The first aircraft to be purposely designed as a radar-equipped nightfigher, Northrop's P-61 Black Widow was heavily influenced by early RAF combat experience with radar-equipped aircraft in the years 1940/41 of World War II (1939-1945). Built essentially around the bulky Radiation Laboratory SCR-720 radar, which was mounted in the aircraft's nose, the P-61 proved to be the largest fighter ever produced for frontline service by the USAAF. Twin-engined and twin-boomed, the Black Widow was armed with a dorsal barbette of four 0.50-in Browning machine guns and two ventrally-mounted 20 mm cannon. This volume features all the frontline users of the mighty P-61, and includes many first-hand accounts from pilots and gunners who saw action in the Pacific, Mediterranean and Western Europe.
"The P-61 Black Widow is one of the most interesting aircraft of WWII. Although it did not serve in great numbers, this technologically advanced aircraft had a pioneering role as a night fighter using radar and heavy armament to intercept enemy planes... The book has an appendix of P-61 victories, units and specifications of the different variants. Illustrated with many waritme photographs, the book also includes an extensive color plate and aircraft profile section." -www.pacificwrecks.com
P-61 Black Widow Units of World War 2 by Warren Thompson