Gas Jets

FLEXIBLE AND FAST; USEO IN ANY ENVIRONMENT. POWERFUL

USeS CONSUMABLE JFUELI WITH UM1TCO SUPPLY AVAILABLE DUE TO FUEL WEIGHT; TOO POWERFUL FOR SOME APPLICATIONS IRRELATIVELY COARSE CONTROU; COMPLEX AND EXPENSIVE PLUMBING SUBJECT TO FAILURE

MAGNETIC (ELECTROMAGNETS)

USUALLY LOW POWER. MAY B£ DONE WITHOUT USING CONSUMABLES BY USE OF SOLAR POWER

SLOW. NEAR EARTH ONLY; APPLICABILITY LIMITED BY DIRECTION OP THE EXTERNAL MAGNETtC FIELD; COARSE CONTROL ONLY (BECAUSE OP MAGNETIC FIELD MODEL UNCERTAINTIES AND LONG TtME CONSTANTS!

REACTION WHEELS*

PARTICULARLY GOOD FOR VARIABLE SPIN RATE CONTROL; PAST. FLEXIBLE. PRECISE ATTITUDE CONTROL AND/OR STAB' LlZATION

REOUI RES RAPIDLY MOVING PARTS WHICH IMPLIES PROBLEMS OF SUPPORT AND FRICTION. MAY NEED SECOND CONTROL SYSTEM TO CONTROL OVERALL ANGULAR MOMENTUM 1 "MOMENTUM DUMPING"! IN RESPONSE TO CUMULATIVE CHANGES BY ENVIRONMENTAL TORQUES. EXPENSIVE

ALTERNATIVE THRUSTERS' KM OR ELECTRIC

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