Recent comments in /f/technology

TheAssholeofThanos t1_j7u8oyk wrote

Reply to comment by drawkbox in SpaceX prepares for a massive test this week: Firing all 33 Starship engines at once by upyoars

Alot of what made the N1 dangerous were things that SpaceX has been specifically trying to avoid. The N1s were never actually static fired before launch tests (individual components were tested separately, and it was assumed they would work in accordance). The Superheavy and Starship program has been slowly stepping up their series of static fires. This is also the 2020s, where we dont have to rely on technology like pyrotechnic valves (used because they were lighter) and have massive advances in guidance and metallurgy.

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Elegant_Pressure_984 t1_j7u0bq9 wrote

Reply to Netflix extends crackdown on password sharing to more countries by No-Drawing-6975

> The hit to revenues from the shared accounts

But it’s not a revenue hit: money not made is not a loss. I would love to see the projections they have of how many cancellations they expect to see compared to how many extended accounts. Everyone’s tightening their belts right now, it feels like a wild time to roll this out.

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CeeJayDK t1_j7tum7k wrote

Reply to comment by lapseofreason in SpaceX prepares for a massive test this week: Firing all 33 Starship engines at once by upyoars

See https://www.youtube.com/watch?v=LbH1ZDImaI8 or https://www.youtube.com/watch?v=Owji-ukVt9M

But if I understand it right, the temperatures when you drive a propellant turbine can get so hot they melt or otherwise break the turbine, so to get around this they normally burn the propellant in the preburner in a less optimal way with either too much oxygen or too much fuel.

The full flow engine however does both at the same time using two preburners and two turbines and the combined fuel and oxygen mix that reaches the main combustion chamber is optimal for the best combustion and it's super hot and in a gaseous form which helps it burn even more efficiently.

The downside is that it's probably twice the complexity and it's startup cycle is also very complex and must be managed precisely.

But it gets the most amount of thrust out of the available fuel of any current engine design today with the least amount of heat stress on the turbines - which you could use for added safety .. OR use to push the turbines even more to crazy pressures and more power. SpaceX does the latter.

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