Author Topic: New Shepard Discussion Thread  (Read 98912 times)

Offline FutureSpaceTourist

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Re: New Shepard Discussion Thread
« Reply #280 on: 12/08/2023 04:13 pm »
https://twitter.com/thesheetztweetz/status/1733171155761086515

Quote
The Kennedy Space Center Visitor Complex debuts an exhibit that features a replica of Blue Origin's New Shepard capsule:

Online Comga

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Re: New Shepard Discussion Thread
« Reply #281 on: 12/08/2023 09:33 pm »
Non-technical aside:
The third season of Apple TV's "The Morning Show" has a fictional tech billionaire and his rocket.
The guy is a mash-up of Musk and Bezos, but he's more Musk (software background, hands-on with the rocket, tall [John Hamm], dark (enhanced?) hair) than Bezos
but the rocket is clearly New Shephard except:
 They have three kerosene-LOX engines because
   There was a NASA study showing the clear superiority of hydrocarbon fuels over liquid hydrogen for first stages?
   Nah, because Ker-LOX has more photogenic flames and smoke
 One doesn't need any training before flying, or even knowing when you wake up that you will be flying that day.
 The thing in the middle of the capsule looks like a round coffee table, because what else would it be for?
 Passengers cry after the flight.  (What IS it with Shatner?)
And
 They had to increase the diameter of the rocket to match the capsule so it didn't look so darned phalic!
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Online meekGee

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Re: New Shepard Discussion Thread
« Reply #282 on: 12/08/2023 09:57 pm »


...
And
 They had to increase the diameter of the rocket to match the capsule so it didn't look so darned phalic!

You can get that done surgically too, so it doesn't look so much like NS.
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Offline deltaV

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Re: New Shepard Discussion Thread
« Reply #283 on: 12/11/2023 09:58 pm »
but the rocket is clearly New Shephard except:
 They have three kerosene-LOX engines because
   There was a NASA study showing the clear superiority of hydrocarbon fuels over liquid hydrogen for first stages?
   Nah, because Ker-LOX has more photogenic flames and smoke

IIUC it's common wisdom that hydrogen isn't the best choice for first stages. Suborbital rockets are pretty similar to first stages so I'd guess this wisdom applies to them too. I wonder if New Shepard is using hydrogen for some silly marketing reason such as helping them convince ignorant people that they're carbon neutral or making them seem more advanced and trendy.

Offline tbellman

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Re: New Shepard Discussion Thread
« Reply #284 on: 12/11/2023 11:53 pm »
IIUC it's common wisdom that hydrogen isn't the best choice for first stages. Suborbital rockets are pretty similar to first stages so I'd guess this wisdom applies to them too.

The low thrust density of hydrolox is much less of a problem for suborbital rockets like New Shepard.  They need much less delta-v than the first stage of an orbital rocket (they only go up, don't need to provide a lot of horizontal velocity), and they are not carrying a heavy second stage.  Thus the gravity losses doesn't matter as much.

On the other hand, it also means that having high specific impulse isn't very important.  Reaching space suborbitally is relatively easy (compared to going orbital) even with low-ISP propellants like hypergols or solids.

Quote from: deltaV
I wonder if New Shepard is using hydrogen for some silly marketing reason such as helping them convince ignorant people that they're carbon neutral or making them seem more advanced and trendy.

I think it's more likely that they saw hydrolox as the path towards orbital rockets, and for their Moon plans, so starting out with a hydrolox engine on New Shepard meant getting early experience.

Offline JCRM

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Re: New Shepard Discussion Thread
« Reply #285 on: 12/12/2023 11:48 am »

IIUC it's common wisdom that hydrogen isn't the best choice for first stages..

Delta IV, Ariane 5/6, Long March 5 ....

Offline trimeta

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Re: New Shepard Discussion Thread
« Reply #286 on: 12/12/2023 02:15 pm »

IIUC it's common wisdom that hydrogen isn't the best choice for first stages..

Delta IV, Ariane 5/6, Long March 5 ....

The Space Shuttle convinced the world that "large SRBs + hydrolox sustainer" was a good idea. It isn't (aside from maybe maintaining your nation's solid rocket motor capacity in peacetime).

I believe the history of Delta IV is directly tied to the Space Shuttle, explaining its unusual decision to have a hydrolox first stage without the obligatory SRBs. (Optional SRBs != obligatory SRBs.)

New Shepard has neither SRBs nor Shuttle heritage. The only reason it's hydrolox is that Blue Origin wanted to gain expertise in hydrolox, because they anticipated it being used in later projects (where it would be used for upper stages or in-space propulsion).

Online Vultur

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Re: New Shepard Discussion Thread
« Reply #287 on: 02/07/2024 11:46 pm »
Any updates on this? After a successful return to flight in December, I'm surprised there's no next mission publicized...

Offline Robert_the_Doll

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Re: New Shepard Discussion Thread
« Reply #288 on: 02/08/2024 03:01 am »
Various Blue Origin representatives have stated that New Shepard is planning a crewed flight for NS-25 and it will be happening relatively soon.

 For example this SpaceNews article:
https://spacenews.com/blue-origin-touts-capabilities-of-blue-ring-transfer-vehicle/

Quote
"He also said the company will increase the flight rate of New Shepard. That vehicle performed a payload-only flight in December, the first since a launch mishap more than 15 months earlier. A crewed flight, the first since August 2022, will take place “very soon,” he said, but was not more specific."

Online Vultur

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Re: New Shepard Discussion Thread
« Reply #289 on: 02/08/2024 10:19 pm »
Hmm, OK. I hope they genuinely do increase the flight rate.

Offline Robert_the_Doll

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Re: New Shepard Discussion Thread
« Reply #290 on: 02/09/2024 12:45 am »
If we go by past history, the next flight could occur as soon as the end of this month or early next month.
« Last Edit: 02/09/2024 01:38 am by Robert_the_Doll »

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