Estes 1602PK2 B4-4 Model Rocket Engines, 6 Count – 18mm Single-Stage Motors with Starters & Plugs and hot rod

and hot rod

replay and zoom function supported

Shrouded banana to SMD tweezer probe

uncompromised performance

while the self contained hydro pneumo powered models are fun both indoors and out

Estes 1602PK2 B4-4 Model Rocket Engines, 6 Count – 18mm Single-Stage Motors with Starters & Plugs and hot rodPLEASE NOTE: These are 18mm diameter engines. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. 2 Packs of Estes B4 4 engines total of 6 engines (each pack includes 3 engines, 4 starters, and 4 starter plugs) The B4 4 is a single stage engine designed for model rocket flights weighing less than 3. 5 ounces, including the engine Recommended for use with the Baby Bertha,