article_snippet.sent: These channels have been designed to reduce how much drag the air flow is subjected to as the air flow moves through the 'ball'.
article_snippet.sent: And the holes have been designed in such a way so that the flow collects additional air at is leaves the device to boost the device trajectory and output.
article_snippet.sent: In particular, there is a central outlet. 
article_snippet.sent: It can be used as circulator.