00:00LH2 and LOX were used for decades in the Saturn V, the Space Shuttle and Ariane 5.
00:08That means the technology is well proven. Blue Origin has also spent the last 25 years
00:14mastering the handling of liquid hydrogen. The downsides of hydrogen and why SpaceX is avoiding
00:19it. In practice, hydrogen is an engineer's nightmare. An extremely low temperature of minus
00:25253 degrees Celsius. Hydrogen is the coldest cryogenic fuel which makes it hard to store.
00:32It evaporates easily, needs constant cooling and requires highly complex insulation systems.
00:39Highly explosive and permeates almost everything. Hydrogen molecules are so tiny that they can
00:45diffuse through metal structures and cause leaks. Even tiny leaks lead to dangerous explosions.
00:52Because hydrogen is so low in density, you need very large tanks. That makes upper stages heavier
00:59and bulkier increasing aerodynamic drag losses during flight.
01:04for a certain tuning shot.
01:06receiving阻orium
01:06that means disregarding the overlapping amount of damage previous Yo LH2 that means
01:07freaking失ervice on so-called AFive a signal-controlled faith.
01:08Can you sleep inorsumiş?
01:08What are you going for?
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