Think of a military helicopter. Think of it in combat. Is it a Black Hawk dropping off operators in urban combat? A Chinook picking troops up from a remote ridge or rooftop? Maybe you're old school and you see a Piasecki H-25 or H-19 Chickasaw from the Korean War. But few people will think all the way back to World War II when German and American helicopters all served on the front lines.
America's military helicopter program was largely carried by two companies, both prominent helicopter manufacturers today who, oddly enough, are now competing to create the Army's next generation of vertical lift aircraft. Sikorsky's founder, Igor Sikorsky, was a Russian-American immigrant who wanted to help his adopted country fight in World War II.
He received financial backing from friends to start manufacturing aircraft, predominantly fixed-wing planes, for the U.S. military. But, off to the side, he was developing new helicopter designs including the VS-500, an aircraft that used one large rotor blade to generate lift and another, smaller rotor blade mounted on a long boom to generate anti-torque. This is the same blade configuration now used on everything from the UH-60 to the AH-64 Apache.
The VS-300 prototype quickly gave way the R-4, a two-seater helicopter that would serve most predominantly with the U.S. Army but also the Navy, Coast Guard, and the Royal Air Force. It first began rolling off the production line in 1942 and was primarily used for observation and to ferry supplies.
But, the helicopter was also employed in two daring rescue missions in the challenging terrain of the China-Burma-India Theater. The helicopters could just barely make it through the high mountain passes that planes could easily fly over, but the rotary aircraft could land in small clearings that were impossible for planes to stop in or take off from.
Other helicopters were in development during the war. The Bell Aircraft Corporation, later known as Bell Helicopters and now Bell Flight, created the Bell Model 30 that would see limited use on the home front, but it would not be deployed overseas.
Meanwhile, Germany's helicopter program was much more advanced than America's or the Allies'. They debuted experimental helicopter designs before the war and even flew prototypes in front of adoring crowds for weeks in 1938.
This pre-war research led to the Fa-223, the "Dragon." Five types were planned with missions from anti-submarine, to search and rescue, to cargo carrying. But it really predicted future developments when it was used to recover crashed aircraft and to move artillery batteries to inaccessible mountaintops where they would have greater range and better defenses.
Meanwhile, the Flettner-282 Hummingbird was designed to seek out enemy submarines at sea and other threats. It was completed late in the war with early models going through testing in 1943. But the first 24 were completed in time for limited deployments to the Baltic Sea, the Mediterranean, and the Aegean Sea.
A number of other models were in experimental phases during the closing months of the war, but saw limited or no combat use before war's end. But the American, German, and other designs that didn't quite make it into the fight would prove influential for decades to come.