Rocketry Starter Sets & Engines > Estes 24mm D Size   Estes C11-0 24mm (3-pak) model rocket engine The Estes C11-0 engine is a booster stage engine (red label) designed for model rocket flight and has to be used with a standard engine. This engine is for flights in rockets weighing less than 6 ounces, including the engines. Retail Price: $ 11.79 $ 8.95          Available: 2      More Information      Quantity:     Estes C11-3 24mm (3-pak) model rocket engine The Estes C11-3 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 6 ounces, including the engine. Retail Price: $ 11.79 $ 8.95          Available: 2      More Information      Quantity:     Estes C11-5 24mm (3-pak) model rocket engine The Estes C11-5 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 5 ounces, including the engine. Retail Price: $ 11.79 $ 8.95          Available: 2      More Information      Quantity:     Estes C11-7 24mm (3-pak) model rocket engine The Estes C11-7 engine is an upper stage engine (purple engine) designed for model rocket flight. This engine can also be used as a single stage engine in lightweight rockets. Retail Price: $ 11.79 $ 8.95          Available: 3      More Information      Quantity:     Estes D12-0 24mm (3-pak) model rocket engine The Estes D12-0 engine is a booster stage engine (red label) designed for model rocket flight and has to be used with a standard engine. This engine is for flights in rockets weighing less than 14 ounces, including the engines. Retail Price: $ 17.49 $ 12.75          Available: 3      More Information      Quantity:     Estes D12-3 24mm (3-pak) model rocket engine The Estes D12-3 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 14 ounces, including the engine. Retail Price: $ 17.49 $ 12.75          Available: 4      More Information      Quantity:     Estes D12-5 24mm (3-pak) model rocket engine The Estes D12-5 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 10 ounces, including the engine. Retail Price: $ 17.49 $ 12.75          Available: 3      More Information      Quantity:     Estes D12-7 24mm (3-pak) model rocket engine The Estes D12-7 engine is an upper stage engine (purple engine) designed for model rocket flight. This engine can also be used as a single stage engine in lightweight rockets. Retail Price: $ 17.49 $ 12.75          Available: 4      More Information      Quantity: