From Atlas
Type Air-to-air missile
Place of origin Granzery
Service history
In service 1958–1991
Used by Granzerian People's Air Force
Granzerian Republican Air Force
Production history
Manufacturer Juhasz State Design Bureau (before 1971)
Vertega Aerospace (after 1971)
Weight 93 kilograms (205 lb)
Length 2.79 metres (9 ft 2 in)
Diameter 0.143 metres (5.6 in)

Warhead Blast-frag high explosive
Warhead weight 11 kilograms (24 lb)
IR proximity fuze

Engine Solid-fuel rocket motor
Wingspan 0.31 metres (1 ft 0 in)
9 kilometres (5.6 mi)
Flight ceiling 18,000 metres (59,000 ft)
Flight altitude 3,000 metres (9,800 ft) to 18,000 metres (59,000 ft)
Speed Mach 2.0
Infrared homing

The IÖR 58M was a Granzerian Infrared Air-to-Air missile that was developed in 1958, and was the second air-to-air missile to be developed in Granzery, and the first to be developed after the Second Great War, it was a highly successful design and remained in service with the Granzerian air force until the introduction of the FKHL-LR Sprintel in 1991. The missile was capable of pulling 11Gs while travelling at Mach 2.0. The missile however during its early deployment, was plagued with reliability issues, with the fuze often failing to detonate and in one instance the missile detonated as it detached from the aircraft firing it, destroying a Juhasz J-2 in 1964 during practice and killing Corporal Antal Erdős. Most of these issues were ironed out with the introduction of the IÖR 58M2 in 1967, which upgraded and retrofitted a superior fuze system to the missile.


The IÖR 58M1 was guided by a heat seeking PbS (Lead Sulfide) head with 30° field of view, while later variants included a rotating reticle which would increase the field of view to 50+°. The early infrared seekers would often malfunction in hot weather and be unable to track targets effectively, however with the IÖR 58M2 upgrade in 1967 these issues were solved by installing an upgraded version of the existing seeker head with a more sensitive infrared CdS (Cadmium Sulfide) cells rather than the insensitive PbS cells used on the IÖR 58M1.

An enlarged, radar-guided variant of the IÖR 58M called the LÖR 58M was also developed in the late 1950s, but early models were faulty and featured poor target tracking and maneuvrability, the LÖR 58M was rejected in air force service by the AIM-7 Sparrow based L 65M.


IÖR 58M1
Original 1958 model Infra-red homing missile with a PbS (Lead Sulphide) seeker head.
IÖR 58M2
A model with an upgraded field of view and a superior CdS (Cadmium Sulphuide) seeker head.
A semi-active radar homing missile that was to be used on the Juhasz J-5.