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Blue Origin / Re: Blue Origin's BE-7 engine
« Last post by meekGee on Today at 01:52 am »


Quote from: meekgee
I don't know of such an implementation, so I was wondering.  It's probably for a reason....

There is a very classic implementation on the Saturn V for the F-1 engines:

No,. Not a throat gimbal. Read again.
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Laser or waterjet cutting holes in flat stick is much cheaper than milling something like isogrid in stainless. I think cutting the grid holes in 4mm and then slipping it inside a 4mm outer ring is an interesting idea.

Once time is spent welding it all together, it might be more expensive, warpy, heat weakened etc etc. Seems unlikely, but possible?
If the clearance is a consistent sub millimeter they could use very traditional spot welding equipment needing no filler wire. Always moving to a distant spot for the next weld controls heat buildup. It could be a very clean job - I just don't think that's what they're doing. I expect we'll see the arch like reinforcement and it'll stay open.


FWIW, I don't really know nuffin.
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Historical Spaceflight / Re: CORONA Reconnaissance Satellite
« Last post by catdlr on Today at 01:40 am »
I am going off-topic (somewhat) with another use of the CORONA data used for the Climate Change study.

How the CIA Secretly Spied On Climate Change - The MEDEA Project


The video shows VP Al Gore speaking in front of a CORONA vehicle (actually only part of it is actual hardware and the rest is a mockup). I was at that event in 1995. Found out it was happening and managed to get myself invited. Gore was a smart guy, but he had an odd way of speaking. After being asked a question, he would take a long pause before answering. Somebody I knew joked that it was because he was waiting for the cassette tape with the answer to slide into position.

There were a number of projects to use CORONA and later data for environmental research. That included things like counting penguin populations and whale migrations.

He's older than that, it's probably a jukebox.
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Laser or waterjet cutting holes in flat stick is much cheaper than milling something like isogrid in stainless. I think cutting the grid holes in 4mm and then slipping it inside a 4mm outer ring is an interesting idea.

Once time is spent welding it all together, it might be more expensive, warpy, heat weakened etc etc. Seems unlikely, but possible?
5
Reading that document the issue seems to be over some sort of larger agreement about buying property in the Boca Chica area.  It was just about Novus trying to get information from SpaceX via discovery and written assuming anyone reading it would have a lot of background on the dispute so it wasn't entirely clear what the issue was.
It's pretty straightforward. Novus had tried to flip some other properties to SpaceX at inflated prices. SpaceX agreed to purchasing the other properties but included a "No Further Purchases" provision in the contract. That provision specifies a prohibited area in the Laguna Madre Beach subdivision and Novus would not be permitted to make purchases within 5 miles of the prohibited area. Novus agreed to the contract. SpaceX is now alleging the contract was violated with the purchase of property ID 173643. SpaceX seeks transfer of the property at the price which Novus had paid the prior owner. There is a jury trial set for August 7th.

15.05. UNLAWFUL PRACTICES. (a) Every contract, combination, or conspiracy in restraint of trade or commerce is unlawful. (b) It is unlawful for any person to monopolize, attempt to monopolize, or conspire to monopolize any part of trade or commerce.

https://statutes.capitol.texas.gov/Docs/BC/htm/BC.15.htm#:~:text=15.05.,part%20of%20trade%20or%20commerce.
Thank you for pointing this out. To clarify, I was saying this was "straightforward" in the sense that the argument on SpaceX's side had been laid out succinctly. I was not trying to suggest which side is correct under the law. The link you provided is good reading material but I would leave the interpretation of the law to the courts. I would hope the discussion here does not to devolve into debates over Texas law and I believe that discussion would be outside the scope of this thread.
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Doubt this is the top end of the booster.  How do you affix the grid fins to a holey ring?
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If the perforated section is indeed a 'cage interstage', it would go on the booster, not the ship.
The ship needs the solid section as part of the aft end TPS. In addition, the purpose of a cage interstage is to allow exhaust gas exit during engine startup - perforating the booster interstage gives a nice direct path for gas flow down the forward dome and out the sides, whereas a solid booster interstage and perforated ship aft section channels gas into a pocket around the edge of the booster and then requires it to turn 180 and flow back up against the exhaust flow to reach the perforated ship aft section.
Maybe not.
The SIX arched windows, matchs the six stations for vacuum raptors. Why - to quickly relieve pressure - why -?  TPS on the skirt is not as crucial as on the body of the ship as possibly the skirt could initially be a replaceable item, and so heat damage is of less consequence. But why? For a possible ss abort if the booster is failing. Or even to allow sufficient venting of the interstage for RVac chill down. Both my speculation.

However maybe that's what you meant - you seem to contradict yourself. (edit strikethrough) Sorry if I misunderstood.

EDIT - I get it. This is the interstage - but it stays permanently attached to the top of the booster. Thus it performs the functions above, and doesn't need tiles as it doesn't re-enter.
Bingo! LAS. Maybe a rethink on staging too. Maybe not.


It's 2-3 minutes from launch to staging. SS engine chilldown costs no launch propellant until GSE disconnect and should still be good three minutes later. If I understand what I'm seeing it's two seconds at most from spinup to ignition.


This sucks compared to solids on an abort tower, but the abort tower adds its own set of risks while spinning up and firing the engines to escape adds no risks that weren't already there. The acceleration, even with 9 Raptor 3's is probably less than you want but if ever there was a time for "war emergency power" setting, getting out of Dodge is it. If the exhaust hoses the booster, who cares at this point?


For when things go right, doing the separation flip and burping one center Raptor at as low a thrust as possible as the clamps come loose can both open up the spacing and impart a bit of spin beyond what the newly apportioned angular momentum would provide. Avoiding impingement becomes much easier.


Perfect? No. Good enough? Maybe. It's better than nothing. By the time people launch they'll be on Raptor 4 or 5. Is this a definitive explanation for the cutouts? No, but IMO, it all hangs together.

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Reading that document the issue seems to be over some sort of larger agreement about buying property in the Boca Chica area.  It was just about Novus trying to get information from SpaceX via discovery and written assuming anyone reading it would have a lot of background on the dispute so it wasn't entirely clear what the issue was.
It's pretty straightforward. Novus had tried to flip some other properties to SpaceX at inflated prices. SpaceX agreed to purchasing the other properties but included a "No Further Purchases" provision in the contract. That provision specifies a prohibited area in the Laguna Madre Beach subdivision and Novus would not be permitted to make purchases within 5 miles of the prohibited area. Novus agreed to the contract. SpaceX is now alleging the contract was violated with the purchase of property ID 173643. SpaceX seeks transfer of the property at the price which Novus had paid the prior owner. There is a jury trial set for August 7th.

15.05. UNLAWFUL PRACTICES. (a) Every contract, combination, or conspiracy in restraint of trade or commerce is unlawful. (b) It is unlawful for any person to monopolize, attempt to monopolize, or conspire to monopolize any part of trade or commerce.

https://statutes.capitol.texas.gov/Docs/BC/htm/BC.15.htm#:~:text=15.05.,part%20of%20trade%20or%20commerce.
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Historical Spaceflight / Re: CORONA Reconnaissance Satellite
« Last post by Blackstar on Today at 12:17 am »
I am going off-topic (somewhat) with another use of the CORONA data used for the Climate Change study.

How the CIA Secretly Spied On Climate Change - The MEDEA Project


The video shows VP Al Gore speaking in front of a CORONA vehicle (actually only part of it is actual hardware and the rest is a mockup). I was at that event in 1995. Found out it was happening and managed to get myself invited. Gore was a smart guy, but he had an odd way of speaking. After being asked a question, he would take a long pause before answering. Somebody I knew joked that it was because he was waiting for the cassette tape with the answer to slide into position.

There were a number of projects to use CORONA and later data for environmental research. That included things like counting penguin populations and whale migrations.
10
SpaceX General Section / Re: Starlink : Markets and Marketing
« Last post by Nomadd on 06/01/2023 11:45 pm »
Greek cargo ships appear to be implementing Starlink at a good clip.  But being ecstatic about only 1 GB of free data per week per crewmember makes me wonder about how bad VSAT must be.
Weird. Seems Blue Planet operates large bulk carries which apparently have around 30 crew (according to google). That'd be 30x4x1GB = 120GB. Way less than the 1TB tier.
What's weird? Inmarsat is priced in dollars per megabyte.
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