172 Mitsubishi Ki-21 Sally

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Publisher: Profile Publications England
Cover: Soft
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Synopsis: The Mitsubishi Ki-21 "Sally" represents Japan's primary heavy bomber during the early years of World War II, providing the Imperial Japanese Army Air Force with strategic bombing capability that enabled long-range attacks throughout the China theater and early Pacific operations before more advanced Allied fighters neutralized its effectiveness. This comprehensive profile examines the development of this important bomber under Naoji Koyama's design leadership at Mitsubishi Heavy Industries, creating an aircraft that combined adequate performance with substantial payload capacity to provide Japanese ground forces with strategic air support. The book details the aircraft's conventional design philosophy that emphasized reliability, ease of maintenance, and adequate performance rather than revolutionary innovation, creating a bomber that could be produced efficiently while providing dependable service under diverse operational conditions. Technical specifications reveal the Ki-21's capabilities: powered by two Mitsubishi Ha-101 radial engines producing 1,450 horsepower each, achieving maximum speed of 297 mph at 15,485 feet, with range of 1,680 miles and maximum bomb load of 2,205 pounds for various attack missions against strategic and tactical targets. The profile analyzes the aircraft's straightforward construction featuring conventional stressed-skin aluminum structure, manual defensive gun positions, and robust landing gear designed for operations from unprepared airfields throughout the vast territories controlled by Japanese forces. Armament analysis covers the bomber's defensive weapon system including one 12.7mm machine gun in the dorsal position plus multiple 7.7mm guns in nose, beam, and ventral positions, providing comprehensive defensive coverage despite limited firepower compared to contemporary Allied bombers. Operational history chronicles the Ki-21's combat service beginning during the Second Sino-Japanese War, where the aircraft demonstrated its strategic bombing capability through attacks on Chinese cities, military installations, and industrial targets throughout the extended conflict. The book examines the aircraft's service during early Pacific operations including attacks on Allied airfields, ports, and military installations throughout the Philippines, Dutch East Indies, and other conquered territories during Japan's rapid expansion period. Combat accounts detail typical bombing missions including formation attacks on defended targets, analyzing the tactical procedures and defensive formations employed during operations over increasingly hostile airspace as Allied air defenses improved. The profile covers the aircraft's declining effectiveness as the war progressed and Allied fighter capabilities improved, forcing Japanese bomber units to adopt night operations and defensive tactics that reduced bombing accuracy and operational effectiveness. Technical sections examine the aircraft's conventional systems including navigation equipment, bomb release mechanisms, and communication systems that enabled coordinated bombing operations throughout the vast Pacific theater of operations. The book details various sub-variants including the Ki-21-I with original equipment, the Ki-21-II with improved engines and armament, and specialized versions equipped for reconnaissance and transport missions when bombing operations became too costly. Training operations receive coverage, analyzing the aircraft's use in training programs for bomber aircrew and the development of tactical procedures that maximized bombing effectiveness while minimizing losses to enemy fighter interception. Manufacturing details reveal production achievements with over 2,000 Ki-21s manufactured, demonstrating the aircraft's importance in providing Japanese forces with strategic bombing capability throughout the extended Pacific conflict. Notable operations featured include major bombing campaigns during the conquest of Southeast Asia, systematic attacks on Allied shipping and port facilities, and the aircraft's role in supporting Japanese ground operations throughout various Pacific campaigns. The profile analyzes the aircraft's operational limitations including modest defensive armament, lack of armor protection, and performance characteristics that became increasingly inadequate as Allied fighter technology advanced and air defense capabilities improved. Combat effectiveness analysis reveals the aircraft's success during early war operations when facing limited opposition, while acknowledging the heavy losses suffered when encountering modern Allied fighters and sophisticated anti-aircraft defenses. The book examines the aircraft's adaptation to transport and supply missions during the later war period, where Ki-21s provided essential logistical support to isolated Japanese garrisons throughout the Pacific despite the risks posed by Allied air superiority. Training and evaluation programs are detailed, examining the aircraft's use in developing bomber tactics and training replacement aircrew for increasingly hazardous bombing operations against well-defended Allied targets. Post-war assessment coverage includes Allied technical evaluation of captured aircraft, revealing the conventional design approach and adequate engineering that characterized Japanese bomber development during this crucial period. The profile examines the aircraft's influence on Japanese aviation development, providing operational experience and technical knowledge that guided subsequent bomber designs while demonstrating the limitations of conventional approaches against rapidly advancing Allied technology. Surviving examples receive attention, examining preserved aircraft and the recognition of the Ki-21's significance in Japanese military aviation history and its role in early Pacific War operations before Allied air superiority rendered strategic bombing operations unsustainable. The comprehensive profile includes detailed technical drawings, bomb bay configurations, and color schemes from various bomber regiments, providing essential reference material for understanding this important aircraft's role in Japanese strategic bombing operations and the evolution of Pacific air warfare throughout World War II.

172 Mitsubishi Ki-21 Sally, is one of the many primary source materials in the Army Air Corps Museum collection.