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I was looking at this picture of an Ilyushin IL-18 turboprop aircraft IL-18 view
Image hosted at https://i2.cdn.turner.com/cnnnext/dam/assets/160630220221-north-korea-air-koryo-il-18-nose-super-169.jpg
and noticed that the outboard engines look significantly smaller than the inboard engines. Wikipedia lists specifications for four identical engines but the outboard cowlings don't seem to have air intakes.

Can anyone explain why?

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  • $\begingroup$ Great question, Howard! You've got the link to your image, can you post the link that lead you there, for attribution purposes? $\endgroup$
    – FreeMan
    Commented Jul 7, 2016 at 13:01

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The inboard cowlings seem to follow a different design structure in order to make room for the landing gear compartment. The air intakes are moved aft on the outboard cowlings.

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    $\begingroup$ I see that now. Good answer! $\endgroup$
    – Howard Miller
    Commented Jul 7, 2016 at 17:39

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