Would CD change for a cylinder if the

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The discussion centers on the impact of a completely hydrophobic surface compared to normal skin drag on an object with a 7:1 ratio submerged underwater. A hydrophobic surface could significantly reduce drag, enhancing the object's movement efficiency. The difference in drag forces could be particularly pronounced at higher speeds or specific angles of attack. Participants explore the implications of this change on performance and maneuverability. Overall, the transition to a hydrophobic surface could yield notable benefits in aquatic environments.
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If the surface was completely hydrophobic vs normal skin drag? If it changed would it be significant in an object with a 7:1 ratio?

Thank you for your responses!
 
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Vanselena said:
If the surface was completely hydrophobic vs normal skin drag? If it changed would it be significant in an object with a 7:1 ratio?

Thank you for your responses!

Forgot to mention the object would be under water.
 
I am following someone on Youtube who has built a rocket shaped (4 proprllers) drone for the world speed record ... He was having problems with internal heat from electical control gear and battery inside the sealed rocket (about 1kw waste heat) Speed is 500km/hr , I suggested a 4mm hole in the tip of the nose and 8mm hole at rear which should alow sufficient air cooling .. I said this will increase thrust because the air exiting is hotter .. a bit similar to a ram jet ... was I correct...
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