Various
Mdow:
How do we translate those numbers into something that all of the other countries can use?
If you checkout
http://www.warship1.com/ they actually have data for all the ships of all the major powers. I haven't done a rigid analysis for all the classes, but you could probably figure that the non-US times mostly reflect the baseline construction durations and the US times reflect the ship assembly technology. To give a good number for the USA I would probably average the durations over the whole war so the USA would end up with a penalty vs. real life in 1942/43 and a bonus in the longer run. However, instead of reflecting US duration, it would actually reflect Ship Assembly tech duration.
The one other HOI2 level change would be to change the whole queue so that if you overload the queue then everything would slow down proportionately. Especially in the 1930s, some warship construction was consciously used as a public works program.
Mdow:
I could make the case about machinery being the limited factor. Look at the different power plants that were used for different types of escorts. They were able to lay down more hulls than they were able to provide their ultimate power plant for (diesel engines). I think that when you get to large warships (battleships and carriers) then available slips became more of an issue because of the limited number of large capacity slips. Most countries can find land near deep rivers that is sufficient for building small warships (destroyers and escorts).
I agree. Machinery for small hulls and slips for big hulls. Still, the complexity of the issue is beyond what HOI gives us.
Mdow:
It is probably a good thing that the AI tends to focus more on land technologies than naval techs that are of questional value with the way that the game works. As much as I hate to admit it, the game tends to focus on armies as the root of winning.
You're right. Here's another HOI2 sort of suggestion. Control of the sea really comes down to the ability to move merchant ships over the oceans and get large quantities of stuff from point a to point b relatively cheaply. When Vichy can get its rubber from the Congo to Algiers via the Sahara Desert then it defeats the reality of maritime power. It would seem to me that one solution would be to prevent tracing supply or convoying resources through any land province that has an infrastructure of less than 34 unless the province is adjacent to a 34 or greater province. Ports would allow supply to the province the port is in and adjacent provinces. This would prevent impassible areas like remote Siberia, Tibet, the Sahara, etc. from serving as supply routes. The map also needs to be changed to make more of those Pacific islands real islands instead of marching from Palua to Truk.