Two Sikorsky YR-4B Helicopters in Flight ジグソーパズル

Step into the early era of helicopter flight with this puzzle featuring two Sikorsky YR-4B helicopters in flight, circa 1944. The YR-4B was a pre-production variant of the world’s first mass-produced helicopter, the Sikorsky R-4, which revolutionized aviation with its ability to take off and land vertically. These pioneering aircraft were used during World War II for reconnaissance, rescue, and training missions, proving the potential of rotorcraft in modern warfare. Perfect for aviation enthusiasts, helicopter collectors, military history fans, and puzzle lovers, this design highlights a groundbreaking moment in the evolution of vertical flight. Assemble a piece of history that captures the birth of military helicopter aviation.