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 1/2A3-4T engine pack -includes 4 mini engines, 4 starters, and 4 starter plugs The 1/2A3-4T are made to fit smaller rockets, but they will pack a punch! Recommended for use with the Gnome, Star Hopper, or other compatible rocket kits This item will ship by US Postal Service only. Technical Specifications: Total Impulse: 1.25 N-sec Time Delay: 4 Seconds Max Lift Weight: 1.0 oz (28 g) Max Thrust: 8.30 Newtons (1.9 lbs) Thrust Duration: 0.30 Seconds Length: 1.8 in. (4.6 cm) Diameter: 13 mm Weight: .23 oz. (6.5 g) Propellant Weight: 0.07 oz (1.9 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.
