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originally posted by: choos
originally posted by: MerkabaMeditation
originally posted by: JustMike
a reply to: MerkabaMeditation
In the last paragraph of your post, you link to a 6.2 MB .pdf file that is a detailed report from a Design Panel that investigated the failure of a pressure vessel on the Apollo 13 spacecraft. As the report is 102 pages long, could you please advise which page contains the measurement data for the "Apollo walls" that you have stated? (ie, "0.015 to 0.025 inches thick aluminum".)
Thank you.
Page 21, Table D3-I (page 24-25) which describes I believe describe thickness of the welds, and page 26:
-MM
scroll up a bit to page D-13 and find this heading:
STRUCTURAL EVALUATION OF THE OXYGEN TANK
the oxygen tanks wall is NOT the command modules wall..
Outer shell...The wall thickness of the outer shell is 0.020 ± 0.002 inch.
originally posted by: MerkabaMeditation
originally posted by: choos
originally posted by: MerkabaMeditation
originally posted by: JustMike
a reply to: MerkabaMeditation
In the last paragraph of your post, you link to a 6.2 MB .pdf file that is a detailed report from a Design Panel that investigated the failure of a pressure vessel on the Apollo 13 spacecraft. As the report is 102 pages long, could you please advise which page contains the measurement data for the "Apollo walls" that you have stated? (ie, "0.015 to 0.025 inches thick aluminum".)
Thank you.
Page 21, Table D3-I (page 24-25) which describes I believe describe thickness of the welds, and page 26:
-MM
scroll up a bit to page D-13 and find this heading:
STRUCTURAL EVALUATION OF THE OXYGEN TANK
the oxygen tanks wall is NOT the command modules wall..
And on page 26 it says
Outer shell...The wall thickness of the outer shell is 0.020 ± 0.002 inch.
-MM
Needless to say this is a very Simplistic Statement. Yes, there is deadly radiation in the Van Allen belts, but the nature of that radiation was known to the Apollo engineers and they were able to make suitable preparations. The principle danger of the Van Allen belts is high-energy protons, which are not that difficult to shield against. And the Apollo navigators plotted a course through the thinnest parts of the belts and arranged for the spacecraft to pass through them quickly, limiting the exposure!!!
The cryogenic storage and fuel cell subsystems are located in bay 4 of the service module (SM).
originally posted by: Zaphod58
a reply to: GrandCourtJester
Uhm, no. It's been high security because of all the classified aircraft that test there.
originally posted by: Zaphod58
a reply to: GrandCourtJester
Uh huh. And yet, none of the terrain around there matches up to what was seen on the moon.
Polyethylene is radiation shielding? Really? You want to go with that? Oh and just how did they "use low exposure"? What does that even mean? (I assume you want us to believe they just zipped past the VAs at hyper speed)
originally posted by: OccamsRazor04
originally posted by: MerkabaMeditation
Apollo spacecrafts only had a heat shield for rentering the Earths atmosphere which had absolutely no effect when it came to radiation protection for the Apollo crew or computer systems.
More specifically an ablative heat shield that consists of a layer of plastic resin; the outer surface of which is heated to a gas which carries the heat away by convection. Such shields were used on the Mercury, Gemini and Apollo spacecraft.
-MM
They used a combination of speed, low exposure, and the insulation of the Command Module. It was not ideal, but it was enough. We would not try the same today, and would use polyethylene or something like it. Definitely not lead haha, wow whoever came up with that 6 feet of lead is a funny guy.
an invisible shield some 7,200 miles above Earth that blocks so-called "killer electrons," which whip around the planet at near-light speed and have been known to threaten astronauts, fry satellites and degrade space systems during intense solar storms......The latest mystery revolves around an "extremely sharp" boundary at the inner edge of the outer belt
A cutaway view of ths Apollo Service Module
is shown in Fig. 3. The shell is composed
of 1-in. thick honeycomb panels. Six radial
beams extend inward from the shell to take
shear loads. These beams are a web-stringer
design made from chem-milled aluminum. The
web thickness is 0.018 in. The beams divide
the Service Module into six sectors, four containing
fuel tanks and two containing equipment
shelves. Equipment is also located on forward
and aft bulkheads.
The crew compartment was cylindrical in section in a welded and riveted construction, 92 inches in diameter and 42 inches deep, giving a habitable volume of 160 cubic feet, just sufficient for the two crewmembers to stand side by side. Due to the weight saving programs the compartment skin was reduced to a thickness of 0.012 inches, the equivalent of approximately three layers of kitchen foil. The crew were restrained in a standing position by spring loaded straps to the side of the compartment and its floor.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
Which proves? The insulation and equipment under the skin provided additional shielding. Some types of radiation are quite easily stopped, and more than just the skin provided protection.
originally posted by: JustMike
So, I don't know why you referenced the thickness of a pressure vessel within the SM (where the astronauts never were) in order to support your assertion that the shielding of the CM spacecraft was inadequate.