High Quality Content by WIKIPEDIA articles! The Bell 407 is a four-blade, single-engine, civil utility helicopter; a derivative of the Bell 206L-4 LongRanger. The 407 uses the four-blade rotor with composite hub developed for the United States Army`s OH-58D Kiowa Warrior instead of the two-blade, semi-rigid rotor of the 206L-4. The Bell 407 is frequently used for corporate and offshore transport, as an air ambulance, law enforcement, electronic news gathering and movie making.