: 225 grams (7.9 ounces)
Explosive Fill Weight: 90 grams EBX/YJ05
Body Material: Steel
Fuze Type: SF801/M550 PIBD

Ballistic Performance:

Muzzle Velocity: 80 m/s (262 fps)
Maximum Effective Range: 400 meters (437 yards)
Point Target Range: 150 meters
Area Target Range: 350-400 meters
Arming Distance: 15-30 meters (49-98 feet)

Explosive Characteristics:

Main Fill: Enhanced Blast Explosive (EBX) / YJ05
Fill Weight: 90 grams (3.2 ounces)
Detonation Type: Thermobaric
Lethal Radius: ~5 meters in open terrain
Enhanced Lethal Radius: ~8-10 meters in enclosed spaces
Casualty Radius: ~15 meters

Penetration Performance:

Armor Penetration: 65mm mild steel at normal impact
Masonry Penetration: 300mm (12 inches) concrete block
Wood Penetration: 400mm (16 inches) pine logs
Sandbag Penetration: 500mm (20 inches)

Fuze Specifications:

Type: Point-Initiating, Base-Detonating
Arming Mechanism: Setback and centrifugal
Safety Features: Dual mechanical safeties
Sensitivity: All-ways impact after arming
Failure Rate: <1% dud rate (estimated)

Environmental Specifications:

Operating Temperature: -40°F to +160°F (-40°C to +71°C)
Storage Temperature: 60°F to 75°F (15°C to 24°C) recommended
Humidity Tolerance: <60% relative humidity for optimal storage
Shelf Life: 10-20 years under proper storage conditions

Compatibility:

Launcher Systems: All NATO-standard 40×46mm LV grenade launchers
Launch Method: High-low pressure propulsion system
Chamber Pressure: Low-pressure (high-low system)

Operational Characteristics:

Rate of Fire: Limited by launcher (M79: 5-7 rounds/min, M203: 5-7 rounds/min, MGL: 18-21 rounds/min sustained)
Deployment Altitude: Sea level to 10,000 feet
Wind Drift: Moderate at extended ranges
Trajectory: Ballistic arc (similar to M433)

Frequently Asked Questions

Q: How does the DRACO’s thermobaric effect differ from conventional high-explosive grenades?

A: The DRACO utilizes Enhanced Blast Explosive (EBX), which functions as a thermobaric weapon rather than a conventional explosive. Upon detonation, the EBX compound first disperses explosive particles into the surrounding atmosphere, then ignites in a secondary detonation that consumes available oxygen. This two-stage process creates a significantly more powerful and sustained overpressure wave compared to conventional explosives. In enclosed spaces like buildings or bunkers, the overpressure wave reflects off walls and ceilings, multiplying the destructive effect. The vacuum created after the initial overpressure wave can cause additional damage to structures and personnel. This makes the DRACO far more effective than rounds like the M433 HEDP in confined environments, where it can neutralize threats behind walls or in multiple rooms with a single detonation.

Q: Why is the DRACO more expensive than standard 40mm rounds, and does this limit its practical use?

A: The DRACO’s higher cost stems from several factors: the specialized EBX thermobaric compound requires more complex manufacturing processes than conventional explosives, the steel body construction is more expensive than aluminum, and lower production volumes prevent economies of scale. Additionally, the Enhanced Blast Explosive has stricter quality control requirements and more sophisticated storage needs. In practice, this cost differential (estimated at 3-5 times the price of standard M433 rounds) does limit procurement and deployment. Military units typically reserve DRACO rounds for specific high-value missions such as cave clearing, bunker neutralization, or critical urban operations where its enhanced effectiveness justifies the expense. For routine operations or training, units rely on more economical conventional rounds.

Q: What makes the DRACO particularly effective in Military Operations in Urban Terrain (MOUT)?

A: Urban environments present unique challenges where conventional explosives often underperform due to the prevalence of walls, rooms, and enclosed spaces. The DRACO’s thermobaric mechanism excels in these scenarios because overpressure waves cannot dissipate in confined areas, instead reflecting and amplifying off solid surfaces. This means a single DRACO round fired into a room can neutralize threats in that room and potentially adjacent rooms through wall penetration and pressure transmission. The combination of initial shaped charge penetration (65mm steel, 300mm concrete) followed by the thermobaric blast allows the DRACO to defeat both the structure and occupants. This reduces the number of rounds needed to clear a building compared to conventional HE or HEDP ammunition, providing tactical advantage in room-clearing operations while reducing ammunition expenditure and exposure time for assaulting forces.

Q: How does the arming distance of 15-30 meters affect tactical employment of the DRACO?

A: The arming distance creates both safety benefits and tactical limitations. The positive aspect is that the DRACO cannot detonate if accidentally dropped or if it strikes an object very close to the firer, protecting friendly forces from fratricidal incidents. However, this arming distance means the DRACO is ineffective at very close ranges (under 15 meters), which can be problematic in extremely close-quarters combat or when engaging targets in narrow alleys or corridors. Tactical employment requires grenadiers to maintain appropriate standoff distances, which may necessitate exposing themselves to fire while moving to an effective firing position. In practice, this isn’t usually a significant limitation since most 40mm engagements occur beyond 30 meters, and closer threats are typically engaged with small arms fire. The safety benefits generally outweigh the tactical restrictions, as the alternative—an immediately armed round—would pose unacceptable risks to friendly forces.

Q: Can the DRACO be fired from all 40mm grenade launchers, and does it have any special firing considerations?

A: The DRACO is compatible with all standard NATO 40×46mm low-velocity grenade launchers, including the M79, M203, M320, and Milkor MGL series, without requiring any modifications. It uses the same high-low propulsion system as other 40mm LV rounds and produces similar recoil characteristics. However, several special considerations apply: First, due to its enhanced blast effects, minimum safe distance for friendly forces should be increased from standard HE engagement distances (50+ meters recommended versus 30 meters for conventional rounds). Second, the thermobaric effect is significantly reduced in open terrain with good air circulation, so tactical situations should favor enclosed or confined target areas to maximize effectiveness. Third, the steel body makes the round slightly heavier than aluminum-bodied rounds, which may affect sustained carry loads in extended operations. Finally, users should be aware that the overpressure effect can damage equipment and structures beyond the immediate target area, requiring careful consideration of collateral damage in sensitive environments.

Q: What are the storage and handling requirements for the DRACO, and how do they differ from conventional 40mm ammunition?

A: While the DRACO can be handled using standard 40mm ammunition procedures, optimal performance and safety require some additional considerations. Storage temperature is more critical than with conventional rounds—the manufacturer recommends 60-75°F (15-24°C) with relative humidity below 60%. Exposure to extreme heat (above 100°F) or extreme cold (below -20°F) can degrade the EBX compound’s performance and potentially affect fuze reliability. Unlike some conventional explosives that are relatively stable across temperature ranges, thermobaric compounds are more sensitive to thermal cycling. Rounds should remain sealed in their shipping containers until ready for use and should never be stored in vehicle trunks or exposed locations for prolonged periods. During handling, the standard safety procedures apply: treat all rounds as live, avoid dropping or impacting the fuze assembly, and maintain awareness of the arming distance. The DRACO’s steel body makes it more resistant to damage than aluminum-bodied rounds, but the fuze assembly remains the most vulnerable component and requires careful handling.

Q: How does the DRACO compare to the HELLHOUND round, and when would you choose one over the other?

A: The DRACO and HELLHOUND are closely related rounds sharing the same steel body construction and fuze system, but they employ different explosive fills for different tactical purposes. The HELLHOUND uses conventional A5 explosive (88 grams) and is designed as an improved HEDP round with enhanced fragmentation and penetration compared to the M433. It performs well in both open terrain and enclosed spaces, making it a versatile general-purpose round. The DRACO, with its 90-gram EBX thermobaric fill, is optimized specifically for enclosed spaces and generates significantly greater overpressure effects. In tactical terms: choose HELLHOUND for general-purpose engagements, open terrain combat, light vehicle targets where penetration is the primary goal, and when cost is a significant factor. Choose DRACO for bunker and cave operations, urban building clearing where maximum overpressure is desired, multi-room clearance where pressure effects can reach through walls, and high-value targets where enhanced lethality justifies the higher cost. Many units maintain stocks of both rounds to provide tactical flexibility based on mission requirements.

Q: Are there any safety concerns or medical considerations specific to thermobaric weapons like the DRACO?

A: Thermobaric weapons create unique injury patterns that differ from conventional explosives, requiring specific medical awareness. The primary mechanism of injury is overpressure, which can cause traumatic brain injury (TBI), ruptured eardrums, collapsed lungs, and internal organ damage without visible external trauma. Unlike fragmentation wounds which are immediately apparent, overpressure injuries may not be evident until hours after exposure. Personnel exposed to thermobaric detonations should be medically evaluated even if they appear uninjured. The vacuum effect following the initial overpressure can cause additional respiratory trauma. From a safety perspective, friendly forces must maintain greater standoff distances (50+ meters versus 30 meters for conventional HE) due to the enhanced blast radius. The overpressure effect can be amplified by terrain features, vegetation, and structures in ways that aren’t intuitive, potentially creating danger zones beyond expected ranges. In enclosed spaces, even personnel in adjacent rooms may be affected by pressure transmission through walls. Medical personnel supporting operations involving thermobaric weapons should be briefed on overpressure injury recognition and treatment, and commanders should ensure adequate medical evacuation capabilities are available for missions employing DRACO rounds.

This lesson is intended for educational and training purposes. All ordnance should be considered dangerous until proven safe by qualified personnel. Unexploded ordnance should never be handled by untrained individuals—report findings to military or law enforcement authorities.