> *can fly subsonic over land and go supersonic over oceans* A supersonic airfra... | Hacker News

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		JumpCrisscross on March 22, 2024 \| parent \| context \| favorite \| on: Boom announces successful flight of XB-1 demonstra... > can fly subsonic over land and go supersonic over oceans A supersonic airframe is typically inefficient at subsonic speeds.

AnimalMuppet on March 22, 2024 | [–]

1. If you're flying supersonically, you probably aren't worried about efficiency anyway.

2. If you're flying NYC-London or LAX-Tokyo, the portion you spend over land isn't a big contributor to the overall efficiency.

wrsh07 on March 22, 2024 | [–]

I think boom is aware of this and is planning to make their planes efficient at 90% speed of sound

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