4 ms·

I feel like it would chop up The air too much for the second propeller?

• andlier 9y ago
  The issue with the «chopping» is noise level. Counter rotating propellers are more efficient than a single propeller. «Contra-rotating propellers have been found to be between 6% and 16% more efficient than normal propellers.» https://en.m.wikipedia.org/wiki/Contra-rotating_propellers https://en.m.wikipedia.org/wiki/Contra-rotating_propellers