dublish said:
Rocket test sites in general reduce the need for highly skilled rocket tech teams like von Braun. However, nobody in their right mind would have von Braun research 1943 INF (which has a rocketry component) or similar techs, which require more areas of expertise than most of our best rocketry tech teams specialize in.
As for building factories instead of rocket sites from 1936 to 193X, and then building rocket sites starting in 1939... I can think of many things I would rather be building in 1939 than rocket sites. Panzers or bombers will certainly be needed.
See the
wiki for some numbers. I'm sure the rocket test sites have been analyzed in some old HoI2 threads, but I'm not going to go looking for them.
OK, you are right about Infantry but they are 43 and 45 techs and Messerschmitt has rocketry specialty so the difference for the airplanes would be small.
So, IMO you definitively do not need (a lot) rocket facilities before 41-42.
There are also Motorised and Mechanized Infantry (starting since '41) but by that time you should have at least 3 rocket sites (following my plan below).
However regarding starting moment for rocketry sites, you forget that those factories will increase your overall IC, so you may have your "old" IC for upgrades or wahtever in 39 and "extra" IC for rocket facilities.
Assuming you start with 4x3 (or 4x4) IC runs in 36. In January 37 you have 4 IC "free" plus 15% from centralization slider (total 4.6) which almost allows for another factory run (say you borrow lacking IC and will return next year)
In '38 you can push (I usually do) another centralization move and gain 20% bonus (from base 9IC) giving you almost 11 "free" IC (so you can start another "free" factory). Which means that by the second half of 38 you have increased your base IC by 15 (and overall IC by 18) !!!
If you wait with rocket facility runs till second half of 39 or make last centralization move (instead of standing army) in 39 you can have base IC increase between 15 and 22 and overall IC increase in range between 18-27.5 !!!
Which means that your rocket sites production is for free!! you might have even free IC bonus for e.g. SP-ART and ENG brigade production.
If you start rocket facilities in 39 you benefit from your hawk settings (production will be much faster that in 36) and you may be able to churn out 3 or 4 sites before you may need it for those rocketry components in Infantry techs. Additionally, after finishing your rocket site production you have all your "free" IC available for anything else and you receive also TC bonus.