|ASTM, EN71, ce, CCC
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For electric model helicopters, these numbers indicate the specifications of the motor. Generally, the specifications of brushed motors such as 130, 280, 370, and 540. The numbers represent the length of the motor, such as the 130 level (about 13mm-15mm in length). The general length is The greater the power, but we can find that some nominal 370-level brush motors are only 28mm-32mm in length. This nominal designation indicates that the power of this 280-level electric level is equivalent to 370-level.
Brushless motors generally use both diameter and length to be nominal, such as 2030, that is, the diameter of the motor is 20mm and the length is 30mm. Of course, there are also brushless motors with a nominal value of 130, 280, and 540, but this has nothing to do with the size of the motor. It refers to the level of the brushed model that is equivalent to the size of its model airplane.
For oil-powered model helicopters, the level represents the working volume (ie displacement) of the engine. The unit is often cubic inches, and every 100 levels is 1 cubic inch. For some large gasoline model helicopters, cc is often used to express its displacement.