Estes Big Daddy rocket beefed up to fly on 24mm motors. Launched on an Aerotech E18. The aft closure blew off the motor, the nozzle, propellant and delay grain were all ejected. Minor damage to the motor mount, unfortunately the aft closure was not recovered. I believe that the failure may have been due to the aft closure not being done up tightly enough. The Big Daddy survived this CATO and will be repaired and fly again. See the frame grabs from the video here: http://www.flickr.com/photos/oflittleinterest/3555785055/