translation.en: Hexacopters and octocopters, with six and eight propellers, can provide redundancy, but quadrocopters are much more popular because they have the minimum number of fixed motor propeller pairs: four.
translation.zh: 六轴飞行器和八轴飞行器各带有带六个和八个螺旋桨 可以提供冗余。 但四轴飞行器更普遍， 因为它们的固定电动螺旋桨数量最少： 四个。