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Originally posted by Phage
reply to post by pepsi78
The primary guidance, navigation and control system (PGNCS) on the LM was developed by the MIT Instrumentation Laboratory. The Apollo Guidance Computer was manufactured by Raytheon. A similar guidance system was used in the Command Module. A backup navigation tool, the Abort Guidance System (AGS), was developed by TRW.
To learn lunar landing techniques, astronauts practiced in the Lunar Landing Research Vehicle ( LLRVAt the start of the Apollo program in 1960, there were no simulators for would-be moonwalkers to learn the art and finesse of landing on the lunar surface. So, as the program got under way, NASA began planning for such simulators. Three types were develop), a flying vehicle that simulated the Lunar Module on earth.
www.economicexpert.com...:Lunar:Module.htm
Originally posted by Phage
reply to post by pepsi78
Why drop anything from Earth orbit without a parachute or aerodynamic controls? We have a nice atmosphere to use to help slow down. It wouldn't make much sense to use rockets if you don't have to.
[edit on 11/18/2009 by Phage]
How does speed make something unstable?
But you're right about the difficulty in testing a system like this on Earth. The velocity of an Earth orbit is much greater than a lunar orbit. You have to worry about the heat generated by re-entering the atmosphere.
Since gravity on Earth is 6 times that of the Moon, it would take more thrust and fuel to accomplish a landing.
These are some of the reasons the LM was never tested on Earth. It wouldn't work on Earth but it worked just fine on the Moon, six times out of six.
LLRV no.1 crashed when there was a mechanical failure in the steering jet system, forcing Armstrong to eject. The other two failures were also a result of technical problems in the very new fly-by-wire system. There were more than 100 successful flights of the LLRV.
The LM powered descent maneuver will be initiated at the 50,000-foot altitude point of the descent orbit and approximately 14 ° prior to the landing site. This maneuver will consist of a braking phase, an approach phase, and a landing phase. The braking phase will use maximum thrust from the DPS for most of this phase to reduce the LM's orbital velocity. The LM will be rotated to a windows-up attitude at an altitude of 45,000 feet. The use of the landlng radar can begin at an altitude of about 39,000 feet, as depicted in Figure 16. The approach phase, as shown in Figure 17, will
begin at approximately 7600 feet (high gate) from the lunar surface. Vehicle
attitudes during this phase will permit crew visibility of the landing area through the forward window. The crew can redesignate to an improved lunar surface area in the event the targeted landing point appears excessively rough. The landing phase will begin at an altitude of 500 feet (low gate) and has been designed to provide continued visual assessment of the landing site. The crew will take control of the spacecraft attitude and make minor adjustments as required in the rate of descent during this period.
The vertical descent portion of the landing phase will start at an altitude of 125 feet and continue at a rate of 3 fps until the probes on the foot pads of the LM contact the lunar surface. The CDR will cut off the descent engine within 1 second after the probes, which extend 68 inches beyond the LM footpad, contact the lunar surface although the descent engine can be left on until the footpads contact the lunar surface. The lunar surface contact sequence is shown in Figure 18.
Originally posted by bowlbyville
(i.e. you can’t eat your cake twice).
Speed does not cause instability. Yes, in an atmosphere there can be aerodynamic instability but there was no atmosphere. What "fatal mistake" can happen with 60 miles of vacuum beneath you?
As the LM descended it also slowed down using its rocket engine and control jets. By the time it got close to landing it was moving slowly. It didn't just plummet to the surface then try to hit the brakes.
apollo.spaceborn.dk...
The engine of the LM was not powerful enough to use in Earth gravity. It could not be tested on Earth.
Originally posted by ALLis0NE
reply to post by pepsi78
Wow, you show a total lack of knowledge of the RCS.
The Reaction Control System is what kept them from rotating out of control using translation thrusters (horizontal stabilizers) for "balance". They used the RCS to keep the bottom of the LM pointed towards the Moon so they could use the vertical thrusters to slow them down.
You claim that "any small movement can make them go out of control" but you are completely ignorant to the opposite statement that "any small movement can keep them in control", and that is what the RCS is for.
[edit on 18-11-2009 by ALLis0NE]
Originally posted by pepsi78
Speed does cause instability because speed + gravity= mass.
The more speed it has the more heavier it becomes because of it's kinetic energy. Once it gets heavier it's harder to manuver, it can spin out of direction easyer.
Originally posted by pepsi78
At free fall from orbit the object picks up mass
Originally posted by pepsi78
There is no way 7 tones falling from orbit can somehow land safe with people inside it on the moon. It's a fantasy.
Originally posted by pepsi78
To show you why it's impossible take a look at this vid 24 meeters per second at landing point all this after it glided with a parachute, the drone is no where compared in weight to the LEM.
Take a good look at this vid parachute + thrusters.
Take notice of the Martian enviorment. Gravity there is 38% of earths gravity.
Originally posted by pepsi78
The drone from mars used a parachute.
Originally posted by pepsi78
Originally posted by Phage
The engine of the LM was not powerful enough to use in Earth gravity. It could not be tested on Earth.
Bingo, the force needed for the moon would of been greater.
Yes, on Mars there is an atmosphere. A parachute works on Mars it does not work on the Moon. That is why they used a rocket to slow down.
On Earth the fully loaded LM weighed 32,000 pounds. On the Moon it weighed 5,333 pounds because of the reduced gravity. Actually, by the time it landed it weighed less than that because almost all of the 18,000 pounds of fuel in the descent stage had been burned on the way down. See the difference?
See the problem? On the Moon the engine produced more thrust than the weight of the craft.
On the Moon the LM could hover and even gain altitude if necessary. On Earth it could not.
Speed + gravity = mass? Please provide a source for that equation. You've now entered the realm of bonehead arguments. I'm done.