Building my Super Big Bertha
February 27, 2022 This kit was purchased in 2000 and designed to fly on D12-5 engines (only). It's 36" tall and 2.5" in diameter with an 18" parachute. The current version of the Super Big Bertha is designated a Pro Series II model and designed to fly with bigger 29 mm engines, projected to fly to 1200 feet on an Estes F15-6. ( https://estesrockets.com/product/009719-pro-series-ii-super-big-bertha/ ). Not wanting to be embarrassed flying a "wimpy" Super Big Bertha on D engines, I ordered 29 mm engine tubes from Estes and plywood engine mounts from Apogee. Here are the modifications I'm planning to upscale my 2000 vintage Super Big Bertha: Use a 29 mm engine tube to expand what kind of engines I can use. Use an Estes Pro 29 mm motor retainer set instead of hook & engine block. Hand cut engine mount for 29 mm from extra 2.6X 18 mm cardboard mount. —><— Decided to buy pre-cut plywood engine mounts from Apogee instead! Cut the 24 mm stuffer