BIPROPELLANT ATTITUDE CONTROL SYSTEM (ACS) THRUSTERS
Overview
Our 5 lbf thrusters combines a high performance injector design with a high temperature Platinum/Rhodium chamber to provide industry leading performance. Moog also offers a new 25 lbf thrust class, which leverages Moog’s experience designing high performance bipropellant engines. Moog ACS engines have been the industry standard with more than 2,000 delivered.
5 lbf ACS Engines
![101-106-1-Bipropellant-Attitude-control-System-(ACS)-Thrusters-grey-bckgrd-700x400.psd](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_646840254/col1/image.coreimg.jpeg/1686671268618/bipropellant-attitude-control-system-dst-11h-grey-bckgrd-700x400.jpeg)
![101-107-1-Bipropellant-Attitude-control-System-(ACS)-Thrusters-grey-bckgrd-700x400.psd](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_646840254/col2/image_copy.coreimg.jpeg/1686671271848/bipropellant-attitude-control-system-thrusters-dst-12-grey-bckgrd-700x400.jpeg)
![](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_646840254/col3/image_copy.coreimg.png/1715103289722/bipropellant-attitude-control-thrusters-dst-13-grey-bckgrd-700x400.png)
![101-109-1-Bipropellant-Attitude-control-System-(ACS)-Thrusters-grey-bckgrd-700x400.psd](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_646840254/col4/image_copy.coreimg.jpeg/1686671276376/bipropellant-attitude-control-system-5-lbf-grey-bckgrd-700x400.jpeg)
Model Family | DST-11H | DST-12 | DST-13/E | 5 lbf Columbium |
Propellant | Hydrazine/MON | MMH/MON | MMH/MON | MMH/MON |
Nominal Steady State Thrust | 5 lbf (22N) | 5 lbf (22N) | 5 lbf (22N) / 6.2 lbf (27.5) | 5 lbf (22N) |
Feed Pressure Range | 80 – 400 psia (5.5 – 27.6 bar) | 60 – 400 psia (4.1 - 27.6 bar) | 80 – 400 psia (5.5 - 27.6 bar) | 39 - 320 psia (2.8 - 22.1 bar) |
Nozzle Expansion | 300:1 | 300:1 | 300:1 | 150:1/300:1 |
Nominal Mixture Ratio | 0.85 | 1.61 | 1.65 / 1.62 | 1.61/1.65 |
Valve | Solenoid | Latching Torque Motor | Solenoid | Latching Torque Motor or Solenoid |
Valve Power | 41 watts max (2 coils wired in series) |
6 watts max (Latch) 7 watts max (primary) 9 watts max (secondary) |
41 watts max (2 coils wired in series) |
6 watts max (Latch) 7 watts max (primary) 9 watts max (secondary) (Torque Motor) 15.6 watts max (solenoid) |
Mass | 1.7 lbm (0.77 kg) | 1.4 lbm (0.64 kg) | 1.5 lbm (0.68 kg) | 1.4 – 2.0 lbm (0.64 – 0.91 kg) |
Length | 10.3 in (262 mm) | 9.6 in (244 mm) | 10.4 in (264 mm) | 9.7-13.5 in (248 - 343 mm) |
Chamber Material | Platinum/Rhodium Alloy | Platinum/Rhodium Alloy | Platinum/Rhodium Alloy | C-103 |
Minimum Specific Impulse | 307 sec | 297 sec | 297 sec | 284 sec/288 sec |
Throughput | 2019 lbm | 1402 lbm (uncoated) 2342 lbm (coated) |
1404 lbm/2169 lbm | 1600 lbm |
Highlights | DST-11H provides highest performance available in a hydrazine/ MON ACS Thruster |
DST-12/13 Provides highest performance available in MMH/MON ACS Thruster | Engine has been in production for more than 30 years, with > 2000 delivered and flown |
25 lbf Engines
![](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_1311042889/col2/image.coreimg.png/1709829746035/25-lbf-thruster-2.png)
![25lbf](/products/propulsion-controls/spacecraft-propulsion/thrusters/bipropellant-thrusters/_jcr_content/par/fullwidthcontainer_v/par/columncontrol_1311042889/col3/image.coreimg.png/1709829762349/25-lbf-thruster-1.png)
Product Line | 25 lbf MMH (Monomethylhydrazine) |
25 lbf Hydrazine (N2H4) |
Propellants (Ox / Fuel) | NTO / MMH | NTO / N2H4 |
Thrust @ Feed Pressure | 25 lbf @ 230 psia | 25 lbf @ 250 psia |
Specific Impulse | ~ 306 sec (Nominal) |
~ 311 sec (Nominal) |
Nozzle Area Ratio | 300:1 | 300:1 |
Mixture Ratio | 1.62 | 0.85 |
Valve Type | Latch/Thruster Redundant Torque Motor |
Latch/Thruster Redundant Torque Motor |
Nozzle Material | Pt / Rh (Chamber) Inconel 625 Nozzle |
Pt / Rh (Chamber) Inconel 625 Nozzle |
Qualification Status | Qualification | Development |