Rocketry Warehouse 84 INCH STARCHUTE, Fruity Chute Iris Ultra 84" Parachute, or dual Rocketman RC9. What to use as a main in a 18-19LB rocket? The bag for the chute is a fruity chute 4" X 14" with approximately 149 cu" volume. Actually the post burn out will be around 24-25lbs pad weight 31-32lbs.