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In my experience with general aviation twin-engine turboprops I've never heard of one with counter rotating propellors. I've never seen any data about an engine manufacturer building left-rotating turboprop engines.

I'm also curious if any counter rotating twin-engine turboprop aircraft exist outside general aviation as well.

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The only aircraft with turboprop counter rotating propellers that I can think of is the Piaggio P 180 Avanti, whose design is unusual in so many ways.

Check out http://www.mpa.piaggioaerospace.it/, which gives the specifications of a Maritime Patrol Aircraft(MPA) based on the P 180.

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  • $\begingroup$ Interesting! I didn't know the P.180 has counter rotating props. Thanks for that. $\endgroup$ – ryan1618 Aug 13 '15 at 1:40
  • $\begingroup$ I wonder how they achieve the left hand rotation. Is it reversed by the gearbox or is the whole engine built reversed? $\endgroup$ – ryan1618 Aug 13 '15 at 1:42
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    $\begingroup$ In these cases, only the gearbox is reversed; rebuilding the engine is too complicated and simply not worth it. $\endgroup$ – aeroalias Aug 13 '15 at 1:49
  • $\begingroup$ I wonder if one gear box is heavier than the other. $\endgroup$ – ryan1618 Aug 13 '15 at 1:59
  • $\begingroup$ I too would be interested to know more about the gearbox differences. $\endgroup$ – Pugz Aug 13 '15 at 3:59

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