Some years back one of the mags did an article using a 1 liter soda bottle and dry ice to generate CO2 gas. They found the bottles exploded about 250 psi with a resounding bang and a fair amout of collateral damage to the airframe. An appropriate pressure relief valve would prevent that from happening. Of course AIRHOG has some cheap air powered motor free flight planes, that I thought would be fun to play with using a greater duration "air" supply.

"So little time"

Crosman has larger capacity CO2 cartridges for their airguns, but you would have to adapt the connection to the line to the engine, if it like I remember.

Regards,

Richard