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Operator NASDA
Website At JAXA.jp
Apogee 110 km (68 mi)
Spacecraft properties
Manufacturer Mitsubishi Heavy Industries
Launch mass 1,054 kg (2,324 lb)
Dimensions Length:4.40 m (14.4 ft)
Span:1.36 m (4 ft 6 in)
Height:1.04 m (3 ft 5 in)
Start of mission
Launch date February 11, 1996 (1996-02-11)
Rocket J-I
Launch site LA-N, Tanegashima Space Center
End of mission
Disposal splashed down
recovery failed
Landing date February 11, 1996 (1996-02-11)
Landing site Pacific Ocean near Chichi-jima

HYFLEX (Hypersonic Flight Experiment) was a National Space Development Agency of Japan reentry demonstrator prototype which was launched in 1996 on the only flight of the J-I launcher. It was a successor of OREX and was a precursor for the Japanese space Shuttle HOPE-X.

HYFLEX tested the carbon-carbon heat shielding tiles that were intended to be used on HOPE, as well as having the same body shaping in order to gather data on hypersonic lifting. HYFLEX flew in space at 110 kilometres (68 mi) altitude and succeeded in re-entry, but sank in the Pacific after splashdown before it could be recovered.

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