It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by ppk55
Here's the transcript history.nasa.gov...
[atsimg]http://files.abovetopsecret.com/images/member/89743f277149.jpg[/atsimg]
Originally posted by CHRLZ
Originally posted by Tomblvd
IOW, all the dust was pushed out sideways from underneath the LM. There was no way for dust, soil or rocks to get up and into the top of the pads while the LM was yet to touch the surface.
Originally posted by CHRLZ
Originally posted by Tomblvd
1. NO AIR.
In an atmosphere, the exhaust gases of a landing, descending jet/rocket engine mix in with the surrounding atmospheric gases and create a turbulent 'maelstrom' of down-, side- and up-drafts. Those air movements will puff the dust upwards.
In a vacuum, the ONLY thing that can move a particle, is another one hitting it!. That can ONLY be either:
- molecules of exhaust gas/combustion products (but there wasn't much (in fact, by then, none - see item 2!!) as it was 1/6 gravity, andthe gases dissipate very rapidly in a vacuum.
history.nasa.gov...
An example was the installation of frangible probes on the base of each foot pad to tell the crew the lander was a meter and a half above the surface and to switch off the descent motor. If the motor were still firing when the craft touched down, the engine nozzle would be damaged, landing stability might be affected, and the ascent stage might be impaired by debris kicked up by the engine exhaust.13
Another factor that influenced the landing-performance analysis was the desire of the Apollo 11 (LM-5) crewmen to have the option of thrusting the descent engine until the footpads had touched down, rather than initiating engine shutdown following lunar- surface-probe contact. This option resulted in additional analysis, and statistical re- sults were obtained for both the "probe" mode and the "pad"mode type of LM landing,
The probe mode is the primary procedure for LM touchdown and consists of descent-engine shutdown initiation follow- ing probe contact but before footpad contact. The pad mode is considered a backup landing mode in which engine thrust is terminated following footpad contact.
Originally posted by CHRLZ
Originally posted by Tomblvd
But there's another HUGE factor here!!!
2. The engine ISN"T ON as the lander touches down anyway!
The astronauts shut down the engine as the contact probes hit the surface, or very soon after, and the lander simply fell the last metre or so. In 1/6 gravity, that is a perfectly sensible thing to do - the *inertia* of the craft plus the weak gravity, means it falls quite gently and slowly. That's how the LM was ENGINEERED to land.
So even if there was some mechanism that would 'billow' the dust upwards, and there ISN'T, the engines had stopped a couple seconds earlier anyway.
"The paint on the Surveyor camera shroud was fractured in a mud-cracking pattern," Metzger told SPACE.com. "Each intersection of cracks was at the location where a tiny particle had impacted, drilling a tiny cylindrical hole down into the paint and causing the fractures to spread out from there like spider-legs in a car windshield."
The particles that caused this damage are estimated to have been traveling at around 1,300 feet per second. The figure which ties in well with the expected velocity of particles blasted across the lunar surface by the LM engine just before touchdown. (Bullets exit a rifle at between 600 and 5,000 feet per second, or 180 and 1,500 meters per second.)
Originally posted by FoosM
Another point is, in order for the regolith to even travel it would have to elevate above the ground. If it didnt, if it rolled across the ground, we should have seen radiating lines emanating from below the LM. Where is there evidence of soil displacement and build up in the photographic record or in the videos?
no soil disturbance.
Originally posted by jra
Originally posted by FoosM
Another point is, in order for the regolith to even travel it would have to elevate above the ground. If it didnt, if it rolled across the ground, we should have seen radiating lines emanating from below the LM. Where is there evidence of soil displacement and build up in the photographic record or in the videos?
no soil disturbance.
I just love how you used the worst photo you could find. Do you seriously expect to see anything in a 396 × 473 image taken ~5m away from the LM? You could at the very least, pretend to put a bit of effort in your image searches.
But then you might have stumbled across images like this, that show that the regolith was blown out radially from under the LM. And we all know you don't want that.
AS11-40-5858
AS11-40-5920
AS11-40-5921
Here is a link to the 16mm DAC footage of Apollo 11 LM landing, for anyone who hasn't seen it.
vimeo.com...
Originally posted by FoosM
So why does NASA disagree with you?
history.nasa.gov...
An example was the installation of frangible probes on the base of each foot pad to tell the crew the lander was a meter and a half above the surface and to switch off the descent motor. If the motor were still firing when the craft touched down, the engine nozzle would be damaged, landing stability might be affected, and the ascent stage might be impaired by debris kicked up by the engine exhaust.13
debris kicked up by the engine exhaust
debris kicked up by the engine exhaust
13. Richard Reid, "Simulation and Evaluation of Landing Gear Probe for Sensing Engine Cutoff Altitude During Landing," Internal Note MSC-IN-65-EG-10, 15 March 1965; MSC Quarterly Activity Report for Assoc. Admin., OMSF, NASA, for period ending 30 April 1965, pp. 67-68; Grumman Reports no. 30, LPR-10-46, 10 Aug., p. 18, and no. 33, LPR-10-49, 10 Nov. 1965, p. 15.
Originally posted by FoosM
Another factor that influenced the landing-performance analysis was the desire of the Apollo 11 (LM-5) [...]
The contradictions within NASA is mind boggling.
Originally posted by ppk55
reply to post by MacAnkka
Welcome MacAnkka, wow it's amazing. You have such a similar posting style to CHRLZ. For your very first post on ATS it's almost uncanny.
Aldrin stated he saw dust being picked up some 40 feet in the air (did it billow?).
And all the way down till after touchdown we can see regolith being displaced.
So there was enough soil below them to create a crater.
Originally posted by weedwhacker
reply to post by MacAnkka
Well, notwithstanding your initially rude greeting, I am happy to have you aboard, MacAnkka!
(You're an Aussie? I have a soft spot in my heart for Aussies, anyway...oops, did I say that out loud??)
Originally posted by Tomblvd
Originally posted by FoosM
Originally posted by Tomblvd
2. How could the astronauts know what to expect in terms of lighting? Its not like they had been on the moon before.
We had unmanned landers on the surface taking pictures before Apollo. Also, it isn't hard to measure the amount of light on the moon's surface by telescope.
------
I'm speechless.
I'm still waiting for an answer to this. Why are you "speechless"? What specifically is wrong with that statement?
I'm not going to let you ignore this, I'll keep reposting it until I get an answer.
Originally posted by zvezdar
lol, you asked for evidence of regolith displacment and when shown you reckon it was just swept with a broom.
Once again, i suggest you review the meaning of "cognitive dissonance" and consider how it applies to you:
en.wikipedia.org...
PS: the layer of regolith is generally only a couple of cm's thick, and under that is much harder ground. You can see in the images that much of the regolith has been displaced. Why again would you expect to see a large impact crater?
The crewmen reported no sensation of toppling instability during touchdown. A postflight simulation of the landing dynamics indicated a maximum footpad penetration of 0.5 to 1.5 inches and a footpad slide distance of 18 to 22 inches.
Originally posted by weedwhacker
reply to post by FoosM
Once again, FoosM, amongst ALL of the most incredible, and incorrect, assertions you make (which time, and time again are thoroughly explained) you come up with this gem, that totally misinterprets the facts!!!
Aldrin stated he saw dust being picked up some 40 feet in the air (did it billow?).
See how you did that? (And, does everyone else see, and understand what he/she did, just there?)
So, Aldrin comments that he sees dust, when the radar altitude still reads 40 feet above the surface. THIS DOES NOT mean that the dust was "billowing" up to their altitude!!! How in the heck you came up with that interpretation is beyond belief!
The phrase 'picking up some dust' doesn't mean the dust is actually 'picking up'! Has no one ever heard the term in the sense that Buzz meant? 'picking up' is exactly the same as 'beginning to see some' dust. 'picking up' its movement...that is all.
[edit on 8 June 2010 by weedwhacker]