The design of the "B" Model was to save weight by removing all of the guns and sighting equipment used on other B-29s, except the tail gun. The weight savings allowed the B-29B to fly a little higher and a little further. Most of the bombing of the Japanese Empire by B-29s stationed in the Marianas was to the southern parts of Japan. The 15th and final mission of the 315th Bomb Wing and the final mission of the war, was a round trip of over 3650 miles to the Nippon Oil Company at Tsuchizakiminato (in Akita prefecture), on the north west coast of Honshu, the main island of Japan.
The B-29B aircraft also had two new radar units installed. One was the AN/APQ-7 Eagle Radar for bombing and navigation and the other was the AN/APG-15 used for aiming the tail gun.   These two radar units gave the B-29B a distinctive shape as the APQ-7 antenna appeared as a small wing under the fuselage, between the two bomb bay doors and the APG-15 added a ball shaped antenna to the tail of the aircraft below the tail guns.
General Armstrong in Fluffy Fuz III, lining up for take off for first Empire mission flown by the 16th and 501st Bomb Groups, units of the 315th Bomb Wing, June 26, 1945. Following is Aircraft named Fleet Admiral Nimitz of the 501st Bomb Group.
Aircraft named Fleet Admiral Nimitz of the 501st Bomb Group, taking off for first Empire mission flown by the 16th and 501st Bomb Groups, units of the 315th Bomb Wing, June 26, 1945.
B-29B landing at Northwest Field, Guam.
Note the wing shaped radar antenna between the main landing gear. This photo is an enlargement of a photo found further down the page.
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