Despite having names like "SP Artillery," "SP AA," and "Tank Destroyer," self-propelled brigades do not improve based on research in the Artillery tab - these improvements are specific to line artillery/AA/anti-tank and support artillery/AA/anti-tank. This means you can offset the higher cost of researching armor by using army experience to improve your SP brigades - this is quite a plus for larger nations that end up with 500 unused army experience when all is said and done. So overall, the impact of researching self-propelled variants is not too great - you don't necessarily need to research each variant, and if you can afford to research tanks at all, you can probably afford to research the tank variants you need.Īs with tanks, the improvements to self-propelled brigades come primarily from production of variants, rather than techs.
The research cost of each tank model is either 2.0 or 2.5. Industrial research costs vary from 1.5 to 2.5, while artillery research costs vary from 1.0 to 2.0.
This should help to put the research cost in perspective. If you reach a -25% modifier, then this becomes a mere 30 days. Each variant has a low research cost - 0.5, which typically translates to 40 days. Self-propelled units require researching the associated tank first, then researching the self-propelled variant. The first thing that might turn you off from self-propelled brigades is the fact that they require a bit more effort to research. SP can also be an alternative to Artillery, as it boosts the hardness of leg divisions. Basically, you should consider the combination of Tank Destroyers + SP Art to be an offensive alternative to tanks, and you should consider SP AA to be a counter to enemy TAC and CAS.
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