I'm surprised we got this far into the thread before some anal-retentive rocketeer started quoting that model rocket code pointing out what a model rocket is. I guess I'll jump into the role.

Deploying chemicals doesn't seem to fit anywhere in that code. You may be able to use certain model rocket components to create some kind of chemical deployment rocket system, but are you actually concerned with a safe recovery of the rocket or is the extinguishing of the fire a priority?

If people are using artillery shells to seed clouds, I doubt it would be practical to get enough lift from model rocket components to put a significant amount of chemical into the clouds to make a difference. You might want to explore some of the High Power rocket forums and pose your question there.

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