Hypersonic Flight Experiment
![Model of RLV-TD launch arrangement](/Images/godic/202501/19/AvatarTD1109.JPG"){kind=avatar}
Hypersonic Flight Experiment or HEX is planned to be the first test flight in the RLV-TD development program. The demonstration trials will pave the way for a Two-Stage-To-Orbit (TSTO) fully re-usable launch vehicle. HEX is scheduled for May 2016.