Abstract
In our laboratory, manufacture and flight tests of PET bottle rocket and flow visualization around water rocket model in the first semester of 2nd grade have been carrying out as introductive education of fluid engineering. The objective of this paper is to enable the students in the first semester of 2nd grade to understand a stall phenomenon arising in the water rocket at the optimum launching angle, which is calculated by a computer. The separated line around the water rocket at the attack angles of 0 to 45 degree have been visualized by using a phenolphthalein method in an experimental apparatus of an improved water tunnel.
