this post was submitted on 12 Aug 2023
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I think that the additional weight on the water on the surface of the outer airplane body increases friction with the air, and also weight of the aircraft. But does the fuel consumption increase? And by how much?

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[–] wolfpack86 3 points 1 year ago (2 children)

Rainy days will lower barometric pressure, so perhaps there's a performance drop, but not by virtue of the water on the plane?

[–] [email protected] 4 points 1 year ago* (last edited 1 year ago)

We do account for barometric pressure, but it's generally a few tens of feet. So yeah, a teeny tiny bit, though you can have low barometric pressure without rain.

[–] [email protected] 1 points 1 year ago (2 children)

Plus any raindrops being sent through the engine will weigh more than normal air

[–] [email protected] 3 points 1 year ago

Sorry I wasn't clear, it's the density of oxygen in the air. Rain will reduce that number, but by an immeasurably small amount.