The Sikorsky-Boeing SB-1 Defiant was a revolutionary coaxial rotor helicopter designed to replace the legendary Black Hawk in the U.S. Army’s Future Vertical Lift program. Featuring twin counter ...

Used primarily for medevac missions during the Korean War, the Sikorsky HO5S-1 was also an observation platform, artillery spotter and troop transport. Dane Penland It began life as a two-place ...