Whipped Cream Difficulties

If you’re a big WWII buff (especially the kind of WWII buff that watches “12 O’Clock High”) you’ve probably heard of, or heard talk about, the Norden bombsight.

It was an early tachometric design that directly measured the aircraft’s ground speed and direction, which older bombsights could only estimate with lengthy manual procedures. The Norden further improved on older designs by using an analog computer that continuously recalculated the bomb’s impact point based on changing flight conditions, and an autopilot that reacted quickly and accurately to changes in the wind or other effects.
Together, these features promised unprecedented accuracy for daytime bombing from high altitudes. During prewar testing the Norden demonstrated a circular error probable (CEP)[a] of 75 feet (23 m)[b], an astonishing performance for that period. This precision would enable direct attacks on ships, factories, and other point targets. Both the Navy and the USAAF saw it as a means to conduct successful high-altitude bombing. For example, an invasion fleet could be destroyed long before it could reach U.S. shores.
To protect these advantages, the Norden was granted the utmost secrecy well into the war, and was part of a production effort on a similar scale as the Manhattan Project. Carl L. Norden, Inc. ranked 46th among United States corporations in the value of World War II military production contracts. The Norden was not as secret as believed; both the British SABS and German Lotfernrohr 7 worked on similar principles, and details of the Norden had been passed to Germany even before the war started.

In practice, it wasn’t quite that accurate: Wikipedia gives a combat CEP of 1,200 feet.

Faced with these poor results, Curtis LeMay started a series of reforms in an effort to address the problems. In particular, he introduced the “combat box” formation in order to provide maximum defensive firepower by densely packing the bombers. As part of this change, he identified the best bombardiers in his command and assigned them to the lead bomber of each box. Instead of every bomber in the box using their Norden individually, the lead bombardiers were the only ones actively using the Norden, and the rest of the box followed in formation and then dropped their bombs when they saw the lead’s leaving his aircraft.[40] Although this spread the bombs over the area of the combat box, this could still improve accuracy over individual efforts. It also helped stop a problem where various aircraft, all slaved to their autopilots on the same target, would drift into each other. These changes did improve accuracy, which suggests that much of the problem is attributable to the bombardier. However, precision attacks still proved difficult or impossible.

I wonder, if you had told WWII bombardiers at the time that the detailed workings of the Norden bombsight would be available to anyone in the world 73 years later, what would they have thought? Maybe nothing. Who knows?

Bonus video: and here’s how you’d actually use one in combat.

According to Wikipedia, the last use of the Norden bombsight was during the Vietnam War: “The bombsights were used in Operation Igloo White for implanting Air-Delivered Seismic Intrusion Detectors (ADSID) along the Ho Chi Minh Trail.“

This entry was posted on Tuesday, August 18th, 2020 at 2:00 pm and is filed under Geek, History, Planes. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.