Naval Aircraft Factory TF - Development

Development

Following the armistice, the incentives to produce a fighter eventually deviated toward evaluating the prospective applications of a highly unique concept. Upon review of numerous proposals, the Aeronautics Division of the U.S. Bureau of Engineering referred recommendations to the Chief of Naval Operations in which to finalize approval of a submission by the Naval Aircraft Factory (NAF) with which to produce a pre-production series of four prototypes at an estimated construction cost of $84,680.

Accordingly, the NAF proposal consisted of a twin-engine flying boat which featured a hull design identical to that of the Curtiss NC-1, an armament of four flexible mounting Lewis machine guns, and four crew members. An egg-like nacelle atop the upper wing housed an additional pilot/gunner's position. Initially designated as Twin Fighter (TF), a review of the aircraft's dimensions showed that the wingspan was insufficient for a conventional two-engine layout. Thus, the Bureau of Engineering revised the engine configuration into a tractor/pusher combination mounted on the aircraft centerline. This change altered the designation from Twin to Tandem fighter. The TF was designed to incorporate two Curtiss-built 400 hp (300 kW) Kirkham inline engines, however mechanical problems hindered the development of these power plants, so two 300 hp (220 kW) Hispano Suiza engines were adopted instead.