RP-3

RP-3
assumed British Government · Public domain · source
Name	RP-3
Caption	An RP-3 rocket mounted on a Hawker Typhoon.
Type	Air-to-surface rocket
Origin	United Kingdom
Service	1943–1968
Used by	Royal Air Force, Royal Navy, Royal Canadian Air Force, South African Air Force
Wars	Second World War, Korean War, Malayan Emergency
Designer	Ministry of Aircraft Production
Design date	1943
Manufacturer	Various, including Imperial Chemical Industries
Number	Over 2 million
Variants	See text
Weight	45 lb (20 kg)
Length	55 in (1.4 m)
Diameter	3 in (76 mm)
Filling	High explosive, Armour-piercing
Engine	Solid-fuel rocket
Engine power	1,400 lbf (6.2 kN) for 1.1 sec
Velocity	1,200 ft/s (370 m/s)
Range	1,600 yd (1,500 m)
Guidance	None
Launch platform	Hawker Typhoon, Hawker Tempest, de Havilland Mosquito, Fairey Swordfish, Supermarine Seafire

RP-3. The RP-3 was a British unguided air-to-surface rocket projectile extensively used during the latter half of the Second World War. Developed to provide aircraft with a potent stand-off attack capability against hardened targets, it became a signature weapon for Royal Air Force fighter-bombers, particularly the Hawker Typhoon. Its success led to widespread post-war use by British and Commonwealth forces in conflicts like the Korean War.

Development and design

The development of the RP-3 was driven by the Royal Aircraft Establishment at Farnborough Airfield following research into solid-fuel rocket motors. The design centered on a simple 3-inch (76 mm) steel tube motor, developed with expertise from Imperial Chemical Industries, attached to a variety of warheads. The most common were a 25 lb (11 kg) high-explosive head for soft targets and a 60 lb (27 kg) armour-piercing concrete-piercing head, the latter designed to penetrate U-boat pens and battleship armor. The rocket was stabilized in flight by four fins that unfolded after launch from rails mounted under the wings of aircraft like the Hawker Hurricane and Bristol Beaufighter.

Operational history

The RP-3 entered service in 1943, with its first major combat use occurring during the Normandy landings and the subsequent Battle of Normandy. The Hawker Typhoon units of the Second Tactical Air Force became especially renowned for their devastating rocket attacks on German armor, notably during the Falaise pocket encirclement. The Royal Navy's Fleet Air Arm employed them from Fairey Swordfish and Supermarine Seafire aircraft against shipping and coastal installations. After the war, the rocket saw continued action; during the Korean War, Royal Australian Air Force Gloster Meteor jets and Royal Navy Hawker Sea Fury propeller aircraft used RP-3s extensively in ground attack roles against Korean People's Army forces and infrastructure.

Specifications

The standard RP-3 rocket motor was 55 inches (1.4 m) long and weighed approximately 45 pounds (20 kg). It produced 1,400 pounds-force (6.2 kN) of thrust for about 1.1 seconds, accelerating the projectile to a velocity of 1,200 feet per second (370 m/s). Effective range was around 1,600 yards (1,500 m), though accuracy diminished significantly beyond 800 yards. The rocket could be fitted with different warheads, with the 60-pound concrete-piercing variant achieving notable success against fortified positions. Launch rails were typically installed in pairs or quadruple mounts on aircraft like the de Havilland Mosquito and Hawker Tempest.

Variants

Several key variants of the RP-3 were produced, differentiated primarily by their warheads. The 25 lb MK I and II high-explosive heads were used for anti-personnel and anti-vehicle work. The 60 lb MK I armour-piercing head, often called the "60 lb SAP," was for attacking hardened targets. A specialized 60 lb "solid shot" practice head was also common. Post-war developments included improved fuzes and the "Triplex" head, which contained three separate explosive charges. These were used on later aircraft such as the English Electric Canberra and the Hawker Hunter during conflicts like the Malayan Emergency.

Impact and legacy

The RP-3 had a profound impact on Allied close air support doctrine, proving exceptionally effective in the hands of pilots from the Royal Canadian Air Force and South African Air Force. It provided a template for post-war NATO air-to-ground rocket development, influencing American designs like the HVAR used during the Korean War. The weapon remained in service with the Royal Air Force until the late 1960s, its last operational use likely with Hawker Hunter aircraft. Its development history is closely tied to institutions like the Ministry of Aircraft Production and its combat record is a staple in histories of the Second Tactical Air Force and the Falaise pocket.

Category:Rockets and missiles Category:World War II British rockets Category:Aircraft weapons of the United Kingdom