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ISS Section / Re: Expedition 57 Thread
« Last post by Artyom. on Today at 05:40 AM »
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Also fittings inside the starship like the decks, supports etc

Maybe not
Why would carbon fibre not be a suitable material for decks and supports?
If they use metal for the hull, they may need interior structure compatible with expansion/contraction in contact with hull. Slip joints might not provide enough structural support.

compatible how? the crew compartment needs to remain at human temperatures and therefore is basically immovable, not subject to expansion/contraction as far as the hull is concerned, whether carbon fiber or metal.

Human temperatures are a 100 degree F range though. That is about half an inch of expansion over 9 meters of Aluminum. He is right that carbon fiber shrinking (assuming the fibers are circumferential around the tube) and the aluminum internal structure expanding could be a problem. It may make the structure unusually vulnerable to off nominal thermal stress. That being said, mixing composites and metal structures is of course done on Falcon 9 - at a smaller scale though, and the composite interstage did fail on the recent booster. Whether thermal stress had something to do with that? Not sure.
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ISS Section / Re: VKD-45a Russian Spacewalk (Dec 11th, 2018)
« Last post by Artyom. on Today at 05:37 AM »

Several photos, which were sent by cosmonaut Sergey Prokopyev.


Pictures taken by Alex Gerst.
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Indian Launchers / Re: EMIsat - PSLV C44 - NET January 2019
« Last post by A.K. on Today at 05:34 AM »
In a first, Isro will make dead rocket stage ‘alive’ in space for experiments - TOI
Quote
NEW DELHI: Can a dead rocket in space be anything but debris? Isro believes it might actually be useful. Feted for its frugality and tech savvy, the Indian Space Research Organisation is working on a new technology where it will use the last stage of the PSLV rocket for space experiments. It will perform a technology demonstration of this new system when it launches the PSLV C44 rocket in January.
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Talking to TOI here, Isro chairman K Sivan said, “Normally, the last stage of a PSLV rocket after releasing the primary satellite in space becomes dead and categorised as debris. It remains in the same orbit as that of the released satellite. Now, we are working on a new technology where we will give life to this “dead” last stage of PSLV, also called PS4 stage, for six months after its launch. This rocket stage will double up as a satellite. This will be the most cost-effective way to perform experiments in space as we don’t have to launch a separate rocket for the purpose.” He said that “India is the only country in the world that is working on this new technology”.
Quote
Explaining the technology, the chairman said, “The rocket stage of PSLV C44, which will be carrying a microsat as the primary satellite in January, will be made alive with the help of new systems that will include batteries and solar panel. Even after the primary satellite separates from the PSLV, the last stage of the rocket will remain active and can be used as an experimental platform for new space technologies. Students or space scientists can use this “alive” rocket stage for space experiments for free. They can attach their small experimental module or satellite (micro or nano) in the last stage and can perform experiments in space once the PSLV delivers the primary satellite into its orbit.” He said that Isro “can do the same with the GSLV rocket as well where we can use its last stage as an experimental platform”.
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https://www.teslarati.com/spacex-new-bfr-heat-shield-advancements-nasa-assistance/

Ugh, the basics are correct (ie SpaceX using TUFROC) but whoever wrote this piece is clearly ignorant of shuttle TPS as a number of statements are just false.

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Unlike the fatally fragile carbon-carbon tiles used on the Space Shuttle

Shuttle used Silica ceramic tiles, and Reinforced Carbon-Carbon panels on the nose-cap, chin, and leading edges. They are two separate things....

Anyhow, here is the original Space Act Agreement, would stick to it and not the article

https://www.nasa.gov/saa/domestic/28344_Fully_Executed_Annex_One_SAA2-403419-1.pdf
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Blue Origin / Re: Blue Origin fleet
« Last post by CameronD on Today at 05:33 AM »
Some of us are thinking LPV = Landing Platform Vessel

That would kinda preclude another though wouldn't it?  After all, one vessel hardly makes a fleet..

If true, the next would have to be "LPV Too". :)
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ISS Section / Re: VKD-45a Russian Spacewalk (Dec 11th, 2018)
« Last post by Lewis007 on Today at 05:17 AM »
Picture posed by Anne McClain on Twitter
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VS 20 launch sticker
(Credit: CSG / CNES facebook)
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SpaceX - SSO A - Launching at SLC 4 in Vandenberg AFB

Jay DeShetler
Published on Dec 12, 2018

https://www.youtube.com/watch?v=8De-WOx3FGA?t=001

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