![no gravity in space shuttle no gravity in space shuttle](http://basementrejects.com/wp-content/uploads/2013/10/gravity-2013-space-station-floating-scene-sandra-bullock.jpg)
Indeed, we are raising our orbit height, so our burning point ( Old Apogee) will be lower than the new apogee, hence becoming the new perigee. You can see that the new Perigee ( TGT HP) is equal to our current apogee (CUR HA) So we want to raise the orbit by 75 Nm, which corresponds to 150 ft/sec to add in a prograde burnġ50 ft/s is then added in item 19, next to DVX ( burn in the velocity vector to change just the height of the orbit, and not the inclination or position of Apogee/perigee)įorecasted Apogee (TGT HA) is 159 nm, fair enough. Then, how much thrust will we add? We want to raise the orbit to a new apogee of 150 Nm ( Heads up: 2ft/sec equal in a raise of 1Nm of the orbit height) MET is now 34mn06sec, so we want the ignition to be at 20+34=54 mn into the mission. We gonna do it at next apogee, 20 mn from now (TTA) Then, we have to decide in item 10 the time of the burn. Resultant trust forces will be parallels to the X bodys axis,containing the Center of Gravity (for a 2 engines burn) Trim angle (in yaw mainly) allow good gimbals of the OMS. Now, some computer manipulations to prepare the burn.įirst, we gonna enter some trim angle for the OMS engine, in yaw and pitch. Helium avoid the risk of explosion, a leak in this cavity will lead to an engine stop during ascent) The Oxygen Turbopump is actionnated by the preburner gases, so there is a risk of mixing between LOX from Turbopump and LH2/LOX preburner mixture. Also, it allows some inerting between critical parts in the engines. (Helium is used normally to actionnate pneumatically activated valves in the SSME. Helium lying in the SSME will be used for that, feedlines fills and drains will be opened and connected to manifold/SSME lines and helium tanks. Normally it should start automatically, but we gonna configure it manually. One of the first things to do after ET separation is the propellant dump (Liquid Oxygen and Hydrogen that weight 3 tons in SSME and propellant feedlines)
![no gravity in space shuttle no gravity in space shuttle](http://www.collectspace.com/images/news-100313b-lg.jpg)
Normally, if Mission Control Center (MCC) asks we can manoeuver the Shuttle around the ET to take pictures for further Inspection