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In an octo-copter design, is it better to put four pairs of counter-rotating props over each other so that each pair works in a column together? Or will you get more power or efficiency from staggering all eight props?

In other words,It seems it would you get better performance frombe more convenient to position them in pairs with a CW and CCW prop on the configuration shown below or fromsame axis, but I am wondering if this reduces the efficiency of the thrust to have them producing a single column of forced air rather than two separate propellers?columns.

enter image description here What are the physics involved?

In an octo-copter design, is it better to put four pairs of counter-rotating props over each other so that each pair works in a column together? Or will you get more power or efficiency from staggering all eight props?

In other words, would you get better performance from the configuration shown below or from two separate propellers?

enter image description here

In an octo-copter design, is it better to put four pairs of counter-rotating props over each other so that each pair works in a column together? Or will you get more power or efficiency from staggering all eight props?

It seems it would be more convenient to position them in pairs with a CW and CCW prop on the same axis, but I am wondering if this reduces the efficiency of the thrust to have them producing a single column of forced air rather than two separate columns.

What are the physics involved?

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