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Each pack contains igniters, igniter plugs, and recovery wadding. Letter indicates engine's maximum total impulse (equal to the engine's 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 engine's average thrust in Newtons. Second number is the delay time in seconds between end of thrust and start of ejection charge. Rocket engines contain flammable solid material; each shipment has an additional hazardous shipping charge.

Each pack contains igniters, igniter plugs, and recovery wadding. Letter indicates engine's maximum total impulse (equal to the engine's 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 engine's 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 size (denoted by the "T").

Note: Rocket engines contain flammable solid material; each shipment has an additional hazardous shipping charge.

Note: Residents of CA, ND, NJ, and RI may be subject to additional state age or permit requirements when purchasing this item.