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SEP (Splitterskyddad EnhetsPlattform) THOR / Alligator

Swedens SEP (Splitterskyddad Enhets Plattform - Splitter Protected System Platform,) THOR/ Alligator was an innovative land vehicle design, with wheeled or rubber band-track versions offering strong commonality benefits. A "splitter" is a worker who splits fish and removes the backbone. That is not to say that the wheeled and tracked platforms are interchangeble [a al Christey], but rather than common hull, power-pack and other systems are common.

The vehicle was developed by BAE Systems Hagglunds to meet requirement of the Swedish Army. Studies on the SEP began in 1994. Prototypes were produced in 2000 (caterpillars) and 2003 (6 6). The original requirement of Sweden was 600 vehicles in 10 variants, but later the Ministry of Defence of Sweden announced that due to budget cuts, would not invest in the next generation SEP. The Ministry of Defence also decided not to join the FRES program (Future Rapid Effects System). Despite this the SEP program continued, and the Ministry of Defence of Sweden defended the decrease to 200-300 units and the contract for its production must be signed in 2009 and the first delivery was scheduled for 2011.

The 8 8 SEP vehicle is designed for 40 modifications. All versions of SEP are 6.1 m long and 2.8 m wide. It can be equipped with special modules for missions. This feature provides flexibility and makes it easily adapted vehicle for various missions and reduces lifecycle costs. The SEP, due to its versatility, allows to replace a wide range of armored vehicles. The armored vehicle SEP is available with various weapons. Users can receive the installation of controlled weapons stations remotely by an operator such as machine guns 7.62 mm or 12.7 mm (.50), 40mm grenade launchers. You have the option of towers for weapons ranging from 25mm and 120mm. The vehicle can also carry mortar 81mm or 120mm. The SEP provides high level of protection, and can receive protection against heavy machine guns and extra protection against incndioalm estilhaoes artillery and land mines. During a live demonstration, two RPG-7 were fired, but no serious damage was due to provacado installed reactive protection. It is noteworthy that the SEP has advanced features such as stealth technology and is equipped with automatic fire even series extinguishing system, however CBrN protection system is offered as an option. The vehicle is equipped with two diesel engines, developing 270 hp each. The SEP 8 8 armored troop transport, has hydropneumatic suspension. The vehicle also has electric battery option where it can be operated in silent mode without the aid of the diesel engine, the station can be installed to inflate the tire in case of puncture. The electric transmission system (the drive shafts have been replaced by cable and the power from the engines is transferred by cable) gives a number of advantages, including volume efficiency, fuel efficiency, reduced life cycle costs, reduced environmental impact and increased stealth characteristics.

The engine is decoupled from the final drives allowing flexibility in the placing of systems in the vehicle and also easily allows two engines to be installed instead of one. Batteries are integrated into the electric drive system, which allow the vehicle to be driven silently for several hours with the engines shut down.

The work started with a background study and was followed by a phase of concept development. A range of concepts for driveline layouts were compiled. The work focused on placement of electrical motors, gears and power electronics. The concepts were evaluated from a worked-out model and three of the concepts were chosen for further development. These concepts had their gears dimensioned and their shifting mechanisms designed. The result of the study showed that two of the concepts satisfied the requirements and were nominated for additional work, but their estimated development time differs. The two concepts have great potential to be used in more vehicles than SEP.

The tracked vehicles are fitted with rubber bandtracks rather than conventional steel link tracks. The bandtracks are lighter, quieter and have a longer operational life. They also have a lower rolling resistance. The top speeds for the wheeled and tracked variants are 100km/h and 85km/h respectively. The SEP combat weight is 13.5 tonnes and the load capacity is up to 6 tonnes and is thus readily transportable by air. The SEP 8 8 is airborne by C-130 Hercules, however its reactive armor needs to be removed.

After 14 years of development and 950 million invested, in January 2008 the Armed Forces scrapped plans for a Swedish developed combat vehicles that would be developed with Hgglunds in rnskldsvik. The reason is that there was no longer an international partner and that the Swedish Armed Forces lacked the financial ability to continue this on its own, says Rear Admiral Leif Nylander, Head of the Armed Forces' material production. Until 2007, the UK had planned to acquire more than 3,000 vehicles and it would have been something to support themselves. Four prototypes were supplied by Hgglunds, owned by the British group BAE Systems, to the Armed Forces. But after the British Armed Forces withdrew from cooperation and no other country has shown interest to participate in the project and share the development costs, remains for Sweden to do what politicians and investigators proposed a long time ago: to "buy off the shelf", ie, procure existing systems on the market.

The Swedish forces needed about 600 new light armored combat vehicles. According to plans in 2008, the first would put into operation in 2017, and the Armed Forces expect to find a substitute for SEP on the international market.



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Page last modified: 07-08-2016 17:46:55 ZULU