Timeline for Docking of CSM with LM
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 11, 2019 at 15:06 | comment | added | Tristan | @Niranjan They always rotated 180 degrees in pitch for Turnaround, Docking, and Extraction. Performing the same rotation in yaw would have them pass through either +90 degrees or -90 degrees yaw, which would create a gimbal lock singularity, causing the guidance system to lose all pointing information. Of course they used RCS to perform the maneuver -- it's the only way they could adjust the spacecraft attitude. | |
| Jan 11, 2019 at 3:20 | comment | added | Niranjan | @Tristan: I am somewhat confused. 1- Whether YAW or PITCH, the orientation needs to be changed (to capture LM from SLA), and this (LM)will be the new target. 2 - Do you think / know that RCS is not used for such purpose? This is similar to minor mid-course corrections required by the craft. | |
| Jan 10, 2019 at 15:01 | comment | added | Tristan | @Niranjan It's not that they can't yaw, it's that it would cause the guidance platform -- and therefore, the whole guidance system -- to lose track of where they are pointing. Not a good situation when you need precise pointing to get to where you need to go. | |
| Jan 10, 2019 at 3:45 | comment | added | Niranjan | @Tristan. Hi Tristan, thanks for the answer. But then what if the craft need to change the YAW beyond 90 degree? I feel, once in space, the YAW, PITCH and ROLL functions are carried out using RCS (reaction Control System) - 4 set of 4thrusters each are mounted on diagonaly opposite corners of the craft. The RCS does not have a gimbal, instead, using two thrusters located on opposite ends, and pointing in opposite directions create the required moment. Please correct me if I am wrong. | |
| Jan 8, 2019 at 19:28 | comment | added | Organic Marble | Great research and answer! | |
| Jan 8, 2019 at 15:29 | history | answered | Tristan | CC BY-SA 4.0 |