On November 2, 1947, thousands of people gathered near the port of Long Beach, California, without knowing that they were going to witness something that was not in their plans. In front of them, a huge plane built almost entirely made of wood He was preparing to move on the water. It was larger than any aircraft that had existed until then. Its creator, businessman and filmmaker Howard Hughes, decided to take charge. That day, for a few brief seconds, the H-4 Hercules—popularized as “Spruce Goose”—managed to take off and demonstrate that it could fly.
Five years before that unexpected flight, the world was at war and German submarines were sinking hundreds of Allied ships in the Atlantic. The United States needed a safe way to transport troops and supplies without relying on sea routes, and magnate Henry Kaiser thought he had the answer: a gigantic transport plane capable of crossing the ocean. Since he had no experience in aviation, he went to Hughes, who accepted the challenge of building it under a condition that would complicate everything: the government prohibited the use of strategic materials such as aluminum or steel.
When aluminum was lacking and ambition was left over: the birth of the H-4 Hercules
The agreement between Kaiser and Hughes was signed in 1942, in the middle of the war, with the idea of manufacturing three units of the new aircraft. They called it HK-1, after the initials of their last names. However, the initial enthusiasm soon collided with reality: the size of the device, the complexity of the design and material limitations caused the project to be delayed more than expected. Kaiser, accustomed to meeting deadlines in the naval industry, grew impatient and abandoned the program in 1944. Hughes decided to go ahead alone and renamed the aircraft the H-4 Hercules.
Deprived of metals such as aluminum, Hughes turned to an unusual material in aviation: wood. But not just any wood. He opted for an innovative system called Duramold, which consisted of laminating thin layers of birch and gluing them with synthetic resins to form a structure that was as rigid as it was light. This process, developed a few years before, allowed the parts to be molded with great precision and reduced the total weight of the fuselage. The result was a gray and smooth surface that, at first glance, barely allowed one to guess that this colossus was made of wood.
The result of Hughes’ experiments was a monumental flying boat. The H-4 Hercules had a tall wing that extended almost 98 meters from tip to tip and eight enormous 28-cylinder Pratt & Whitney engines, capable of propelling the craft with surprising smoothness. Two floats were installed on the outside of the wings to give it balance when sailing. The entire fuselage was built with the Duramold methodwhich provided a smooth surface, without rivets. It was a strange combination of strength, elegance and enormous size.
The H-4 Hercules measured almost 66 meters long and more than 79 meters in wingspan, figures that made it the largest aircraft ever built at its time. Its height, more than 24 meters, was equivalent to an eight-story building. Empty, it weighed about 136 tons, and fully loaded it could reach 180. With a cruising speed of about 240 kilometers per hour, it was designed to transport up to 400 soldiers or the equivalent in war material. Despite its size, Hughes was confident that the design would allow it to take off smoothly from the water.
The morning of November 2, 1947 dawned calm in Long Beach. The H-4 Hercules was to carry out simple displacement tests, with Hughes at the controls and a small group of technicians and journalists on board. What happened next was not on the flight plan. Halfway through the trip, the pilot increased the power and the seaplane, of more than 130 tonsrose a few meters above the water. It remained in the air for half a minute and traveled about 800 meters before descending gently. It was his first and last flight.
The H-4 Hercules cost about 23 million dollars at the time, the equivalent of more than 278 million today. Its development had spread so far that, by the time it flew, the war had ended two years earlier. Many considered it a waste of public money and the press dubbed it “Spruce Goose,” a label Hughes detested. For years he defended his project against critics and kept the aircraft in perfect condition, with a full-time team in charge of keeping it ready to fly.
For more than three decades, the H-4 Hercules remained hidden in a climate-controlled hangar under the direct supervision of Howard Hughes. After his death in 1976, his company, Summa Corporation, donated the plane to the Aero Club of Southern California. In 1983, heThe aircraft was again shown to the public: The Wrather company moved it to a huge dome-shaped hangar next to the Queen Mary ship, also in Long Beach. For the first time since 1947, the “Spruce Goose” was again seen by thousands of curious visitors.
In 1992, the Oregon-based Evergreen Aviation & Space Museum submitted the winning proposal to give the H-4 Hercules a new permanent home. The plane was disassembled piece by piece and transported by barge from Long Beach to Portland, following the Pacific coast and then the Columbia and Willamette rivers. After several months of waiting for the water level, in February 1993 the sections arrived in McMinnville, where temporary hangars were erected to begin restoration. In 2001, the “Spruce Goose” was again shown to the public, fully assembled.
More than seven decades after its only flight, the H-4 Hercules remains a benchmark in aeronautical engineering. To this day it maintains three historical titles: it is the largest seaplane, the largest wooden plane and the largest propeller plane ever built. Its technical influence can be seen in numerous subsequent developments, and its history continues to inspire engineers and enthusiasts. What was born as an experiment forced by scarcity ended up becoming a symbol of ambition and perseverance.
Imágenes | SDASM Archives | Air and Space Museum (1, 2, 3) | Steven Fine |
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