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SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

latimes.com

131–140 of 185 posts

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#131

Earlier quoted context omitted.

SpaceX is still the only company to land a real first-stage booster, and the Falcon Heavy was the largest rocket (in terms of payload capacity) to fly since the Saturn V.

false! The energia and the N-1 flow before and they was more powerful that the Falcon Heavy.

Did the N-1 rocket really "fly"?

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#132
post #34

Earlier quoted context omitted.

The current version of the rocket is called "block 5". Those two boosters weren't block 5 boosters. Presumably the reason to spend resources to get them to safe landing was to learn things that will be useful in future launches; for example, those two boosters had enough ignition fluid to land successfully this time, but the main first stage did not.

That make sense. In that case, wouldn't these boosters be useful in future Falcon Heavy launches? Why can't they be resued?

[deleted]

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#133
post #34

Earlier quoted context omitted.

The current version of the rocket is called "block 5". Those two boosters weren't block 5 boosters. Presumably the reason to spend resources to get them to safe landing was to learn things that will be useful in future launches; for example, those two boosters had enough ignition fluid to land successfully this time, but the main first stage did not.

That make sense. In that case, wouldn't these boosters be useful in future Falcon Heavy launches? Why can't they be resued?

At this point they're historic artifacts worthy of preservation. Retire them to a museum.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#134
post #104
post #74

Earlier quoted context omitted.

They also had to use TEB to re-light after an unstart [1]. I think 15 is abount right but it seems like a very small margin to deal with considering how common unstarts were. [1]: https://en.wikipedia.org/wiki/Unstart

I've read about unstarts before and never got the impression that the engine in question stopped. It was the shockwave configuration at the inlet that had to be "restarted"?

Yes I believe that is correct but one consequence of an intake unstart in a J58 is that the afterburner will also stop functioning. I'm not sure what the proper term is when an afterburner stops producing thrust. Maybe flame out?

Regardless, this was the cause of the violent yaw/roll action associated with an unstart (loss of thrust). When the intake was reconfigured the afterburner had to be re-lit and in a J58 this requires TEB. So while TEB was not used to correct the unstart it still had to be used after an unstart.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#135
post #74

Earlier quoted context omitted.

They also had to use TEB to re-light after an unstart [1]. I think 15 is abount right but it seems like a very small margin to deal with considering how common unstarts were. [1]: https://en.wikipedia.org/wiki/Unstart

Once they learned about that they worked around unstarts with software to control the engine spikes to keep the shockwave inside.

Yes, unstarts became less common but they still happened.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#136
post #20

Has anyone seen any updates on how their fairing recovery attempt went? They had the ship done and seemingly ready back in December - https://imgur.com/gallery/MQcEE

Isn't the fairing just a simple pair of metal casings. Why bother to recover it?

Wonder why they dont just leave them in space, could make a good chassis or building block for building bigger space stations

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#137

Earlier quoted context omitted.

SpaceX is still the only company to land a real first-stage booster, and the Falcon Heavy was the largest rocket (in terms of payload capacity) to fly since the Saturn V.

false! The energia and the N-1 flow before and they was more powerful that the Falcon Heavy.

The N-1 never worked properly though. And even one of the two Energia launches was not without issues.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#138

Earlier quoted context omitted.

false! The energia and the N-1 flow before and they was more powerful that the Falcon Heavy.

Did the N-1 rocket really "fly"?

It flew all the way to the scene of the crash.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#139
post #136
post #20

Earlier quoted context omitted.

Isn't the fairing just a simple pair of metal casings. Why bother to recover it?

Wonder why they dont just leave them in space, could make a good chassis or building block for building bigger space stations

First off, they aren't lifted to a stable orbit, that'd cost additional fuel (which'd need more fuel again). They're detached once the air is thin enough that the resistance doesn't cause problems. Secondly, it'd also clutter space further.

Re: SpaceX's Falcon Heavy center booster lacked ignition fluid to re-light engines

#140
post #41

Is that also why the video feed was not working? SpaceX commentators said it was possibly due to vibration.

I don't think any of the boat landings have ever worked live -- only the ones on land.

They've had successful Falcon 9 boat landings....
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