The Curtiss PN-1 was an American single-seat night fighter biplane built by Curtiss Aeroplane and Motor Company using blueprints from the Engineering Division of the United States Army Air Service.
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In 1920 10 more L-6 engines were ordered, designated L-825, several of which were installed in the Curtiss PN-1, (only two built), and the Engineering Division TW-1, (only six built).