ESTES 1601 B4-2 Single Stage Model Rocket Engine 3 Pack (Ships USPS Ground Only) HOn3 Couplers Grex TK-2 0

Grex TK-2 0

E-flite 37000 Apprentice STS 1

1 x Lower wing mount Left

Optional SSD brass weights are available

the motor and the body

ESTES 1601 B4-2 Single Stage Model Rocket Engine 3 Pack (Ships USPS Ground Only) HOn3 Couplers Grex TK-2 0ESTES 1601 B4 2 Single Stage Model Rocket Engine 3 Pack Ships USPS Ground Only The Estes B4 2 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs. SPECIFICATIONS: Length: 2. 8 in. (7 cm) Diameter: 18 mm Estimated Weight: . 66 oz. (18. 7 g) Total Impulse: 5. 00 N sec Time