this post was submitted on 03 Jan 2024
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SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i... (interestingengineering.com)
submitted 10 months ago by L4s@lemmy.world to c/technology@lemmy.world
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SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i...::undefined

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[–] CaptainSpaceman@lemmy.world 11 points 10 months ago* (last edited 10 months ago) (1 children)

The speed of sound is roughly 750mph

This plane goes 4000mph. Thats like Mach 6 right?

Edit: looks like SR71 still holds the record for now at Mach 3.5 or around 2000mph

[–] grue@lemmy.world 8 points 10 months ago (1 children)

Edit: looks like SR71 still holds the record for now

The unclassified record, sure.

[–] CaptainSpaceman@lemmy.world 3 points 10 months ago (1 children)

Can you explain what youre referring to?

[–] grue@lemmy.world 2 points 10 months ago

I don't believe for a second that the Air Force hasn't built something faster than the SR-71 in forty years, but I do believe they wouldn't have told us about it.