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The Eurocopter EC135: Melding Form & Function

Eurocopter EC135
Gemini Sparkle

Key Takeaways:

  • The EC135 evolved from the MBB BO 108 test vehicle, becoming Eurocopter's inaugural helicopter after corporate mergers, and quickly achieved certification and industry recognition.
  • It is distinguished by its blend of form and function, incorporating advanced technologies like a fenestron tail rotor, anti-resonance isolation system, and FADEC-equipped engines, making it one of the quietest in its class.
  • The helicopter's versatility and robust design have led to its dominance in the light-twin market, with widespread adoption for diverse missions including emergency medical services (EMS), police, and corporate transport globally.
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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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