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The Martin KF-1 was an American biplane fighter aircraft designed and built by Captain James V. Martin .
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1-489: The KF-1 started as a proposed "high-altitude fighter" designated the K.III . Powered by an ABC Gnat the K-3 first flew in May 1918, and was delivered to McCook Field the next month. The model was not ordered for production. In 1921 Martin submitted an improved version with a larger engine and wider wings. The Navy ordered three, designated K-IV , then later KF-1 . The version featured