M11.1 is a test bench for simulating high speed flight inlet conditions for ramjet or scramjet testing and high temperature flows for nozzle testing. It is equipped with a remote controlled chemical H2 / O2 air vitiator with 11 burners that heat pressurized air. The burners are separated into groups, which can be activated independently by the control system to reach a number of burners from 1 to 11. Together with interchangeable sonic orifices in every burner this creates the opportunity to adjust mass flow range and stagnation temperature range to the experimental needs. The air vitiator is designed for a maximum stagnation pressure of 25 bar, a maximum stagnation temperature of 1500 K, and a total mass flow rate of 5.0 kg/s hot gas. It is designed to simulate a Mach 6 high speed flight, but with higher water vapour content in the vitiated air compared to a high altitude flight (due to the H2 / O2 combustion). The maximum possible test duration is about three minutes. The facility can handle ramjet and scramjet combustors and provide a variety of fuels and coolants for them (inert, hydrogen and hydrocarbons as well as experimental fuels). The facility is equipped with a gas sampling interface and measurement equipment for stagnation pressure, static pressure and static temperature, as well as static pressure in the feed lines for oxygen and hydrogen. State of the art optical measurement techniques including background oriented schlieren, highspeed diagnostics, combustion diagnostics and non-intrusive laser measurement methods are applied. This is accompanied by a modern physical-chemical lab for the analysis of gas and fuel samples including hot gas simulation quality measurements.