[CamperBob]

If you have heat from friction you expect the heat along the length of the ship.

How in the world does that follow? Heat from friction will be generated in proportion to cos(angle) between the airflow and the surface at any given point, just like heat from compression would. It will flow along the ship's surface and soak into its interior volume just as if it were generated by compression.

[ars]

Um, air can't flow at an angle to a surface. It can only flow parallel to it.

[CamperBob]

But what's important is the behavior of the airflow at the point where it hits the surface and is forced to both compress and diverge. That's where the majority of the heat is presumably generated, right? Maybe that's where I'm misunderstanding the issue.

[ars]

That heat is created by compression, not by friction.

And I would not automatically say that's where the majority is. Some is created there from compression, some from friction by flowing along the length of the ship.