This is intended simply as anecdotal information on the B-26, not to validate or invalidate the AH B-26 FM. The information does have an impressive pedigree, though.
From "I Could Never Be So Lucky Again", by James H. Doolittle, ISBN0-553-29725-2.
"On one occasision, I took Maj. Paul W. Tibbets up for a ride. Paul was one of the pilots who had flown Teneral Eisenhower down to Gibraltar and was partial to the B-17 because he felt the role of the B-26 as a medium bomber would be limited. He wanted to fly the big ones, but I wanted him to see what the Marauder could do. Paul tells what we did in his memoirs:
'I should have suspected that Doolittle knew more about the B-26 than he admitted when he said, "It's just another airplane. Let's start it up and play with it."
That is exactly what we did. We got in the air and circled to 6000 feet, remaining close enough to the field to reach the runway if we had trouble. But everything went smoothly.
Doolittle then shut down one of the engines and feathered the propeller. He got the airplane trimmed and we did some flying on one engine, turning in both directions, climbing, making steep banks. The Marauder was a tame bird with Doolittle at the controls.
Suddenly he put the plane into a dive, built up excess speed and put it into a perfect loop -all with one engine dead. As we came to the bottom of the loop, he took the dead propeller out of feather and it started windmilling. Whe it was turning fast enough, he flipped on the magnetos and restarted the engine as we made a low pass over the airfield. We came around in a normal manner, dropped the gear and the flaps, and set the B-26 down smoothly on the runway.
The pilots and operations people who had been watching us were impressed. The flight was an important start toward convincing them that the B-26 was just another airplane.' "
Just a vignette from history.