Ask HN: Why can't jets use a rocket engine like Raptor?

Re:Ask HN: Why can't jets use a rocket engine like Raptor? by cylinder714 on Monday October 02, 2023 @10:01PM (#37747046)

Jets fly in the atmosphere, and they use air to burn fuel. Rockets fly outside the atmosphere, so they have to carry oxidizer with them. Rocket planes have existed, but because the have to carry both elements to function, they're limited in how much payload they can carry and how far they can go.

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Re:Ask HN: Why can't jets use a rocket engine like Raptor? by starbase on Monday October 02, 2023 @10:22PM (#37747163)

In addition, jets (specifically turbofans) use air as reaction mass. This multiplies their efficiency severalfold.

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Re:Ask HN: Why can't jets use a rocket engine like Raptor? by keepamovin on Monday October 02, 2023 @10:42PM (#37747329)

Because they're pushing stuff out that they don't have to carry? So it's like the get the thrust without the extra weight of the air?

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