Flight Journal

ENGINE SUPERCHARGING

used in fighters in the late ’20s had induction air flowing directly from a duct in the nose of the aircraft into the carburetor. When an aircraft gained altitude, the thinner air was insufficient to maintain the sea-level-rated horsepower of these engines, so performance decreased as the altitude increased. The aircraft had a service ceiling of 14,000 to 18,000 feet (depending on the air density), and level-flight high speeds decreased proportionally with altitude.

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