The EC-135 is expected as a swap for Eurocopter's fruitful BO-105 light twin, and is produced from the BO-108 engineering demonstrator.
The first MBB BO-108 was expected as a high engineering helicopter demonstrator, and as being what is indicated consolidated a scope of high innovation gimmicks including a hingeless primary rotor (Sikorsky and Boeing embraced this outline for their military RAH-66 Comanche), all composite bearingless tail rotor, shallow transmission (permitting more prominent lodge stature) with uncommon vibration absorbers, composite structures, enhanced flight science, advanced flying and EFIS instrumentation. The main BO-108 was fueled by Allison 250-C20r3 turboshafts and flew on October 15 1988.
The achievement of the BO-108 test system prompted MBB's report in January 1991 that it would create a creation 108 with Arrius or PW-206 motors as a swap for the BO-105, with confirmation anticipated 1994 and conveyances in 1995. However the development of Eurocopter (in January 1992) gave the system access to Aerospatiale's Fenestron covered tail rotor innovation which was then fused into the outline.
The synthesis of the BO-108 and the Fenestron prompted the conclusive EC-135 flying surprisingly on February 15 1994. German accreditation was conceded on June 14 1996, while US regard was given on July 31 that year, that day as the first client conveyance.
The PW-206 controlled model is assigned EC-135p-1, the EC-135t-1 has the Arrius 2b1.
The assignment for committed military renditions is EC-635.
Pictures of Eurocopter EC-135/635