Spruce Goose Single Flight: Facts Explained

The Spruce Goose made exactly one flight, on November 2, 1947, piloted by Howard Hughes. It flew for about 26 seconds, covering roughly one mile at an altitude of about 70 feet before landing back on the water. That single hop was the only time the massive wooden flying boat ever left the ground.

Formula

The average speed of the flight is calculated as distance divided by time:

• Average speed (km/h) = (distance in meters ÷ 1000) ÷ (time in seconds ÷ 3600)
• Average speed (m/s) = distance in meters ÷ time in seconds

Variables: d = distance traveled (meters), t = flight duration (seconds). The calculator converts to kilometers per hour and meters per second.

Worked Example

Using the default values from the calculator: flight time = 26 seconds, distance = 1609 meters (about 1 mile).

1. Convert distance to kilometers: 1609 ÷ 1000 = 1.609 km
2. Convert time to hours: 26 ÷ 3600 = 0.007222 hours
3. Average speed in km/h: 1.609 ÷ 0.007222 = 222.8 km/h
4. Average speed in m/s: 1609 ÷ 26 = 61.88 m/s

The calculator shows an average speed of 222.80 km/h (61.88 m/s) for that 26-second hop.

Background: Why Was It Built?

The Spruce Goose, officially the Hughes H-4 Hercules, was designed during World War II to transport troops and supplies across the Atlantic, where German submarines made ship travel dangerous. The U.S. government contracted Howard Hughes to build a flying boat that could carry 750 passengers or a full army division. Because wartime restrictions limited the use of strategic metals like aluminum, the aircraft was built almost entirely from birch wood (not spruce, despite the nickname). The plane had the largest wingspan of any aircraft at the time—320 feet, 11 inches—and was powered by eight Pratt & Whitney R-4360 Wasp Major engines, each producing 3,000 horsepower.

The 1947 Flight: What Actually Happened

After years of development and delays, the H-4 was completed in 1946, but critics doubted it could ever fly. On November 2, 1947, during a taxi test in Long Beach Harbor, Hughes decided to take the aircraft into the air. With Hughes at the controls and two crew members aboard (plus a few guests), the Spruce Goose lifted off the water, flew for about 26 seconds, and then landed smoothly. Some witnesses reported the flight covered about one mile; others estimated less. Hughes later said he was simply testing the aircraft’s handling and never intended a full flight. The plane never flew again.

Why Did It Only Fly Once?

Several factors combined to keep the Spruce Goose grounded after that single flight:

• End of wartime need: The war ended in 1945, so the original military purpose disappeared.
• Funding cuts: Congress canceled further government funding, and Hughes spent his own money to finish and test the aircraft.
• Technical challenges: The wooden construction, while innovative, was difficult to maintain and the plane was extremely heavy (about 400,000 pounds empty).
• Lack of commercial interest: No airline or military branch wanted to operate such a large, unconventional aircraft.
• Hughes’s focus shifted: After the flight, Hughes turned his attention to other projects, and the plane was stored in a climate-controlled hangar until his death in 1976.

Common Misconceptions

One common misconception is that the Spruce Goose was made of spruce. In fact, it was built mostly from birch wood, with some spruce and other woods. Another myth is that the plane flew for hours or reached great altitudes; the actual flight lasted less than half a minute and stayed low over the water. Some also believe the plane was a failure, but it was a successful proof of concept for a massive wooden aircraft—it just had no practical role after the war.

What Happened to the Spruce Goose Afterward?

After Hughes died in 1976, the Spruce Goose was moved to a display site in Long Beach, California, where it was shown to the public for years. Later, it was transferred to the Evergreen Aviation & Space Museum in McMinnville, Oregon, where it remains on display today. The aircraft is a popular tourist attraction and a reminder of one of aviation’s most ambitious experiments.

Frequently Asked Questions

Did the Spruce Goose ever fly again after 1947?
No. The November 2, 1947 flight was its only flight. After that, it was stored and never took to the air again.

Why is it called the Spruce Goose if it’s made of birch?
The nickname was coined by critics as a derogatory term, playing on the idea that the plane was made of wood. The actual construction used birch, but the name stuck.

How fast did the Spruce Goose fly on its only flight?
Based on the commonly cited distance of about one mile in 26 seconds, the average speed was roughly 222 km/h (138 mph). Some estimates vary, but that’s the figure derived from the standard numbers.

Could the Spruce Goose have flown higher or longer if Hughes had tried?
Possibly, but Hughes never attempted a full flight. The aircraft was designed for long-range transport, but without a mission, further testing was abandoned.

Is the Spruce Goose the largest wooden airplane ever built?
Yes, it holds the record for the largest wingspan of any aircraft ever flown, and it is the largest wooden aircraft ever constructed.

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in t | Flight time | sec | 26 | 0
in d | Distance | m | 1609 | 0
out speed | Average speed | km/h | (d / 1000) / (t / 3600) | 2
out speed_ms | Average speed | m/s | d / t | 2