H-54 Tarhe

The insect-like Tarhe was a heavy-lift helicopter found in U.S. Army service until around 1990. Retired from military use, Tahre's civil variant, the S-64 Skycrane, was still employed for commercial use.

The skeletal configuration of the Tarhe was highly distinctive, featuring "outrigger" landing gear and a long tailboom/engine mount spine instead of the more usual semi-monocoque fuselage. The six-blade, fully articulated rotor had aluminum blades. Two Pratt & Whitney turboshaft...