Subject: Using carbon dioxide for the propulsion of model rockets

For model rockets most people use pyrotechnics (such as in fireworks 
rockets). However, this can be dangerous and there are legal problems 
to it. So, I came up with the idea to use water being ejected by 
carbon dioxide that is generated from baking soda + vinegar (or 
something similar). 
Has anyone ever done this? I searched the internet (including 
Mad Scientists library) but didn't find anything appropriate. 

Please note: Our model rockets are strictly NON-military 
For further info see http://members.aol.com/hpboehme/DERA.htm

                   Many thanks, A.
                    

Re: Using carbon dioxide for the propulsion of model rockets