Estes Big Bertha Flying Model Rocket Kit, Intermediate Skill Level (001948)Skill level 1 Laser cut wood fins, self stick decals, 18 in. (46 cm) parachute recovery Projected max altitude: 500 ft. (152 m) An Estes original Laser cut balsa fins Big Bertha is an Estes original! Shes an all around Estes favorite that has truly withstood the test of time. Over the decades, Big Bertha has been most modelers first big build. If youve never flown a Bertha, get one and launch it. Once youve flown it, youll take it to every launch! The