Tuesday, August 1, 2023

The Book Of The Moon, Rick Stroud, c. 2009

The Book Of The Moon, Rick Stroud, c. 2009. 523.9STR.

Absolutely fascinating. 

The Apollo missions, starting on page 212.

The Apollo programme: 1961 - 1972.

Apollo 11: in depth; log of communications of landing.

CAPCOM
COLUMBIA
EAGLE

  • mission launch: 13:32, July 16, 1969
  • entered lunar obit: July 19, 1969
  • 30 orbits, passing over the planned landing site, in the Sea of Tranquility
  • site had been recced by Ranger 8 and the Surveyor 5 lander
  • Neil Armstrong and Buzz Aldrin (LM pilot) enter the Eagle Lunar Module: July 20, 1969
  • Mike Collins piloting Columbia
    descent controlled by the onboard Guidance and Navigation System
  • tiny computer
    • 74 KB: fixed wired memory and the equivalent of 2 KB of 16-bit RAM
    • far less than the systems that control modern automobile
  • descent began 25 miles over the moon's surface; travelling backwards at 3600 mph
  • at 7000 feet, the LM would flip over so Armstrong and Aldrin could see the moon's surface
  • at 2000 feet, Armstrong would be able to fly the LM by hand
  • communications from the LM back to earth not good, so Collins relayed the LM's comm
  • huge error -- described in book; I may transcribe it later
  • the GO for continued descent cam from the 26-year-old Guidance Officer (GUIDO), Steve Bales
  • it took him 10 - 15 seconds to decide; anything over three seconds in descent is too long
  • Steve Bales earned the US Medal of Freedom for his actions
  • at 9000 feet, the LM rolled again; Armstrong and Aldrin could see the Sea of Tranquility but did not know where they were relative to the landing site
  • alarms again went over
  • Steve Bales again overrode the alarm and called GO. They were at 2000 feet.
  • landed safely. Engine cutoff.


Apollo 13:

  • April 11, 1970
  • 46 hours into the mission: the explosion
  • CM: Odyssey
  • LM: Aquarius 
  • crew picked up by USS Iwo Jima
  • in the slingshot around the moon, the mission altitude on the far side off the moon was 100 km higher than any other Apollo mission;
  • the mission is listed in the Guinness Book of Records as having the absolute altitude record for a manned spacecraft
  • for the superstitious, a number of odd coincidences
    • the number 13 itself is considered unlucky
    • the mission launched at 11.4.70 UTC -- digits add up to 13 -- at 13.13 Central Standard Time,
    • mission launched from Complex 39 (13 x 3)
    • the explosion occurred at 19:13 CST on April 13;
    • post-flight estimate of the cost of the damage was $13 million

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