The Royal Aircraft Factory 1a was a British biplane fighter aircraft developed during World War I. Designed by the Royal Aircraft Factory, it was intended to provide the Royal Flying Corps with a capable and versatile aircraft for air combat. The 1a featured a distinctive pusher configuration, where the engine was mounted behind the pilot, allowing for better visibility and reducing the risk of engine damage during combat. First flown in 1916, the 1a was powered by a Gnome rotary engine and had a top speed of around 100 mph. Although it had some innovative features, it was eventually overshadowed by more advanced designs and did not see widespread service.