From 1950s rocket dreams to 2050 hypersonic reality
In short: Imagine traveling from Europe to Australia in just 90 minutes. While the concept of rocket-powered passenger planes dates back to the 1950s, new breakthroughs in hypersonic fluid mechanics are bringing the dream of ultra-fast global travel closer to reality.
The vision of high-speed passenger transport is not new. In the 1950s, Walter Dornberger promoted a concept known as Ultraplane, a two-stage rocket plane designed to use a rocket-boosted skip-glide profile to transport passengers anywhere in the world within a few hours. Decades later, the German Aerospace Center is developing a modern successor: the SpaceLiner. This hypersonic vehicle is designed to carry up to 50 passengers, potentially completing a journey from Europe to Australia in only 90 minutes.
The mechanics of the SpaceLiner involve a two-stage process: a rocket booster for launch and a separate orbiter stage that carries passengers through the upper atmosphere. The vehicle would reach speeds of 24 times the speed of sound before gliding to a landing. While the project aims for full operations by 2050, significant engineering hurdles remain, such as determining the optimal vehicle shape. Furthermore, the cost of such travel would likely be comparable to space tourism, potentially reaching several hundred thousand dollars per seat.
Achieving such speeds requires overcoming the complexities of compressible flow, where air density changes due to pressure and temperature shifts. At extreme speeds, managing heat and turbulence is critical. However, recent laser-based krypton experiments suggest that turbulence at Mach 6 may behave more like slower airflow than previously expected. This supports Morkovin's hypothesis, which suggests that the fundamental pattern of turbulent motion remains relatively consistent even as speeds increase. Such findings could simplify the design of hypersonic vehicles and accelerate the timeline for ultra-fast global travel.
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Sources
- Summary by Intellect · source: Ultraplane - Rocket Passenger Plane
- Also: Hypersonic "SpaceLiner" Aims to Fly Passengers in 2050
- Also: Hypersonic breakthrough could enable planes that fly 10 times the speed of sound
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