http://www.ApogeeRockets.com - A common question in model rocketry is what does the engine code printed on the side of the motor casing mean? An even more important question is how do you use that engine code to pick the right motors for your model rocket? This is a very basic introductory video for those people that are new to rocketry. In it, I'll go through the letter and the numbers and explain what each one means, and how you can make a comparison in order to select the right motors for your next flight. If you prefer this information in written form, you can view our website and select any rocket engine. We put this information on all the engine pages so that people selecting motors for the first time have some background information to review.