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What is the simplest way if you have a shaft rotating clockwise for it to have an extension that rotates anti clockwise. Least loss of energy is best so i think a mechanical mechanism would be best.

I am thinking is there a way you could use the main shaft in a turbo fan engine to drive another fan in the opposing direction in front of the original fan.

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  • $\begingroup$ Do you mean simple to build, or simple to maintain, or simple to calculate? Seems fairly straightforward to do with gears regardless. $\endgroup$
    – JMac
    Commented Apr 3, 2017 at 11:27

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Least loss of energy would be using one gear with adequate lubrication.

I prefer planetary gears because they last much longer and distribute the load better. Plus you can do it with a hollow shaft. The center shaft turns clockwise, the planet gears turn counterclockwise as does the outer shaft.

Here is a link that should show you a gif of the gear in action.

https://giphy.com/gifs/yXQrz0IscQeWs

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  • $\begingroup$ Why isn't this used in turbo fan engines to have a contrarotating fan? $\endgroup$
    – SRawes
    Commented Apr 3, 2017 at 16:55
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    $\begingroup$ They have used counter-rotating blades on aircraft (see link below) and steam turbines use fixed blades that fit between the moving blades that kind-of do the same thing by forcing the steam to hit the next set of turning blades at an angle that will impart the most kinetic energy. en.wikipedia.org/wiki/Contra-rotating_propellers $\endgroup$
    – Gwydionforge
    Commented Apr 3, 2017 at 16:59

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