PLEASE NOTE: These are mini (13mm 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 1/4A3-3T engine pack - includes 4 mini engines, 4 starters, and 4 starter plugs The 1/4A3-3T is a single stage mini engine designed for flights in lightweight rockets Recommended for use with the Gnome, Lunar Scout, or other compatible rocket kits This item will ship by US Postal Service only. Technical SpecificationsTotal Impulse: 0.625 N-secTime Delay: 3 SecondsMax Lift Weight: 1.0 oz (28 g)Max Thrust: 4.90 Newtons (1.1 lbs)Thrust Duration: 0.25 SecondsLength: 1.75 in. (4.4 cm)Diameter: 13 mmWeight: .21 oz. (6 g)Propellant Weight: 0.05 oz (1.3 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.
