Launch of Estes Ventris Model Rocket. It was modified for dual deployment. Ejection charges of 0.5-g (FFG) and 0.6-g (FFG) were used to separate the lower and upper halves, respectively. A StratologgerCF altimeter was used to monitor the flight. Unfortunately, the shock cord that held the drogue chute broke. Fortunately, everything landed without anything being damaged.