Modern aircraft do not have a bombsight but use highly computerized systems that combine bombing, gunnery, missile fire and navigation into a single head-up display. When postwar studies demonstrated that bomb accuracy was roughly equal either optically or radar-guided, optical bombsights were generally removed and the role passed to dedicated radar bombsights.įinally, especially since the 1960s, fully computerized bombsights were introduced, which combined the bombing with long-range navigation and mapping. Then, in World War II, tachometric bombsights were often combined with radar systems to allow accurate bombing through clouds or at night. In the 1930s, mechanical computers with the performance needed to "solve" the equations of motion started to be incorporated into the new tachometric bombsights, the most famous of which is the Norden. Vector bombsights were useful for altitudes up to about 3,000 m and speeds up to about 300 km/h. These early systems were replaced by the vector bombsights, which added the ability to measure and adjust for winds. They were replaced by the earliest custom-designed systems, normally iron sights that could be set based on the aircraft's airspeed and altitude.
#Norden bomb sites series
In some cases, they consisted of nothing more than a series of nails hammered into a convenient spar, lines drawn on the aircraft, or visual alignments of certain parts of the structure. The earliest systems were iron sights, which were pre-set to an estimated fall angle. That has led to a series of increasingly sophisticated bombsight designs, dedicated to high-altitude level bombing.īombsights were first used before World War I and have since gone through several major revisions. However, low-level bombing also increases the danger to the bomber from ground-based defences, and accurate bombing from higher altitudes has always been desired. Those effects are combined in the dive bomber. Those effects can be minimized by reducing the fall time by low-level bombing or by increasing the speed of the bombs. There are additional factors such as changes in air density and wind that may be considered, but they are concerns only for bombs that spend a significant portion of a minute falling through the air. The two primary forces during its fall are gravity and air drag, which make the path of the bomb through the air roughly parabolic. Bombsights, a feature of combat aircraft since World War I, were first found on purpose-designed bomber aircraft and then moved to fighter-bombers and modern tactical aircraft as those aircraft took up the brunt of the bombing role.Ī bombsight has to estimate the path the bomb will take after release from the aircraft. A bombsight is a device used by military aircraft to drop bombs accurately.