On This Day
1929 – Jimmy Doolittle performs the first flight without a window, proving that full instrument flying from take off to landing is possible.
Doolittle’s most important contribution to aeronautical technology was the development of instrument flying. He was the first to recognize that true operational freedom in the air could not be achieved unless pilots developed the ability to control and navigate aircraft in flight, from takeoff run to landing rollout, regardless of the range of vision from the cockpit. Doolittle was the first to envision that a pilot could be trained to use instruments to fly through fog, clouds, precipitation of all forms, darkness, or any other impediment to visibility; and in spite of the pilot’s own possibly convoluted motion sense inputs. Even at this early stage, the ability to control aircraft was getting beyond the motion sense capability of the pilot. That is, as aircraft became faster and more maneuverable, pilots could become seriously disoriented without visual cues from outside the cockpit, because aircraft could move in ways that pilots’ senses could not accurately decipher.
Doolittle was also the first to recognize these psycho-physiological limitations of the human senses (particularly the motion sense inputs, i.e., up, down, left, right). He initiated the study of the subtle interrelationships between the psychological effects of visual cues and motion senses. His research resulted in programs that trained pilots to read and understand navigational instruments. A pilot learned to “trust his instruments,” not his senses, as visual cues and his motion sense inputs (what he sensed and “felt”) could be incorrect or unreliable.
In 1929, he became the first pilot to take off, fly and land an airplane using instruments alone, without a view outside the cockpit. Having returned to Mitchel Field that September, he assisted in the development of fog flying equipment. He helped develop, and was then the first to test, the now universally used artificial horizon and directional gyroscope. He attracted wide newspaper attention with this feat of “blind” flying and later received the Harmon Trophy for conducting the experiments. These accomplishments made all-weather airline operations practical.
Born On This Day
1898 – Charlotte Moore Sitterly, American astronomer (d. 1990)
Charlotte Emma Moore Sitterly (September 24, 1898 – March 3, 1990) was an American astronomer. She is known for her extensive spectroscopic studies of the Sun and chemical elements. Her tables of data are known for their reliability and still used regularly.
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