My backup props and installed props have different numbers such as installed ones marked as B4 and backups ones B7. Is there any difference between them? Or only there are two types of props one clockwise and the contraclockwise?
There are A props and B props and they are matched to the arms on your Breeze. The number at the end of the A or B is the cavity number from the injection mold die. In our manufacturing process we used the cavity numbers for quality control purposes. Hopefully Yuneec did the same.