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The Kerrison predictor did not calculate fuse settings, as the shells fired by the 40 mm Bofors gun, with which it was designed to work, were contact-fused. [4] The Predictor proved to be able to hit practically anything that flew in a straight line, and it was particularly effective against dive bombers.
Dalton's first popular computer was his 1933 Model B, the circular slide rule with true airspeed (TAS) and altitude corrections pilots know so well. In 1936 he put a double-drift diagram on its reverse to create what the U.S. Army Air Corps (USAAC) designated as the E-1, E-1A and E-1B.
This initial estimate was entered along with the measured location of the target. The calculator continually outputs the predicted position of the target based on the estimated motion from this initial location. If the initial speed estimate is inaccurate, the target will drift away from the predicted location over time.
Some drift meters were purely optical (e.g., USAAF Type B-5 drift meter), while others included electrically powered gyroscope (e.g., USAAF Type B-3 drift meter). [2] USAAF Type B-5 drift meter was also equipped with a simple flight computer (a rotating wheel) to calculate the ground speed from the measured time that takes for a ground object ...
Example of a ballistic table for a given 7.62×51mm NATO load. Bullet drop and wind drift are shown both in mrad and MOA.. A ballistic table or ballistic chart, also known as the data of previous engagements (DOPE) chart, is a reference data chart used in long-range shooting to predict the trajectory of a projectile and compensate for physical effects of gravity and wind drift, in order to ...
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IX examples, was the auxiliary drift bar. This was attached at the front of the main drift bar and consisted of a single drift wire mounted on a rotating fixture. [33] This allowed relative measurements of the drift relative to the aircraft without having to rotate the main drift bar and thereby possibly leave the sight in an incorrect setting ...