Direct research, rather than quotations from books written by other people, will allow a realistic understanding of the Allied bomber offensive in WW2.
Some may be interested to know that Germany tried hard to develop long-range heavy bombers. Fortunately for us, they were over ambitious in the design of the He177 (with DB610 engines). The political/military drive for this heavy bomber is shown by the production of over 1500 DB610 double-engine units (the equivalent of over 3000 DB605 engines) before the end of 1942. By the time that Germany gave-up on the He177, over 7000 DB610 engine units had been made for it.
Atomic bombs. German research had effectively validated the theory. They were certainly on the path to building a weapon.
OAP