Rocketsan and Lockheed Martin extend SOM-J partnership

IHS Janes

15 July 2016

Rocketsan has signed a contract with Lockheed Martin Missiles and Fire Control (MFC) at Farnborough International Airshow 2016 to continue the development of its Stand-Off Missile (SOM) for internal carriage on the F-35.

Under the terms of the contract Lockheed Martin MFC continue its work with Rocketsan on the SOM-J variant, while also marketing the weapon to F-35 customers. Development of the SOM-J began in 2014 with Rocketsan being awarded a contract by the Turkish Undersecretariat for Defence Industries (SSM) to develop a variant of its cruise missile that could fit inside the F-35 weapons bay. The SOM-J features a redesigned narrow airframe and the repositioning of the air intake from the underside of the weapon to the left hand side.

Original post


SOM Air-to-Surface Cruise Missile

SOM Missile

Stand-Off Missile (SOM) is Turkey’s first indigenous long-range, autonomous, high-precision air-to-surface cruise missile. It was designed and developed jointly by TUBITAK Defense Industries Research and Development Institute (TUBITAK SAGE) and Roketsan to defend ground- and sea-based targets.

The missile is highly effective against moving land / surface targets, high-value stationary targets, strategic assets, shelters, exposed aircraft, aircraft hangars, and command and control centres, as well as sea surface threats. It has resistance against countermeasures as well as clutter effects.

In October 2014, Roketsan and Lockheed Martin Missiles and Fire Control signed a teaming agreement on the development of a new generation stand-off cruise missile variant, SOM-J for internal carriage on the F-35 Lightning II fifth generation multi-role stealth fighter or external carriage on other aircraft.

Design and features of SOM cruise missile

The SOM cruise missile features a modular design, offers high-lethality and delivers enhanced operational flexibility. It has a low detectable capability and a longer range compared to surface-to-air missiles. It is compatible with the Nato UAI standard.

The missile is capable of performing in-flight re-targeting as well as in-flight mission selection among pre-planned missions. Its rear section is fitted with control fins for providing lifting and improved manoeuvrability.

Suspension lugs fitted to the missile provide mechanical interface between the missile and the launch aircraft. The weapon system also incorporates a power system, fuel tank, air inlet, wing deployment system, and a missile computer.

The missile system weighs 600kg and is equipped with a 230kg blast fragmentation and dual stage tandem penetration warhead. It features selectable impact parameters.


Guidance and navigation

SOM is equipped with an imaging infrared (IIR) seeker and an inertial measurement unit (IMU) for high-precision guidance. The IIR seeker incorporates a high-resolution imaging system and allows detection of predefined targets with long ranges, high-agility, and resistance to electronic countermeasures / clutter.

The cruise missile is navigated using global positioning system (GPS), inertial navigation system (INS), terrain referenced navigation (TRN), image-based navigation (IBN), and automatic target recognition (ATR) sensors. It also incorporates a radar and barometric altimeter for determining the flight altitude, and has the ability to follow waypoints and terrain contours.


TUBITAK-SAGE developed the missile in three variants with varying warheads and guidance/communication packages:

  • SOM A: Basic Air Force variant that is designed to engage a military target in simple strike mode by using the coordinates of the given target at the terminal stage.
  • SOM B1: Advanced Air Force variant that engages a military target in precision strike mode using imaging infrared matching at the terminal stage.
  • SOM B2: Special Air Force variant featuring a dual-stage penetrator warhead which is designed to engage strategic and well-protected assets in precision strike mode.


  • SOM J: A joint-venture between Lockheed Martin of the United States (Teaming Partner) designed specifically for use in the internal carriage bay of the F-35 JSF. It is more compact with folding control surfaces and a booster (rocketry).
SOM B1, B2 and J variants feature a data-link for man-in-the-loop update of a waypoint and terminal stage of the missile.


Propulsion and performance of SOM missile

Microturbo TRI 40



TRI 40 – The newest addition to the company Microturbo engine family. Small size and high thrust-to-weight ratio makes the TRI 40 promising drive unit for advanced anti-ship missile, target practice and drones. The motor has a four-stage compressor and a single stage turbine, works to fuel JP8 and JP10. Stroke engine according to the version in the range from 250 to 340 kg. Optimal conditions for the operation of the engine are set at flight altitude 0 to 6000 m and a maximum speed of M = 0.95.Starting can be at a rate of M = 0.5 and M = 0.9 to a height of 5300 meters. The first “flying”, with the engine TRI is 40 anti-ship missile NSM company Kongsberg Defense & Aerospace and MBAD. Source

The Stand-Off missile is powered by a turbojet engine and has a range of more than 180km. It is operable under all weather conditions, and also in hostile environments.

Details of the SOM-J variant


The advanced SOM-J variant will be jointly developed, produced, marketed, and sold by Lockheed Martin and Roketsan. The first stage of SOM-J is scheduled for completion in 2018.

The variant is intended to provide exceptional anti-surface warfare capabilities to the F-35 Lightning II Joint Strike Fighter and other similar aircraft.

Main material source

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