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...::undefined

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[–] LilDumpy@lemmy.world 15 points 10 months ago* (last edited 10 months ago) (4 children)

Why does it take one year for this plane to warm up before it breaks the sound barrier? Aren't there planes that already break the sound barrier in minutes/seconds and not take years?

[–] 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.

[–] Tylerdurdon@lemmy.world 10 points 10 months ago

I think the speed is more in regard to the capability to go into space. From what I remember, the SR71 was easily fast enough to go, but the limit was atmosphere (engines). If they could get something into space that could come back as a single unit (needing just a refuel), it could change a lot. Total speculation though, it's probably just super fast so it can go destroy other humans super good, because that's super important.

[–] Person264@lemmings.world 3 points 10 months ago

They'll test it on the ground and flying slowly first before going fast to make sure it's safe enough.

[–] Munkisquisher@lemmy.nz 3 points 10 months ago

It takes lots of chops with an axe to break through