I am trying to understand whether can there be any correlation between the contra-rotating propellers and the ice accretion over the wing ? For instance, is there any evidence that ice accretion is more in regular propellers when compared to a contra-rotating propeller ?
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$\begingroup$ Welcome to aviation.SE! $\endgroup$– PondlifeCommented Oct 3, 2017 at 18:35
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$\begingroup$ Are you concerned about total accretion alone, or are you concerned about (a)symmetries as well? $\endgroup$– UnrecognizedFallingObjectCommented Oct 4, 2017 at 0:55
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2 Answers
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What are the parameters for icing on the wing?
- temperature
- air humidity
- airspeed / pressure
The rotation direction of the propeller does not effect any of this parameters. Therefore the propellers rotation direction does not affect icing.
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$\begingroup$ This is not true, propeller swirl means the local angle of attack of a wing behind the propeller is affected by the propeller direction and speed. $\endgroup$– foootCommented Nov 3, 2017 at 21:55
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1$\begingroup$ @fooot But it does that with opposite effect on either side of the propeller so when we change the rotation direction the icing may be affected locally, but for the plane as a whole the local changes level out each other. $\endgroup$ Commented Nov 4, 2017 at 10:42
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I have not seen any engineering study or even theoritical discussion on this topic. However I can from practical experience say contra rotating props appear to have the same propensity to ice as non contra rotating props.
