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Today in 1947 marked the H-4 Hercules' maiden flight. What is the H-4 better known as?

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Answer:

The Spruce Goose. At 319 ft 11 in, the Spruce Goose - which was actually made of birch wood - remains the largest aircraft ever built in terms of wingspan. It flew only once, for one mile, at an altitude of 70 feet. The Spruce Goose currently resides in the Evergreen Aviation Museum in McMinnville, Oregon. For more on the Spruce Goose's history, visit the museum website here.