Apollo Saturn User Manual download pdf (Page 47)

,¢_,!

S-IC SI'AGE TIIRLI'ZTVkCT9R CONTROL S_. _EI-i

The fo_,r outboard F-I engines are gimbal mounted on the stage thrust

_tructure to provide attitude control durlnp S-_C stage powered flight. Each

]_dt-pendent gimbal system employs t,:o hydraulic servo actuators. These servo

actuators copvert electrical command signals (from IU Flight Control Computer)

and hydraul_c presmure into mechanical outputs ,.:hlchgimba] the outboard engines .

on the S-IC stage. ._n integra_ mechanic,l feedback, varied by piston position,

modifles th.. effec= of the control signal from t:_e FCC. Built-in servo actuator

po_entiemeters se_,se servo actuator p,_si_ions for telemetry as well as providing !

an _.nterleck to preclude !iftoff with a,, engine hardover.

Hydraui_c pressure is supplied to the X1lrust Ve'etor :ontrol System from a

• GSE pressure source duz'iug prelaunch checkout and engine start. The GSE pressure

source utilizes RJ-]. ramjet fuel as the hydraulic fluid. During engine operation,

hydr-.ulic pressure _s supplled from the fuel discharge of the engine turbo pump

to the se_vo actuators. The fuel returns th:ough a check valve to the fu;! inlet

of the turbo pump. RP-.I, the fuel used by the S-IC stage, is used as the hydraulic

fl,dd during englnc operation.

1970011707-047

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 91 92

No comments

Apollo Saturn User Manual Page 47