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 weedwhacker
(Notes on the video, from the YouTuber):
"Not only has Jarrah made another video that any elementary school kid could debunk, but he has also politely provided us with all the necessary video to prove him wrong. Just like his 'black box' experiment."
"White Noise" !!! That one still makes me
One early concern, though not directly connected with external design, was the firing of the ascent engine while it was still attached to its launch pad, the descent stage. The exhaust blast in the confined space of the interstage structures - called FITH for fire-in-the-hole - could have untoward effects. Some observers feared that the shock of engine ignition might tip the vehicle over. And what would happen if the crew had to abort during descent, shed the descent stage, and return to lunar orbit? This would require extra fuel, posing yet another weight problem. Scale model tests in 1964 allayed these misgivings to some degree, but the real proof had to wait for a firing test in flight of a full-scale vehicle
The ascent engine ignition on top of the descent stage was referred to as a "fire in the hole" or FITH ignition. While it was listed as a requirement to demonstrate the FITH could be done safely and successfully before a landing could be attempted, in actuality Apollo 11 was the first flight during which an actual FITH ignition of the ascent engine was accomplished. (It was not accomplished as planned during the unmanned Apollo 5 test, nor was it attempted during Apollos 9 or 10.)
The Apollo 5 mission tested the Lunar Module in a space environment, in particular its descent and ascent engine systems, and its ability to separate the ascent and descent stages. The descent engine would become the first throttleable rocket engine fired in space.
The mission also performed a "fire in the hole" test—as depicted in the mission's insignia—whereby the engine of the ascent stage would be fired whilst still attached to the descent stage. This would simulate the conditions experienced in an abort during descent to the lunar surface.
So I asked the question, how could you get hotspots on the Ladder and the Astronauts helmet?
Someone said from EARTH.
Initially, I thought the Earth was bright enough to fill in the shadows, but subsequently realized that cannot be the case. The Earth is a fraction of the brightness of the Sun, not nearly enough to fill in the shadows. So then what is that other light source?
Of course he goes on to say the moon itself. But the moon would not create spot like effects on the helmet and ladder. Especially because he states this:
The lunar dust has a peculiar property: it tends to reflect light back in the direction from where it came. So if you were to stand on the Moon and shine a flashlight at the surface, you would see a very bright spot where the light hits the ground, but, oddly, someone standing a bit to the side would hardly see it at all. The light is preferentially reflected back toward the flashlight (and therefore you), and not the person on the side.
www.badastronomy.com...
See? Where did the spot lights come from?
I see briefly a plume.
We'll see how J.W. will respond.
About 215, 000 miles into the voyage, Apollo slows to a speed of around 2, 000 mph due to the decreasing but persistent effects of Earth’s gravity. As Lunar gravity begins to supercede Earth’s gravity, the vehicle begins to accelerate once again. To achieve lunar orbit insertion, Apollo must retrofire (engine facing in the direction of motion) its service module engine to slow the spacecraft to orbital velocity.
Can you imagine sending a men to the moon and not being 110% to being able return back to Earth? Lift-offs have always had their problems to this day!
For that reason, and many others, I call hoax. Because it goes to the theory that there were absolutely too many things that could go wrong to actually attempt the mission. And therefore have 8 missions go to the moon without loss of life is astounding, if not impossible in the 20th century.
I heard once 4000 MPH, and if that is true, I dont see how that one blast off would cause that LM to go 4K mph. So please tell me they had subsequent ignitions to increase speed at least.
Ascent stage
Ascent Propulsion System (APS) engine;
(skip)....
APS propellant mass: 5,187 pounds (2,353 kg)
APS thrust: 3,500 pounds-force (16,000 N)
APS propellants: Aerozine 50 fuel / nitrogen tetroxide oxidizer
APS pressurant: two 6.4-pound (2.9 kg) helium tanks at 3,000 pounds per square inch (21 MPa)
APS specific impulse: 311 sec (3,050 N-sec/kg)
APS delta-V: 7,280 feet per second (2,220 m/s)
Thrust-to-weight ratio at liftoff: 2.124 (in lunar gravity)
Originally posted by weedwhacker
reply to post by FoosM
Again, this deserves another mention, because it illustrates so clearly the problem with the "hoax" believers' perceptions (or lack thereof):
I heard once 4000 MPH, and if that is true, I dont see how that one blast off would cause that LM to go 4K mph. So please tell me they had subsequent ignitions to increase speed at least.
I haven't yet gone to research the actual velocity of the CSM on orbit, I will when I have time. If I can, then you or anyone else can as well, yes??
BUT, let's use the "4000 MPH" figure, for now. Simplifying it, and converting to metric....it is 6,437 kph. Now, assuming even a minimal acceleration, easily tolerable by the astronauts when standing, of ONE G (9.8 meters per second) simple math comes up with a time needed to reach 6,437 kph at that acceleration is 657 seconds. That is 10 minutes, 57 seconds. Just under ELEVEN minutes!!! That assumes constant acceleration....of course, in orbital mechanics, it is important to plan ahead, and time your launch in order to accomplish a rendezvous of that type. Time the acceleration, and angle of trajectory, and time it so that the already orbiting object (the CSM) will be where you expect it to be, when you get there....
Ummm...they WERE rocket scientests, after all...and had practiced such maneuvers from the time of Gemini missions, and knew the math.
The same basic principles apply today, for rocket launches and on-orbit rendezvous at the ISS, or Hubble, or whatever....
Now, I shall toddle off and do some research...rather than trusting it from memory....
~~~~~
Ok, I am back with actual data....
Ascent stage
Ascent Propulsion System (APS) engine;
(skip)....
APS propellant mass: 5,187 pounds (2,353 kg)
APS thrust: 3,500 pounds-force (16,000 N)
APS propellants: Aerozine 50 fuel / nitrogen tetroxide oxidizer
APS pressurant: two 6.4-pound (2.9 kg) helium tanks at 3,000 pounds per square inch (21 MPa)
APS specific impulse: 311 sec (3,050 N-sec/kg)
APS delta-V: 7,280 feet per second (2,220 m/s)
Thrust-to-weight ratio at liftoff: 2.124 (in lunar gravity)
Lunar Module
There you have it. The maximum available delta-v shows that a speed of 2,220 m/sec is achievable. That calculates out to 7,992 kph.
Any other questions????
[edit on 27 July 2010 by weedwhacker]
Originally posted by zvezdar
reply to post by FoosM
Except that there was a successful "fire in the hole" test during the Apollo 5 mission. I dont know where this random forum member gets his information but he is wrong.
A 1966 schedule called for LM-1 to be delivered to Cape Kennedy on 16 November of that year, but the craft ran into difficulties in manufacturing (see Chapter 8) and the months slipped by. Changes after the command module fire (see Chapter 9) caused further delays, and LM-1 did not arrive in Florida until 27 June 1967 (three months beyond its original launch date).
The first flight of a new aircraft type is always a historic occasion for the type. It is also one of the most dangerous, because the exact handling characteristics of the aircraft are generally unknown. The first flight of a new type is almost invariably flown by a highly experienced test pilot. First flights are usually accompanied by a chase aircraft, to verify items like altitude, airspeed, and general air-worthiness.
A first flight is only one stage in the development of an aircraft type. Unless the type is a pure research aircraft (such as the X-15), the aircraft must be tested extensively to ensure that it delivers the desired performance with an acceptable margin of safety.
Just before dark, at 5:48 on the afternoon of 22 January, after several hours' delay because of equipment problems, Apollo 5 lifted off. The powered phase of booster flight was uneventful, and LM-1, still attached to the S-IVB stage, went into orbit about 10 minutes into the flight. In less than 45 minutes, its attitude control engines pulled LM-1 away from the S-IVB. After checking out the spacecraft for two revolutions, ground control signaled the descent engine to fire for 38 seconds. Four seconds later, LM-1's guidance system sensed that the vehicle was not going fast enough and stopped the engine. The cutoff was a planned feature - in a manned flight, it would give the crew time to analyze the situation and decide whether the engine should be restarted to continue the mission. Under normal conditions, the burn would have started with full tank pressurization and would have reached the proper velocity within four seconds. For this mission, however, the tank was only partially pressurized and it would have taken six seconds to reach the required speed. Because of the premature cutoff, the flight controllers moved to a planned alternate mission.
Ground control sent a switch-off signal to the guidance computer and cut in a mission programmer to command the lander's maneuvers. The descent engine was fired twice more (once for a full 33 seconds). There were two ascent engine firings, one for the fire-in-the-hole abort maneuver. Mueller reported to Webb that all primary objectives had been achieved. LM-1 reentered the atmosphere, and its fiery remains plunged into the Pacific several hundred kilometers southwest of Guam on 12 February.
The ground controllers moved to an alternate plan to fire the descent engine manually two more times. It then performed the "fire in the hole" test and another ascent engine burn. Through no fault of their own, the programmers lost the opportunity to see most of their work tested in flight.
One early concern, though not directly connected with external design, was the firing of the ascent engine while it was still attached to its launch pad, the descent stage. The exhaust blast in the confined space of the interstage structures - called FITH for fire-in-the-hole - could have untoward effects. Some observers feared that the shock of engine ignition might tip the vehicle over.
Gemini Lunar Surface Rescue Spacecraft - The unmanned Gemini spacecraft would be piloted by remote control to a landing near a stranded Apollo lunar module. An extended Gemini re-entry capsule had a passenger compartment for the two rescued astronauts. The basic LSRS design used three Lunar Module descent stages for lunar orbit insertion, lunar landing, and lunar ascent.
. There were problems... Now another question arose: Should we repeat this flight? Grumman felt we should, I disagreed. After considerable technical debate, we decided that the next flight with LM would be manned - which it was, 14 months later.
Originally posted by DJW001
reply to post by FoosM
Can you imagine sending a men to the moon and not being 110% to being able return back to Earth? Lift-offs have always had their problems to this day!
Yes, because you can only be 100% sure of anything. Under the circumstances, they were willing to settle for a somewhat lower percentage.
For that reason, and many others, I call hoax. Because it goes to the theory that there were absolutely too many things that could go wrong to actually attempt the mission. And therefore have 8 missions go to the moon without loss of life is astounding, if not impossible in the 20th century.
Since you don't have that reason any more, please provide the other reasons you keep claiming to have. You are right in that final statement, three lives were lost. Why do you keep forgetting about Apollo 1 except when you want to accuse NASA of being assassins?
Now: are you or are you not the person who made this intentionally misleading post:
www.abovetopsecret.com...
It's not going to go away.
At 17 and 19 June program reviews at Rocketdyne and Bell, respectively, Low learned that qualification tests were progressing with such excellent results (the engine had gone through 53 good tests) that an end to qualification by mid-August seemed possible.27 Success now appeared certain, but the race with the decade was becoming very close.
No the post is not misleading. I dont know why you insist it is. The link to the quote is there, and I didnt link it to you.
It wasnt even a reply to you. What you think you are the only one who thought Earth light has influence on the moon?
An oldy but a goody. I seem to remember a couple years ago the person who made this video came out and admitted the hoax. Either way, one of my favorite moon landing/ hoax clips.
I am rudbrbs, aka Svector. This is my video and it is a fake. I created it