From: St.Petersburg, Russia
Also, there are some plane engines that are available LATER than some airframes that use them:
1. Mitsubishi Ha-42 available in Oct '45, while the Ki-67-Ia is available in Apr '44, and the Ki-67-Ia(T) is available in Jun '44
2. Nakajima Ha-44 available in May '43, while the B6N1 is available in Feb '43.
3. Nakajima Ha-45 available in Sep '43, while the N1K1-J is available in May '43.
Is that as designed, so that to use the planes at those dates one must research the engines?
These are my oversights. With the latter two it is probably insignificant, they likely will be online in time anyway if you just leave their initial factories as they are, but #1 this might be important, without building a big factory you won't get it in time. It is the historical engine for Ki-67, though. John, I think we should fix that.
A "quickfix" for ongoing games - expand your Ha-42 factory to, say, 100 at the beginning of the game (you'll want at least 50 Ki-67 per month anyway, right?), which should give you this engine around November of 1943. Unfortunately, some potential engine production is going to be lost while your factory is busy researching, unless changes to availability dates can be applied to ongoing games.