Estes Model Rocket Engine, Model 1/2 A3-2T, Pack of 24

Each pack contains igniters, igniter plugs, and recovery wadding. Letter indicates engines maximum total impulse (equal to the engines thrust in Newtons times the length of engine burn in seconds): A=2.5 N-sec, B=5 N-sec, C=10 N-sec. First number indicates engines average thrust in Newtons. Second number is the delay time in seconds between end of thrust and start of ejection charge. For example, an A6-4 engine has the same thrust and delay time as a B6-4 engine but burns only half as long. The 1/2A3-4T and 1/2A3-2T engines have half the average thrust of an A engine and are smaller than standard...