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Hypersonic model test in the 8-Foot High Temperature Tunnel at NASA Langley.
Control room of the 8-Foot High Temperature Tunnel.
Hat Monocoque in the 8-Foot High Temperature Tunnel.

8-Foot High-Temperature Tunnel Facility

The 8-Foot High Temperature Tunnel (HTT) provides combustion-heated hypersonic blowdown-to-atmosphere simulation for Mach numbers of 3, 4, 5, and 6.5 through a range of altitude from 50,000 to 120,000 feet.

Learn More About 8-Foot High-Temperature Tunnel about 8-Foot High-Temperature Tunnel Facility

Focus Areas and Capabilities

Learn more about the specifications and capabilities of this facility.

Large scale scramjet in the 8-Foot High Temperature Tunnel.


The facility test stream is produced by burning methane, air, and liquid oxygen and expanding the combustion products through any one of several nozzles in to the test section.

NASA workers placing Ray H. Wright into a diving suit.

Quick Facts

It has an array of test support systems: hydrogen system, silane system, JP–7/JP–10 systems, ethylene system, model hydraulic system, water cooling systems, and nitrogen purge systems.

A NASA technician working on the Methane Spray bar.

Data Acquisition

The facility currently provides testing capability at Mach 3, 4, 5, and 6.5. The test section accommodates very large (5 by 9 ft) thermal protection system models.

Contact Information

8-Foot High Temperature Tunnel
Facility Manager: Aaron Fuchs
(757) 864-2878

NASA Langley Research Center
Hampton, VA 23681
(757) 864-1000

Fact Sheet

The 8-Foot High-Temperature Tunnel (HTT) is the nation’s largest hypersonic blow down test facility.

The facility supports large-scale thermal protection system testing, flight qualification testing, and hypersonic engine testing. The HTT duplicates as near as possible, the flight conditions that would be encountered by hypersonic vehicles in the atmosphere.

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X-43 model in NASA Langley wind tunnel
NASA Langley tested versions of the X-43 engine before it established the Guinness World record for fastest air breathing hypersonic vehicle – reaching a speed of almost Mach 10.