Baby Bertha flying model rocket kit by Estes #1261. A miniature version of one of the most popular kits of all time, the Big Bertha. The Baby Bertha soars to 575 ft. (175 m). It has die cut balsa fins and can be launched on A, B and C Estes engines. Length: 12.75 in. (32.4 cm), Diameter: 1.64 in. (41.7 mm), Weight: 2.1 oz. (58.2 g), Recovery: 12 in. (30 cm) Parachute, Fins: Die cut balsa, Maximum Altitude: 575 ft. (175 m), Recommended Engines: A8-3, B4-4, B6-4, C6-5.