Extending the Reach: A New Era for Howitzers

Conventional howitzers are on the cusp of a significant upgrade, possibly achieving ranges previously exclusive to rocket artillery systems. The Ramjet 155 artillery shell, currently under development, promises to extend the reach of standard howitzers to an extraordinary 150 kilometers. This advancement, showcased by the Army Recognition portal, marks a pivotal moment in artillery technology, promising to reshape battlefield strategies.

The Strategic Advantage: Outranging the Enemy

according to Thomas Danbolt, Vice President of Large Caliber Ammunition at Nammo, the extended range offered by the Ramjet 155 provides a crucial strategic advantage.

If you can shoot much further than an opponent,you eliminate the threat of counterbatery fire. Your own artillery remains safe, while you can attack the opponent’s positions with impunity. This kind of advantage will significantly change the dynamics of the battlefield.
Thomas Danbolt,Nammo

This capability allows artillery units to engage enemy positions with impunity,minimizing the risk of counter-battery fire and significantly altering the balance of power on the battlefield. This advantage is particularly relevant in modern warfare scenarios where maintaining a safe distance is paramount.

the Science of Range: Propelling Projectiles Further

Conventional artillery shells are propelled by expanding gases produced from burning propellant. The longer the barrel, the greater the acceleration and muzzle velocity. For instance,a 155mm howitzer with a 39-caliber barrel typically has a chamber capacity of 18.7 liters, while a 52-caliber barrel increases this to 23 liters. However, increasing muzzle velocity also accelerates barrel wear, posing a significant engineering challenge. While European manufacturers have successfully produced 52-caliber barrels, the U.S. Army’s ERCA program explored even longer 58-caliber cannons.

Choice Approaches: Gas Reduction and Rocket Boosters

Beyond barrel length, other methods exist to enhance artillery range. One approach involves using a gas-reducing base bleed, which can increase range by approximately 30%. Another common technique is incorporating a rocket booster to provide additional acceleration after the shell leaves the barrel. while rocket-assisted projectiles can reach distances of up to 60 kilometers, they require sacrificing payload space for the rocket motor and fuel.

The Ramjet Innovation: A Stream Engine Solution

The Finnish Ramjet 155 utilizes a unique approach, employing a ramjet engine rather of a traditional rocket. Unlike rockets, ramjets do not require an oxidizer within the fuel composition. Instead, they draw oxygen from the atmosphere through an intake, compressing it before it enters the combustion chamber. This design allows for a larger fuel load compared to rocket-assisted projectiles, such as the M549A1, enabling the engine to operate for a longer duration.

Precision and Guidance: Hitting the Mark at Extreme Ranges

The developers of the Ramjet 155 claim exceptional accuracy, stating the ability to hit within the confines of a football field at a distance of 150 kilometers.While the exact guidance system remains undisclosed, it likely involves a combination of satellite and inertial navigation, or potentially other advanced technologies. Precise guidance systems are crucial for maximizing the effectiveness of long-range artillery.

Implications for Existing Systems: A Force Multiplier

The Ramjet 155 is designed for compatibility with existing artillery systems, such as the Polish Krab and French Caesar, effectively enhancing their capabilities. However, engaging targets at such extended ranges presents new challenges in target detection and acquisition. One proposed solution involves utilizing F-35A fighter aircraft as forward observers, providing targeting data for artillery units equipped with Ramjet 155 shells. This highlights the increasing importance of integrated sensor networks and joint operations in modern warfare.