Big Bertha is the fat, slow, friendly one: 24 inches tall on a 1.64 inch tube, with balsa fins and an 18 inch parachute. Estes has kept it in production since the 1960s, and it is still the model people recommend when someone asks what to build after a starter set. Flights top out near 500 feet on a C6-5, and the liftoff is slow enough to watch properly instead of catching a blur.
Because it flies low and lands soft, it survives seasons of use and gets cloned, painted, upscaled and fitted with camera mounts by club members. B engines make it a small field rocket. The wide body needs real painting time, the big canopy drifts in wind, and anyone chasing altitude numbers will be bored by it.
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