Standing over 27 inch tall with wood fins and powered by E and F engines the Doorknob can reach the maximum altitudes of 1100 ft. on an F15-6 Estes engine. The 18 inch nylon parachute creates a long, smooth recovery. An easier build than other pro series kits, the Doorknob is a great introduction to rocketeers looking to increase their building skills and practice using higher powered engines. As a bonus, this kit has two sets of decals available for those who want to turn this scale model into a sports model. - SKILL LEVEL: Advanced - LENGTH: 26.9 inch (68.3 cm) - DIAMETER: 3 inch (76 mm) - EST. WEIGHT: 10 oz. (283.5g) - RECOVERY: 18 inch (45.7 cm) nylon parachute - PROJECTED MAX ALTITUDE: 1100 ft. (335 m) - RECOMMENDED ENGINES: E16-4, F15-4, F15-6 w/Engine Adapter - D12-3