Hello,

Currently the thermal turbojet and ramjet don't let you use LH2 or liquid fuel, but they do let you use LH4, liquid CO2, etc? AM I doing something wrong here? The crusader doesn't seem to have this problem. See below for the selection of fuels that I have access to for the ramjet. I am using the latest build. Thanks for your input.

this is intended. At high temperatures, propellants and heat exchanger become reactive. To prevent this, a coating is used. However, the coating can only be anti reducing or anti-oxidizing. In order to function in an oxygen-rich atmosphere, it need to use an anti-oxidizing coating, As a consequence, it cannot use any reducing propellants like hydrogen.

this is intended. At high temperatures, propellants and heat exchanger become reactive. To prevent this, a coating is used. However, the coating can only be anti reducing or anti-oxidizing. In order to function in an oxygen-rich atmosphere, it need to use an anti-oxidizing coating, As a consequence, it cannot use any reducing propellants like hydrogen.

thanks that makes sense.