@ Balex @lemmy.world
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...
Looks like the plan is for it to eventually reach speeds over 4000 mph.
Looks like the plan is for it to eventually reach speeds over 4000 mph.