Jisho

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かへんよく 可変翼
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Noun
1. variable wing (of an aircraft)​
Wikipedia definition
2. Variable-sweep wing​A variable-sweep wing, colloquially known as a "swing wing", is an aeroplane wing that may be swept back and then returned to its original position during flight. It allows the aircraft's planform to be modified in flight, and is therefore an example of a variable-geometry aircraft. Typically, a swept wing is more suitable for high speeds, while an unswept wing is suitable for lower speeds, allowing the aircraft to carry more fuel and/or payload, as well as improving field performance.
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