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Post by fireballxl5 on Jul 20, 2009 21:25:08 GMT -4
This guy has been posting the message below all over the Icke forum on every thread regarding Apollo. Hes just so smug i would love to see someone really take him down a peg or 2.
Here's what hes saying:
Hes posted the same thing on so many threads it would be fun to see him get hit with some real science. I know the basics but to see the guy get properly worked over would be funny.
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Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Jul 20, 2009 21:33:06 GMT -4
First, how can one see the depth of the LM footprint while the footpad is still there?
Second, the boot prints really aren't all that deep.
Third, the pressure applied by an astronaut's foot is about the same as that apply by the footpads. It is not weight that matters, it is weight per unit area.
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Post by gonehollywood on Jul 20, 2009 21:33:46 GMT -4
How can a footprint be left when the actual object still rests in place? If you move the object then you will see its footprint. What? Really? No way?
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Post by BertL on Jul 20, 2009 21:40:42 GMT -4
Also remember that when the LM still landed, the engine was still blowing dust to all sides. Putting your footprint in dust that flies everywhere is kind of hard.
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Post by fireballxl5 on Jul 20, 2009 21:56:35 GMT -4
There's so many threads about Apollo over there that are such trash science and research i would pay to see some of you guys sign up and give them a few lessons, and learn a lot myself.
BTW I'm not a reptilian spam bot for David icke.
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Post by laurel on Jul 20, 2009 21:58:44 GMT -4
But isn't that what you'd say if you were a reptilian spam bot for David Icke ... ?  |
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Post by gonehollywood on Jul 20, 2009 22:01:27 GMT -4
Oh laurel, kudos. That was great.
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Post by LunarOrbit on Jul 20, 2009 22:05:06 GMT -4
I'm no mathematician, but I understand that having the weight of the LM distributed over four widely spaced legs and large "feet" probably makes a difference.
Also, notice how the contact probe is bent out horizontal (it began in a vertical position) and is in a deep trench? Doesn't that indicate a thing or two about the way the LM got in that spot?
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Post by fireballxl5 on Jul 20, 2009 22:08:40 GMT -4
But isn't that what you'd say if you were a reptilian spam bot for David Icke ... ? ;D  Nice If i was why would i be asking the Wisdom of this forum to descend on the son of god, sorry David Ickes forum and expose people for the twits they are I mean that in a joking way Sometimes my jokes dont ok well with my poor English. |
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Post by fireballxl5 on Jul 20, 2009 22:12:34 GMT -4
As a foot note. Im sure reptilians are one of ickes enemy's and wouldn't work for him. Or would they?  ?? Its a conspiracy Ickes a reppie. |
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Post by pzkpfw on Jul 20, 2009 22:27:29 GMT -4
Darn it I wish my memory were better.
I was watching a documentary on a particular armoured vehicle the other day (may have been the Chaffee light tank, or perhaps the M113 APC), and it was pointed out that the ground pressure from this thing was less than a soldier in a boot.
([Weight of vehicle divided by area of tracks on ground] versus [weight of soldier divided by area of soles of boots]).
Thus the thing was liked very much for its' ability to cross marshy areas.
Would be a very nice illustration - if I could remember the details...
(Eeep, may even have been the British APC used in the Falklands... will search tonight)
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Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Jul 20, 2009 23:23:29 GMT -4
The Apollo 11 lunar module had a mass of 33,278 lbm. During descent the LM burned 17,414 lbm of propellant, leaving a surface mass of 15,864. In lunar gravity the LM's weight was 2,626 lbf. The LM had four 37-inch diameter footpads, giving a total contact area of 4,301 square inches. Therefore, the average ground pressure was
2,626 / 4,301 = 0.61 PSI
Armstrong and Aldrin each weighed around 165-170 pounds, while the mass of the complete EMU was 183 lbm. Fully suited, each astronaut had a mass of about 350 lbm or, in lunar gravity, a weight of 58 lbf.
I don't have a lunar boot to examine, but I do have a slip-over rubber boot that looks to be about the same size as an Apollo over-boot. I measured and estimated the contact area of a single boot to be about 53 square inches. If an astronaut is standing flat-footed on one foot, the ground pressure is approximately
58 / 53 = 1.1 PSI
In conclusion, an astronaut exerts a pressure about 80% greater than the lunar module.
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Post by randombloke on Jul 21, 2009 9:26:01 GMT -4
So, in summary:
1. What footprint? I see a foot. Move the LM and we might get a better idea of how deep the impression is.
2. See that gold stick-thing out the side there? That's a couple inches wide and buried completely. How deep do you have to make an impression before you bury a two-inch tube?
3. If you actually bother to do any of the math, you will find that the astronauts exerted more ground-pressure than the LM because they were standing on much smaller feet.
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Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Jul 21, 2009 10:05:04 GMT -4
Here’s another hypothesis to ponder:
The surface was scoured by the engine exhaust before the footpads touched down. This blew away much of the loose top layer leaving the pads without much material to make an impression. As it looks like this area experienced quite a bit of back-and-forth foot traffic, the astronauts likely churned up fresh material. The newly generated loose material was then available to leave boot impressions.
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Post by echnaton on Jul 21, 2009 11:22:05 GMT -4
The initial pressure of foot fall was not evenly spread around, but concentrated by the boots tread into a much smaller area. It is only when the whole boot makes contact that the compaction stops and the astronauts weight is supported. The LM pads, on the other hand were mostly flat and supported the weight uniformly. The actual compaction underneath cannot be observed.
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Nice
