Deralderistgelandet: "Didn't the B-29 carry a heavier payload over a farther distance and accuratly drop that payload" No it did not. Not during conflict in WWII. Remember the B-29 was refined after the war. Focus on what occured during the war.
"You also talk about poor engine reliability. That was later fixed." Yes, after the war.
You are completely missing the point. Any of these problems were not caused because of the B-29.
As others have allready stated the B-29 flew low level missions because of the Jet Stream.
Any Bomber inluding the Lancaster would have these same problems if it could fly at those altitudes.
The engine reliability problems were not that bad of problem late 1944 onwards as can be seen by the number of aircraft used.
JDCAVE said:"Didn't the Lanc not evolve from a less successful aircraft called the Avro Manchester." The last time I looked the Lancaster was an entirely different aircraft with different rudders, tail plane and had 4 engines.
Again you are seeing past the point.
Was or was not the Lancaster and evolution of the Manchester? Did or did not the Manchaster have engine problems?
Also another question. You say the B-29 and the B-17 were designed for high altitude bombing (which is correct) and that is why they were so heavily armed.
What does the armament have to do with being high alltitude or low alltitude?