I believe it is: The Bonney Gull
The Bonney Gull was an experimental aircraft that used variable incidence wings with bird-like shapes. Leonard Warden Bonney was an early aviator, who flew with the Wright Exhibition Team as early as 1910. An experienced aviator with service in the First World War, Bonney set out to develop a plane with more efficient wings and controls than contemporary aircraft. Noting the gull's two to one lift to weight ratio, he set about molding gull wings for their shape. Construction took place over the course of five years. The ideas were tested in MIT and the Daniel Guggenheim School of Aeronautics wind tunnels.
Bonney was unable to find a willing test pilot and chose to fly the aircraft himself. He performed a test hop, damaging the landing gear once. On 4 May 1928 Bonney took up another aircraft on a flight, then announced he would test fly the Gull that day. Bonney was killed during the maiden flight when the aircraft nosedived into the ground from about 50 feet of altitude, seconds after taking off from Curtiss Field on Long Island. Pathé News was onsite to film the first flight. The newsreel shows the aircraft experiencing a roll to the left which was corrected, and a single oscillation in pitch before nosing straight down into the ground tossing out Bonney. Bonney was taken to Mineola Hospital where he died.