Cheap, easy to handle fuels/oxidizers

However, until someone invests HEAVILY in Lox Valve R&D, it will never be
reliable. Frozen Lox valves are one of the most common causes of vehicle
flight failures in the entire history of rocketry.

If that were so, I wonder why the Air Products plant operating practically
next door to where I live has never had such problems - at least none with
catastrophic effects.

Jan