my apologies if this has been covered before, but... what about changing Allied aircraft production and upgrade paths so that aircraft are (mostly) produced at bases on the map (including the Allied off-map bases), rather than by the replacement rate?
So, for example, the F4F-3 and F4F-3A are both set to upgrade to the F4F-4, and when the F4F-4 becomes available, the F4F-3 and F4F-3A factories switch to the F4F-4. These two factories, plus the one that is set to produce F4F-4 from the start, would then switch to producing the F6F-3 when that becomes available, which then is replaced by the F6F-5 and so on.
That way, production would be switched from obsolete to current models, rather than filling the pool with older models that are already being replaced. To a large degree, this would also make production end dates obsolete.
What is the great difference between just using end dates for the aircraft models ?
One, relatively small, difference is that factories can take up to a couple of weeks to upgrade. So, if you're planning on starting production on the 1st, you may have to wait a bit.
Another issue, largely or completely taken into account via existing factories, is that Japan could bomb/damage factories within reach of it's aircraft.
Also, production doesn't alwasy ramp up, or increase, as models are coming online. So, F4F-3 production plus F4F-4 production might be more than what F4F-6 production actually was. (as an example)
I've tried to add factories to cover all production, but it's impossible. Some aircraft have time between models where neither are produced. Some lines are difficult to tell what aircraft they upgrade to. A lot of models actually decrease in production when you add up all the previous line production numbers. Allies start to gain more and more paths of aircraft, and you need to be Tim Tom to fully know the correct factory changes.
Basically, I think it would be impossible to make full factory production for PBEM games. But, vs the AI, you can do anything you want.
for those of us who are too anal, it's a great theory. But, I can't see how it would be accurate in practice.
Interesting, didn't know about the upgrade delay that factories can have. Of course the chance to get the factories bombed is there, but from the OP I gathered that wasn't actually one of the goals, the goal is to not to have old planes fill up their pools after they become obselete, which doesn't happen anyway AFAIK.