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MORE - Dosgames 2.0 (Software Company)(1994).iso
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13.cmt
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1994-09-01
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****** BEGIN *** TUTORIAL *** # 1 - 3 ******
38390
Tutorial # 1-3 covers the plane change maneuvers
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..through Descent Orbit Insertion (DOI)
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..and ends before Powered Descent Initiation (PDI).
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The first plane change maneuver takes place as the LM passes
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..directly south of the landing site
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..and uses the RCS DOWN thruster to cancel the northward velocity.
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The first plane change burn begins.
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The LM was moving north at about 0.8 m/s.
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At an acceleration of 0.011 m/s², a 0.8 m/s change takes about 75 s.
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The first plane change maneuver is complete.
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The LM is in the correct attitude for the second plane change burn
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..with the Up body axis facing south
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..since the landing site is in the northern hemisphere.
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Therefore, no attitude changes are required at this time.
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The second plane change occurs when the LM is 87° west of the landing site.
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The LM is rolled to the proper attitude for the second plane change
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..with the Face body axis up.
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Roll program complete.
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The LM is yawed to the proper attitude
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..with the Up body axis tilted 1° to the east.
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The second plane change uses the Descent Engine at 10% (minimum) throttle
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..and requires a velocity change of about 18.5 m/s.
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At an acceleration of 0.29 m/s², the burn takes about 65 s.
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The second plane change burn begins by IGNITING the Descent Engine.
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*** LOOK AT THE LM-CONSUMABLES DISPLAY ***
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The Descent Engine flag is on and the throttle is 10%.
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*** LOOK AT THE INS ORBIT DISPLAY ***
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Watch the north component of the angular momentum angle.
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The burn is complete when the north component is (90 - 2·0.675)° = 88.65°.
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The second plane change maneuver is complete.
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The velocity change was 19.1 m/s and the burn time was 65 s.
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The LM is put into the proper orientation for DOI.
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The RCS YAW control is used to point the LM Left body axis due south.
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Yaw program start.
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Yaw program complete.
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The RCS PITCH control is used to point the LM Face body axis so that
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..it points straight up during the DOI burn at 165° west of the landing site.
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Pitch program start.
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Pitch program complete.
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The DOI burn begins when the LM is 165° west of the landing site.
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The DOI burn reduces the perilune to approximately 20 km
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..at 15° east of the landing site near the beginning of PDI.
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The DOI burn requires a change in velocity of about 18.5 m/s
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..and takes about 50 s at 10% throttle.
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The DOI burn begins by IGNITING the Descent Engine.
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Watch the perilune display ... The burn stops when it nears 20 km.
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The main DOI burn is complete.
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The RCS UP thruster is used to adjust the perilune to 20 km.
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The Descent Orbit is 19.7 km by 99.5 km.
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*** LOOK AT THE LM-CONSUMABLES DISPLAY ***
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The RCS propellant is 97% and the Descent Stage propellant is 98%.
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The LM is put into the proper orientation for the PDI burn
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..at 18° east of the landing site.
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Pitch program start.
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Pitch program complete.
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This concludes TUTORIAL # 1-3 ... The mission continues with TUTORIAL # 1-4.
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