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Rocketry Glossary
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Motor Diameter
The diameter of a hobby rocketry motor casing. Most commercially-manufactured motors are made in standard sizes. Motor diameters are most commonly expressed in millimeters. The most commonly seen motor diameters are 10.5mm, 13mm, 18mm, 24mm, 29mm, 38mm, 54mm, 75mm, and 98mm.
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