The Estes C11-7 engine is a single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 170g, including the engine.

What do all the letters and numbers in the the motor name mean?

Lets take an example so you can see how to read the charts. As an example, we'll look at the "1/2A3-2T" motor.

Breaking it down, we have four bits of information. "1/2A," "3," "2," and "T"

The first letter, "1/2A," in our example, is the power level classification of the motor.  The "1/2" power band, as the chart to the right shows, is greater than .625 Newton-seconds of Total Impulse, and less than 1.25 Newton-Seconds. The maximum power doubles from one letter to the next. So a "B" motor can have twice the power of a "A" motor; which means it will fly approximately twice as high.

11-7 (2 ea) (UN0432 1.4s DG) - EST-1524