Apollo 11 flight journal – day 1, part 2 earth orbit and translunar injection electricity out


CSM Weight (Noun 47): 63,481 pounds (28,794 kg). Strictly speaking, a more appropriate term to use gas finder would be mass rather than weight. Weight is defined as the force an object exerts when acted upon by gravity whereas mass is a measure of the quantity of matter an object contains. A 1-kg mass exerts 9.81 Newtons on Earth but we would tend to measure that force with a spring balance and call it 1 kilogram. On the Moon, it exerts 1.62 Newtons but its mass electricity video ks1 is still 1 kilogram so spring balances would have to be recalibrated to read properly. In space, without engines running (i.e. during coast), it exerts essentially no force at all yet still has 1 kilogram of mass.

Pitch and yaw trim (Noun 48): -1.53° and +1.32°. The SPS engine is mounted on gimbals and can be aimed so that its thrust vector (the direction in which it pushes) acts through the spacecraft’s centre of mass. These angles represent a calculated direction for these gimbals. They will gas key staking tool only be used if the crew need to control the burn manually using the Stabilization Control System (SCS). In a normal automatic burn, the TVC (Thrust Vector Control) system automatically adjusts these angles for shifts in the stack’s centre of mass.

Imagine the point where this line intersects the planet’s surface. We can further imagine a flat plane at this point parallel to the horizontal. Obviously, as the spacecraft moves gas in california across the planet, the absolute orientation of this plane keeps changing but it provides a useful reference for orbital velocity computation. In this arrangement, the plus-Z axis is along the vertical line towards the planetary centre, the plus-X axis is in the direction of orbital motion parallel to the local horizontal and the plus-Y axis is perpendicular to the orbital plane.

Delta-V C: 5,334.9 fps. Delta-V C is really about giving the crew another method of controlling their engine. If all goes well, the Guidance and Navigation system will monitor gas mask art the burn and, taking into account the extra thrust imparted by the engine after it is shut down, it will stop the burn at the right time to give the required total Delta-V. Should the GN system fail to shut down the engine, the Entry Monitor System (EMS) can do it as it contains an accelerometer that measures Delta-V along the X-axis. This accelerometer drives a counter (hence ‘C’) that decrements towards zero, at which point it would send a signal to stop the engine. However, the EMS does not take into account the electricity and magnetism worksheets tail-off thrust. For this reason, the figure for Delta-V C is slightly lower than Delta-V T. The crew would enter it into the EMS Delta-V display prior to the burn.

As well as the gyro-stabilised guidance platform, the spacecraft has a backup gas tax set of gyros. However, instead of being mounted on an independently stabilised platform, these are affixed to the spacecraft’s structure. If the spacecraft rotates, these ‘Body Mounted Attitude Gyros’ (BMAGs) resist that turning and apply a force to their mountings. A measurement of this force provides the basis for a determination of attitude. If you know the starting attitude, then processing the signals from the BMAGs will permit the current attitude to be determined. It is the job of the Gyro Display Couplers (GDCs) to carry out this task, but there are two problems with this arrangement. First, the attitude measurement is much more prone to drifting power generation definition away from the truth when compared to the measurements from the platform. Second, because of this drift, it regularly needs an accurate starting point. If the primary guidance system is working, then its knowledge of their attitude can be passed to the GDCs gas efficient cars 2012 which is achieved merely by pressing the ‘GDC Align’ button. If, however, the primary system is not working, the GDCs must be aligned with reference to the stars. This is the reason that McCandless read up some GDC Align information.