Obviousman
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Spaced out & plane crazy
Joined: May 2005 Gender: Male  Posts: 797 Location: Australia!
|  | Re: Apollo 11 manual landing « Result #8 on Jul 15, 2010, 6:26am » | |
After the P64 programme the LM would go into P65, which was a full auto landing. No-one ever used this, though, and after P64 crews would manually switch to P66, the semi-automatic programme.
From here: Apollo GNC Software (http://apollo.spaceborn.dk/guidance5.html)
Basically P66 can operate in four different ways:
* The computer controls both vertical speed as set by the crew and nulls the horizontal speed, * The computer control only vertical speed as set by the crew, while the crew selects the attitude with the hand controls, to null the horizontal speed, * The crew controls the throttle of the engine to control the descend rate, while the computer nulls the horizontal speed, * The crew controls both the engine throttling and the attitude, and thereby lands the LM themselves. This is only practical for the two crewmembers at the same time.
P67 was full manual control.
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"Truth needs no defence. Nobody - NOBODY - can ever take the footsteps I made on the surface of the Moon away from me." Gene Cernan, Apollo 17
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