PLEASE NOTE: These are large (24mm diameter) engines that will only fit certain model rockets. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. Estes D12-3 engine pack - includes 2 engines, 2 starters and 4 starter plugs The D12-3 is a single stage engine designed for rockets with a maximum lift weight of less than 14 ounces Recommended for use with the Big Daddy, Super Big Bertha, Majestic, Mars Longship, or other compatible rocket kits PLEASE NOTE: This item will ship by US Postal Service only. Technical SpecificationsTotal Impulse: 20.00 N-secTime Delay: 3 SecondsMax Lift Weight: 14.0 oz (396 g)Max Thrust: 32.90 Newtons (7.4 lbs)Thrust Duration: 1.60 SecondsLength: 2.75 in. (7 cm)Diameter: 24 mmWeight: 1.57 oz. (44.5 g)Propellant Weight: 0.85 oz (24.2 g) Please verify that these engines are compatible with your model rocket before purchasing. This product is warranted by Estes against defects in materials or workmanship from one year of the original purchase. Please retain the warranty information included in the package so that you may reference it in the event that you receive a defective or malfunctioning product as the engines are not returnable by mail.
