The RB-04 (Robot 04) is a long-range

sea skimming Sea skimming is a technique many anti-ship missiles and some fighter or strike aircraft use to avoid radar, infrared detection, and to lower probability of being shot down during their approach to the target. Method Sea-skimming anti-ship missi ...

fire-and-forget Fire-and-forget is a type of missile guidance which does not require further external intervention after launch such as illumination of the target or wire guidance, and can hit its target without the launcher being in line-of-sight of the targe ...

air-to-surface An air-to-surface missile (ASM) or air-to-ground missile (AGM) is a missile designed to be launched from military aircraft at targets on land or sea. There are also unpowered guided glide bombs not considered missiles. The two most common prop ...

anti-ship missile An anti-ship missile (AShM) is a guided missile that is designed for use against ships and large boats. Most anti-ship missiles are of the sea skimming variety, and many use a combination of inertial guidance and active radar homing. A good ...

. The missile was known as the "RB-304" during development and early service years.

Development

While interest in guided anti-ship missiles was subdued in the 1950s, it was not entirely extinct. In 1949, the Swedish government placed a request for a radar-guided, air-launched anti-ship missile. The request materialized as the SAAB "Robot-Byrån (RB) 04", which was first test launched by a

Saab 29 Tunnan The Saab 29 ''Tunnan'', colloquially ''Flygande tunnan'' or just ''Tunnan'' ( en, "The flying barrel", "The barrel"),. is a Swedish fighter that was designed and manufactured by Saab in the late 1940s. It was the second turbojet-powered combat ...

fighter in early 1955. The early versions of the missile suffered teething problems in regards to the two targeting modes, which were area attack, for striking a big group of ships (like an invasion fleet), and select targeting, where the missiles home in on a single vessel. In the area attack the missile would only target a ship in the group if they were within 1,000 meters of another vessel, this was also in the early electronic age, and changes in this distance required hardware modifications in a workshop. Many components of the missile were reused when the

RBS-15 The RBS 15 (Robotsystem 15) is a long-range fire-and-forget surface-to-surface and air-to-surface anti-ship missile. The later version Mk. III has the ability to attack land targets as well. The missile was developed by the Swedish company Saab ...

was developed, including the main body and warhead, although the motor and main wings were the most obvious external changes.

Variants

*RB-04C: The initial production version, the "RB-04C", entered service with Swedish Air Force A 32A Lansen attack aircraft in 1959. The RB-04C had a canard configuration, with short triangular cruciform fins around the nose, and two wide wings with fins attached to the wingtips. The RB-04C had a boost-sustain solid rocket motor and a SAP warhead that could be fitted with a contact or proximity fuse. *RB-04D: Further development of the C version. Longer range rocket engines and maintenance free thermal batteries where the main improvements. Introduced in the late 1960s. *RB-04E: Further development of the D version to suit the new AJ37 Viggen strike aircraft. The missile had a shorter wingspan and improved guidance system and new

monopulse radar Monopulse radar is a radar system that uses additional encoding of the radio signal to provide accurate directional information. The name refers to its ability to extract range and direction from a single signal pulse. Monopulse radar avoids prob ...

seeker. This version was highly resistant to ECM and would automatically lock on especially powerful jamming signals.

Operational use

The missile has never seen combat; the closest it has come to being used was during the " Whiskey on the Rocks" incident in 1981, when a Soviet (NATO code Whiskey Class) submarine ran aground outside the naval station in

Karlskrona Karlskrona (, , ) is a locality and the seat of Karlskrona Municipality, Blekinge County, Sweden with a population of 66,675 in 2018. It is also the capital of Blekinge County. Karlskrona is known as Sweden's only baroque city and is host to Swed ...

. Swedish AJ37 Viggens with RB-04E's mounted under their wings, taken from top secret storage bunkers, stood on high alert for a possible Soviet incursion. On one occasion, when a Soviet rescue operation seemed to be underway, aircraft were scrambled with the intent to intercept Soviet ships.

References

{{Reflist *Svenskt Militärflyg - Bo Widfeldt / Åke Hall (2005) *An Illustrated Guide To Modern Airborne Missiles - Bill Gunston, Arco Publishing, Inc. (1983)

External links

"Swedish Air Force Has Rocket Powered Missiles"
''Popular Mechanics'', April 1958, p. 112 - note that photo caption is wrong in stating that it is an air-to-air missile. Anti-ship missiles of Sweden Anti-ship missiles of the Cold War Weapons of Sweden