Ok, here's one more bad idea: The Uralbomber, and specifically the He-177 Greif (Gryphon).
So the whole idea started in 1933, under the Uralbomber project, under Walther Wever, a proponent of strategic bombing. Literally a 4 engine strategic bomber able to bomb the Urals. Hence the name. But Wever dies in an airplane crash in 1936, and is replaced by Albert Kesselring as chief of staff of the Luftwaffe. Kesselring, like many others in the Luftwaffe (like Udet, Milch, etc) was more of a proponent of dive-bombing as tactical support for the troops.
And so begins the slapstick tale of trying to turn a 4 engine prototype the size of a B-17 into a dive bomber.
So first it goes from 4 engines driving 4 propellers to 4 engines driving 2 propellers to reduce propeller drag in a dive. They literally crammed two engines stacked on top of each other in each nacelle.
And immediately hilarity begins to ensue, as wings fall off when recovering from a dive (torque is a lot larger on a B-17 sized wing as opposed to a Stuka sized one.) Try a shallower dive angle? Wings still break off. Or the engines catch fire. Then a cycle of reinforce the wings, improve cooling, now the landing gear breaks off due to the weight, reinforce that, something else breaks, and so on for years.
Eventually resulting in something that couldn't dive bomb, but to make up for it, couldn't accurately level-bomb either
And normally I'd say, yeah, ok, they were experimenting with what works and what doesn't. Lots of people did that in WW2 and lots of projects went nowhere. Amirite?
But here's the thing: this thing was actually ordered into production while still a very bad experimental aircraft. OVER A THOUSAND of these death traps were produced during WW2, and most were worked on constantly to change them to the latest design. E.g., some 200 went back to have their fuselage lengthened.