The Curtiss Twin JN (retrospectively called Model 1B, also known as JN-5) was an American experimental biplane observation aircraft built by Curtiss for the United States Army Air Service. Based on the successful JN-4, the Twin JN used the same wing structure with an extended span, by enlarging the center section. Control was achieved with the tail of a Curtiss R-4. For power, it employed a pair of 90 hp (67 kW) Curtiss OXX-2s, between the wings. One aircraft was evaluated by the United States Navy as a twin-float seaplane.
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