Page 53 - Apollo Moonships

The apollo moTher ship 51
SPS ROCKET ENGINE GIMBALING
1 PITCH ROTATION
–Z
–X
Pitch gimbaling deflection
Pitch down
+X
2 YAW ROTATION
–Y
Yaw gimbaling deflection
–X
Yaw left
8
12
8 feet
14
15
16 13
3.25
feet
+Z
CM REACTION CONTROL SYSTEM
The Command Module Reaction Control System (CM–RCS) included 12 attitude rockets designed to allow the capsule rotates in any direction (pitch, roll or yaw). Its purpose was to control
the CM orientation in case of launch aborts or when the ship reentered into the Earth atmosphere, at the end of the mission. Both were crucial moments, so the CM–RCS attitude rockets were arranged in pairs, with redundancy in mind: each duo member was fed by a separated propellant supply system. Ten of the thrusters were located in the aft compartment, while the other two in the forward compartment. The CM–RCS was fed by two tanks of monomethylhydrazine fuel and two tanks of nitrogen tetroxide oxidizer placed in the aft compartment, next to a pair of spherical helium tanks that served to pressurize them.
Forward pitch engine system 1
Aft pitch engine system 1
Fuel tank system 1
+X
+Y
Roll engine system 1
Helium service panel system 1
Yaw engine system 1
Helium Tank system 1
Oxidizer tank system 1
Oxidizer service panel
Forward pitch engine system 2
SM–RCS PANEL ASSEMBLY QUAD
5 Secondary Fuel Tank
6 Helium tank
7 Primary fuel tank
8 Primary oxidizer tank
9 Secondary oxidizer tank
10 Fuel isolation valve
11 Inline filter
12 Oxidizer isolation valve
13 Relief valves
14 Check valves
15 Pressure regulators
16 Helium isolated valves
9
Oxidizer tank system 2
7
10 11
NOTE: Plumbing and wiring appear greatly simplified for clarity.
Fuel tank system 2
Helium Tank system 2
Yaw engine system 2
Helium service panel system 2
Aft pitch engine system 2
Roll engine system 2