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Science Forum Index » Space - Shuttle Forum » The Shuttle is a wimp
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| diy-newby |
 Posted: Thu Mar 22, 2007 7:14 am |
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I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache? |
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| James R. Jones |
| Posted: Thu Mar 22, 2007 7:36 am |
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diy-newby wrote:
Quote: I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache?
If you've never had your car beat to pieces or the roof on your house
shredded by a hail storm you are a lucky one. Golf ball sized hailstones
could kill a person hit in the head with them. Apparently you have never
lived in an area that has large hail. |
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| André, PE1PQX |
| Posted: Thu Mar 22, 2007 7:49 am |
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diy-newby beweerde :
Quote: I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache?
You talk about 2 completely different stresses:
A hailstone is stress on a very tiny spot.
Flying super- and hypersonic have a larger surface where the stress is
on.
Example:making a (real!!) deep hole is easier with a drill, than with a
sledge-hammer
André |
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| Jeff Findley |
| Posted: Thu Mar 22, 2007 8:24 am |
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"diy-newby" <asas@asas.com> wrote in message
news:gLCdnSRGW9XQ7p_bnZ2dnUVZ8tmhnZ2d@pipex.net...
Quote: I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache?
The tank itself is made of an aluminum lithium alloy, but it's coated with a
spray on foam insulation. This insulation serves many purposes. Firstly,
it is there to keep the liquid oxygen and liquid hydrogen cold. Secondly,
it's there to prevent ice from forming on the outside of the tank. Thirdly,
it's there to prevent heat, from the aerodynamic heating during flight, from
heating up the tank.
And finally, the insulation is on the outside of the tank for a several
reasons. Firstly, putting it on the outside allows the aluminum-lithium
tank to be made lighter, because the strength of this alloy is higher at
LOX/LH2 temperatures than it is at your typical Florida temperatures.
Secondly, it's on the outside to eliminate any possibility of the insulation
coming loose and getting sucked into the SSME's turbopumps. Thirdly, if
it's on the inside, it can't protect the tank from aerodynamic heating.
And, of course, NASA is very cautious about how they deal with the ET
insulation since it was the root cause of the Columbia disaster.
Jeff
--
"They that can give up essential liberty to obtain a
little temporary safety deserve neither liberty nor
safety"
- B. Franklin, Bartlett's Familiar Quotations (1919) |
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| Guest |
| Posted: Thu Mar 22, 2007 10:07 am |
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On Mar 22, 8:14 am, "diy-newby" <a...@asas.com> wrote:
Quote: I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache?
you're obviously very uneducated about how spaceflight works. Do some
research.. sure you could build a rocket damage-resistent to
anything.. but it'd be so heavy it'd never get off the ground. |
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| Brian Thorn |
| Posted: Thu Mar 22, 2007 12:26 pm |
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On Thu, 22 Mar 2007 07:36:37 -0500, "James R. Jones"
<okieman7@cableone.net> wrote:
Quote: If you've never had your car beat to pieces or the roof on your house
shredded by a hail storm you are a lucky one. Golf ball sized hailstones
could kill a person hit in the head with them. Apparently you have never
lived in an area that has large hail.
Yep, my white 1997 Honda Civic took $5,500 worth of damage (just short
of totalled) from a hailstorm in 2002. It had so many dimples in it
afterwards, it looked like a golf ball.
Brian |
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| Greg D. Moore (Strider) |
| Posted: Thu Mar 22, 2007 7:29 pm |
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"Brian Thorn" <bthorn64@cox.net> wrote in message
news:nte5035dbpmv4ppac2cv9urji4604fkkl8@4ax.com...
Quote: On Thu, 22 Mar 2007 07:36:37 -0500, "James R. Jones"
okieman7@cableone.net> wrote:
If you've never had your car beat to pieces or the roof on your house
shredded by a hail storm you are a lucky one. Golf ball sized hailstones
could kill a person hit in the head with them. Apparently you have never
lived in an area that has large hail.
Yep, my white 1997 Honda Civic took $5,500 worth of damage (just short
of totalled) from a hailstorm in 2002. It had so many dimples in it
afterwards, it looked like a golf ball.
Brian
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| Dr J R Stockton |
| Posted: Fri Mar 23, 2007 2:29 pm |
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In sci.space.shuttle message <1174576050.509221.214850@e65g2000hsc.googl
egroups.com>, Thu, 22 Mar 2007 08:07:30, john2375@hotmail.com posted:
Quote: On Mar 22, 8:14 am, "diy-newby" <a...@asas.com> wrote:
I find it very hard to believe that the shuttle and/or external tank can be
damaged by HAIL. The stress and heat the shuttle/external tank go through
and the violence involved during lift off and HAIL damages it.
Come on. if the external tank made from paper mache?
you're obviously very uneducated about how spaceflight works. Do some
research.. sure you could build a rocket damage-resistent to
anything.. but it'd be so heavy it'd never get off the ground.
Florida weather has been observable for hundreds of years; hail cannot
be all that uncommon.
A conical aluminium sheet ten metres in diameter and three millimetres
thick mounted over the front of the tank would, I guess, deflect all
possible hail and would weigh no more than a tonne. For another tonne
it should be possible to protect all forward-facing parts of the
orbiter, and for another tonne the SRBs.
This "roof" would have no effect on STS performance if it was removed
shortly before launch.
--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME.
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News. |
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| Derek Lyons |
| Posted: Fri Mar 23, 2007 5:37 pm |
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Dr J R Stockton <jrs@merlyn.demon.co.uk> wrote:
Quote: Florida weather has been observable for hundreds of years; hail cannot
be all that uncommon.
Actually it pretty much is. And hail the size of which struck the
Shuttle is extraordinarily uncommon.
D.
--
Touch-twice life. Eat. Drink. Laugh.
-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL |
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