Most modern of the Bell 204/UH-l Huey series; see additional side-view silhouettes for details. The 412 shows a four-bladed main rotor and well-streamlined engine housings.

The 212/412 series started with the old model 204 UH-1 Huey, which grew into the longer, slimmer model 205 UH-1 Iroquois. The big change to 212 added twin engines for redundant reliability and increased performance. The 412's four-bladed rotor increased performance and decreased fuselage vibration. Versions are manufactured in several countries. Armed Hueys and Iroquois are rare now; many have been upgraded and converted for military medical evacuation and light transport.