Quick view Add to Cart Estes ES1523 Standard Rocket Engine C11-5, D Size ES1523 $29.95 inc GST The Estes C11-5 engine is a single stage engine designed for model rocket flight. This engine is a 24mm diameter engine designed for rockets with a maximum lift weight of less than 5 ounces. Includes: 2x C11-5 Engines 2x Igniters 2x Igniter... Compare