September 2 2018 - Estes Prowler on an E16-4 with on board footage from an 808 Keychain Camera. Jolly Logic Chute release failed - Either I used too large of a rubber band or I jostled it and it released before takeoff. Jolly Logic Altimeter Two - 523ft Apogee Ejected at 495ft - Delay of 4 seconds not long enough Simmed in OpenRocket to go just over 600 feet. I had the weight of the camera entered, but not the aero drag that probably caused some of the difference.