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The Eurocopter EC135: Melding Form & Function

Eurocopter EC135
Gemini Sparkle

Key Takeaways:

  • The EC135 originated as MBB's BO 108 flight test vehicle in the 1980s, evolving through corporate mergers to become Eurocopter's first successful light-twin helicopter, introduced in 1995.
  • Its design effectively melds form and function, allowing it to dominate the emergency medical service, police, and corporate markets due to its versatility, continuous engine upgrades, quiet operation, and smooth ride.
  • The helicopter achieved rapid global adoption, with over 300 units delivered to more than 100 customers in 28 countries by early 2004, supported by expanded production and maintenance facilities to meet high demand.
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When a manufacturer can successfully meld form and function in a product’s design the results are invariably aesthetically and economically satisfying. In the mid-1980s, when MBB (Messerschmitt-Bolkow-Blohm) began development of its BO 108, it had no idea how successfully the helicopter’s form would let it perform many missions. Initially, the BO 108 was intended as a flight test vehicle to investigate advanced systems. The flight test regime was designed to explore the technical and economic potential of advanced rotor technology, anti-resonance isolation systems, composite structures, cockpit installations and engine integration. Initially, the BO 108 was powered by a pair of Allison 250 C20-R engines.

A second BO 108, this one powered by a pair of Turbomeca TM319-1B Arrius engines, was introduced in 1991. At the time, the design featured a conventional tail rotor, but the BO 108 was soon fitted with a fenestron (a shrouded tail rotor) that had become a popular design feature on Aerospatiale’s helicopters. The merging of MBB and Aerospatiale technology in the BO 108 was a result of major corporate shuffling that occurred when Germany’s Daimler Chrysler Aerospace, which had acquired MBB, merged with Aerospatiale-Marta of France in 1992 to become Eurocopter, which in turn was a wholly owned subsidiary of EADS, the second largest aerospace and defense company in the world.

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