Motors / Engines

Designation of Engin Codes
The first letter is the power code (Total Impulse/Total Power).  As an example, a "B" engine has twice the power of an "A" engine (see figure below). The second number is the average thrust level. For instance in a B6-4 the engine produces 6 newtons of thrust over it's burn time (a newton is equivalent to 0.225 pounds of thrust). The last number is the delay time in seconds before the ejection charge will fire after the burn is complete (also called burn-out). So on a B6-4 there will be a 4 second delay after burn-out before the ejection charge fires. With these designations you can also calculate the approximate burn time. Using the table below, divide the maximum power by the average thrust.

Engine Color Codes
Green - Single stage.
Purple and Blue - Top stage of Multi-staged rocket.
Red - Booster and Intermediate staged rocket.

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