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22 Dec 2024, 07:40 [ UTC - 5; DST ]


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 Post subject: Re: Spacex Starship OFT
PostPosted: 20 Nov 2024, 12:22 
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Those of you with kids, they’ll probably grow up in a way of life where Space Tourism is a way of life.

Pretty wild.

Another reason to teach them to be pilots.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 20 Nov 2024, 15:01 
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In orbit travel plaza?
Orbit the Earth?
Really?
Wow!

What is so surprising?

We already have space station up there.
We ship supplies up there 3-4 times a year,
We shuttle people up and down 4-5 times a year,
Heck, we already ship tourists up and down (Axiom)

all we need is scale.

With Starship cost of launch in 2-3mln/launch range (~800k for propelant and ~2mln for hardware) and capacity to shuttle 100 people/time it comes down to $20-30k/seat. Jumpseats (small crew space on otherwise cargo missions) should be even cheaper.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 14:25 
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Hmm, then it is overbuilt. :D

Exactly my thoughts. I'm expecting they will push to failure on one of the next flights.

The exceedence was pitch attitude. They had models that indicated that they could go to a slightly negative pitch angle and still recover and land. If it couldn’t, it would have belly flopped into the water. But it could, and did.

It wasn’t a strength issue.
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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 14:31 
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I thought it was interesting that on the Starship,
only the 3 center engines of the 33 total engines gimballed,
and on the Saturn V, only the center engine of the 5 gimballed.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 15:34 
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I thought it was interesting that on the Starship,
only the 3 center engines of the 33 total engines gimballed,
and on the Saturn V, only the center engine of the 5 gimballed.

There is way more gimballing than just the 3:

https://youtu.be/gY-UbmBpxAo?si=BfgyCfhuczcDFEir&t=20

the middle ring moves as well, the outside ring is stationary.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 16:08 
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Wow, thank you for that!
That is so cool.
and they went from hydraulics to electricity for weight.

I still can't get gimballing straight in my mind,
the amount of power required to move a nozzle,
it hurts to even think about it.

Thanks again.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 18:49 
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I would think a challenge of all the gimbaling to steer and maintain attitude is probably the risk of overcontrolling. By limiting the number of engines that gimbal they probably have more than enough authority and reduced risk of overcontrol.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 18:50 
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I would think a challenge of all the gimbaling to steer and maintain attitude is probably the risk of overcontrolling. By limiting the number of engines that gimbal they probably have more than enough authority and reduced risk of overcontrol.

Also less complexity and weight. The best part is no part.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 18:51 
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I would think a challenge of all the gimbaling to steer and maintain attitude is probably the risk of overcontrolling. By limiting the number of engines that gimbal they probably have more than enough authority and reduced risk of overcontrol.

The outside engines are never used again except for initial ascent, there is zero need to wast several thousand pounds for the gimballing hardware for engines that don't need that.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 22:02 
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I still can't get gimballing straight in my mind,
the amount of power required to move a nozzle,
it hurts to even think about it.


If the pivot point is well located the force required to move the nozzle would mostly be due to friction in the actuators. Of course with 280 tons of thrust that friction might be significant.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 23:40 
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Great picture.


Please login or Register for a free account via the link in the red bar above to download files.


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 Post subject: Re: Spacex Starship OFT
PostPosted: 21 Nov 2024, 23:54 
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Do a close up and look at the engines,
inside the thrust chambers (nozzles).
Some of the injector plates look different,
like some are burning differently.

Hmph.


And I'm so used to seeing "tail feathers" on rockets...


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 Post subject: Re: Spacex Starship OFT
PostPosted: 22 Nov 2024, 00:02 
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Username Protected wrote:
Do a close up and look at the engines,
inside the thrust chambers (nozzles).
Some of the injector plates look different,
like some are burning differently.

Hmph.


And I'm so used to seeing "tail feathers" on rockets...

I think they all look like a litter of baby Pac-Men, some a bit more ripe than others.

Hmph.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 22 Nov 2024, 08:51 
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Do a close up and look at the engines,
inside the thrust chambers (nozzles).
Some of the injector plates look different,
like some are burning differently.

I see that. Some of the dark spots appear to not be aligned with a nozzle. I’m thinking it’s an optical distortion.

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 Post subject: Re: Spacex Starship OFT
PostPosted: 22 Nov 2024, 08:57 
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You can see the different colors on all the images.
Including in the gimbal test video.
I posted the same question on the curated FB group the other day.
I think the consensus is accumulated run time or slightly different process / material.

Ch4 doesn’t get sooty like RP1 and they run a “pretty high” EGT :)

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