PLEASE NOTE: These are 18mm diameter engines designed for two-stage rockets. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. Estes B6-0/B6-6 bulk pack includes 24 engines (12 of each engine), 30 starters, 24 starter plugs, and ~72 squares of recovery wadding — all the rocket engine supplies you need to launch 12 *two stage* rockets! The B6-0 is a booster stage engine that has to be used in combination with a regular engine, and is for flights in rockets weighing less than 4 ounces (including the engines). The B6-6 is an upper stage engine for model rocket flight — it can also be used as a single stage engine in lightweight rockets. Recommended for use with the Mongoose, Taser Twin, and Solar Flare, or other compatible rocket kits This item will ship by US Postal Service only. B6-0 Technical SpecificationsTotal Impulse: 5.00 N-secTime Delay: NoneMax Lift Weight: 4.0 oz (113 g)Max Thrust: 12.10 Newtons (2.7 lbs)Thrust Duration: 0.80 SecondsLength: 2.8 in. (7 cm)Diameter: 18 mmWeight: .55 oz. (15.6 g)Propellant Weight: 0.23 oz (6.5 g) B6-6 Technical SpecificationsTotal Impulse: 5.00 N-secTime Delay: 6 SecondsMax Lift Weight: 2.5 oz (71 g)Max Thrust: 12.10 Newtons (2.7 lbs)Thrust Duration: 0.80 SecondsLength: 2.8 in. (7 cm)Diameter: 18 mmWeight: .64 oz. (18.1 g)Propellant Weight: 0.23 oz (6.5 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.
