Some fun examples. The F-15E, F-18E "It's just an upgraded version", don't get me wrong they are good planes, but they are 20 percent larger than previous mode

Some fun examples. The F-15E, F-18E "It's just an upgraded version", don't get me wrong they are good planes, but they are 20 percent larger than previous models it is a different plane, with different jigs, parts, testing, performance. The tu-22m, A least the f-15e is the same shape as the f-15. "Yes boss, I understand we don't have the money to design a new bomber, we are just going to upgrade the design of one of our existing models" Proceeds to design a completely new plane and gives it the same designation of an existing one. https://en.wikipedia.org/wiki/Tupolev_Tu-22M https://en.wikipedia.org/wiki/Tupolev_Tu-22M