BO-105 Air Medical EvacuationBO 105 helicopter model. The Messerschmitt Blkow Blohm Bo 105 is a light, twin engine, multi purpose helicopter developed by Blkow of Ottobrunn, West Germany. It was the first light twin engine helicopter in the world, and the first rotorcraft that could perform aerobatic maneuvers such as inverted loops. The Bo 105 features a revolutionary hingeless rotor system, at that time a pioneering innovation in helicopters when it was introduced into service