The Bell L-39 was an experimental aircraft used to test the characteristics of swept wings. == Design and development == After the end of World War II, the United States military took interest in German aerodynamic research into swept wings.
The Bell L-39 was an experimental aircraft used to test the characteristics of swept wings. == Design and development == After the end of World War II, the United States military took interest in German aerodynamic research into swept wings.
Source: Wikipedia "Bell L-39" · CC BY-SA 4.0
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