Finally success. 1/2 inch pipe groove where bottle mouth will be and fille with o-ring or in our case bead of hot glue. Then cork bottom and make pinhole in side for air pump. Then place bottle (with or without water as you prefer) over tube and down unto the groove/bead line. The bead holds bottle until too much pressure created. Simple but the easiet and smallest air rocket launcher I've seen.....of course I've only seen one !!
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