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(Just to make sure: In order for a co-axial propeller to be more efficient it definitely needs to be contra rotating.) Contra-rotating propellers are supposed to more efficient because the rear propeller can recover the rotational energy of the wake of the front propeller. However, the...

You obviously have difficulties understanding the term efficiency and unfortunately allege things I did not claim. Again, If you say: Then your following statement is contradictory: Explanation: If two contra rotating propellers are more efficient than a single propeller then they must...

You misunderstood. Again: If two contra rotating propellers are more efficient than a single propeller then they must generate more than double the thrust, if each propeller (of the two contra-rotating propellers) receives the same amount of power as the single propeller. Or in other words (if...

If: Then the following statement is contradictory: Efficiency is essentially thrust/power. (The more thrust you receive for a given power input, the more efficient your system is). If two propellers are more efficient than a single prop they would need to generate not just twice the thrust...

A flat 8 octocopter is not more efficient than a flat 4 quadrocopter, it can just carry double the load (but it also consumes double the power - so the efficiency remains unchanged). The reason why contra-rotating propellers are more efficient is because the rear propeller recovers the...

I wonder why people keep on saying that a coaxial propeller is less efficient? Since as long as the coaxial propellers are contra rotating they are more efficient than single props: http://en.wikipedia.org/wiki/Contra-rotating_propellers Contra rotating propellers and fans have been applied in...