steve dickey wrote:
You say the B-29B is your fav, Ida figured you already knew they had those bulged blisters in that position

Flush plug windows, OK guess I didn't know they came with them

The B-29B had a similar flush window to the type used on the Silverplate airplanes. Since there were no turrets or CFC system, a single swivel mount .50 caliber was proposed, to be mounted in the waist positions with a compensating sight. We're not entirely sure the 315th Wing took the waist guns into combat, but the scanners were trained on them at the Phase Training bases in Nebraska. If the guns were to be employed it appears that the airplane would first have to be depressurized, the plug removed, and the gun deployed. This photo is of the Boeing development for the single waist gun during preliminary studies.
This picture was taken at Harvard AAF during the Second/Third Phase Training of the 501st Bombardment Group (VH) and shows scanners learning how to track targets with the single machine gun.
Here is one of my favorite photos of new B-29Bs of the 16th Group in flyaway storage at Fairmont AAF in March of '45. You can see the flush waist window on the second ship.
This is a better view of the waist position on another 16th Group B that had a hairy encounter with a tree during an instrument approach to Fairmont. You can see the airfoil of the APQ-7 antenna under the flap.
And here is the only armament on a B with the APG-15 beneath the guns. It's a little hard to tell in this photo, but most, if not all, Bs had three .50s rather than two.
Scott