Skylon - Posted In New Technology / Science etc


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April 27, 2018, 05:38:49 AM

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Skylon

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Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

When coming back down from orbital heights, "angular" is more of a drawback than an asset. You don't necessarily want sharp edges that have the potential for generating more heat than the surface of the Sun, after all. Smiley Heat dissipates best in a "lateral" manner, and with sharp(ish) edges, there isn't a whole lot of lateral dissipation.
Posted August 27, 2013, 19:28:48 PM Logged
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Offline DD1975 Topic starter
England Posts: 1598
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I took this from the Encyclopedia Atronautica:

The aeroshell formed the outer surface of the aeroplane and therefore had to withstand the local aerodynamic pressure loads and kinetic heating. The aeroshell was passively radiation cooled and during the ascent rose to a maximum of 855K at the bottom of the dive. During reentry the temperature was kept down to 1100K by dynamically controlling the trajectory via active feedback of measured skin temperatures. This was possible by virtue of the low ballistic coefficient and controllability of a lifting vehicle with active foreplanes. The aeroshell was airtight to prevent reentry gases leaking into and destroying the vehicle interior.

And this from the Wiki:

The currently proposed Skylon model C2 will be a physically large vehicle, with a length of 82 metres (269 ft) and a diameter of 6.3 metres (21 ft).[42] Because it will use a low-density fuel, liquid hydrogen, a great volume is needed to contain enough energy to reach orbit. The propellant is intended to be kept at low pressure to minimise stress; a vehicle that is both large and light has an advantage during atmospheric reentry compared to other vehicles due to a low ballistic coefficient.[43] Because of the low ballistic coefficient, Skylon would be slowed at higher altitudes where the air is thinner. As a result, the skin of the vehicle would only reach 1,100 Kelvin (K).[44] In contrast, the smaller Space Shuttle was heated to 2,000 K on its leading edge, and so employed an extremely heat-resistant but fragile silica thermal protection system. The Skylon design does not require such a system, instead opting for using a far thinner yet durable reinforced ceramic skin.[2] However, due to turbulent flow around the wings during re-entry, some parts of Skylon would need to be actively cooled.[41]

Posted August 28, 2013, 21:41:35 PM Logged
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Offline Snowcrash
England Global Moderator
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Very interesting.

Must keep reminding myself to check on the things I think I know.  Shocked
Posted August 29, 2013, 15:23:19 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

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Offline DD1975 Topic starter
England Posts: 1598
Rank: Certified

I was questioning it too snowy, however i decided that as the guys who came up with it ARE rocket scientists that they must have some idea of what they were doing  Grin
Posted August 29, 2013, 18:55:18 PM Logged
Smoke me a Kipper I'll be back for breakfast - Ace Rimmer

Offline sybershot
United States WWW Posts: 1443
Rank: Certified

naaa!!!! there just winging it, and if it works - there praised - if not - here fired - lol just joking  Tongue
Posted September 10, 2013, 12:37:21 PM Logged

Offline DD1975 Topic starter
England Posts: 1598
Rank: Certified

Good article on Skylon here.

http://www.bbc.com/news/science-environment-27591432

Disclaimer: Yes I know its BBC.com Data, sorry  lol

EDIT
It bounced me to this page
http://www.bbc.co.uk/news/science-environment-27591432
Posted June 05, 2014, 15:29:43 PM
Last Edit: June 05, 2014, 17:30:38 PM by Snowcrash
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Offline DD1975 Topic starter
England Posts: 1598
Rank: Certified

Been very quiet on this front for a while, new update:

http://www.bbc.co.uk/news/science-environment-43732035

Posted April 12, 2018, 13:20:35 PM Logged
Smoke me a Kipper I'll be back for breakfast - Ace Rimmer

Offline Data
United Kingdom Administrator
Posts: 4980
Rank: Certified

Nice to see they are still working on this, does seem to be taking a while to get there but all good things come to those that wait  Smiley
Posted April 13, 2018, 12:26:40 PM Logged

Offline DD1975 Topic starter
England Posts: 1598
Rank: Certified

Only around 30 years or so data  Wink

However when you also take this recent piece of news into account:

https://www.theengineer.co.uk/uk-spaceports-space/

Things seem to be slowly coming together

Posted April 13, 2018, 15:48:58 PM Logged
Smoke me a Kipper I'll be back for breakfast - Ace Rimmer
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