Electric propulsion engine test chamber

Claim 1

A TESTING FACILITY FOR AN ENGINE WHICH DISCHARGES A GASEOUS HYDROGEN EXHAUST JET COMPRISING A VACUUM TIGHT SHELL, THEREBY FORMING A VACUUM TEST CHAMBER WITHIN WHICH THE ENGINE IS MOUNTED, MEANS IN COMMUNICATION WITH SAID CHAMBER FOR OBTAINING A DESIRED SUBATMOSPHERIC TEST PRESSURE IN SAID CHAMBER, MEANS FOR SELECTIVELY INJECTING GASEOUS OXYGEN INTO THE PATH OF THE HYDROGEN EXHAUST AT A RATE TO PROVIDE A HYDROGEN-OXYGEN MIXTURE HAVING AN EQUIVALENCE RATIO OF NOT MORE THAN PLUS OR MINUS 30 PERCENT FROM A STOICHIOMETRIC RATIO, A CATALYST BED TRANSVERELY DISPOSED WITHIN SAID CHAMBER FOR CONVERTING THE HYDROGEN-OXYGEN MIXTURE INTO WATER VAPOR, SAID CATALYST BED BEING COMPRISED OF PALLADIUM-COATED ALUMINA PELLETS, AND CONDENSING MEANS TRANSVERSELY DISPOSED WITHIN SAID CHAMBER, SAID CONDENSING MEANS BEING COOPLED TO A TEMPERATURE BETWEEN FREEZING POINT OF THE WATER VAPOR AND THE CONDENSATION POINT OF HYDROGEN GAS AT THE TEST PRESSURE TO EFFECT TRANSFORMATION OF THE WATER VAPOR TO ICE.