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Discussion History

Vacuum Engine

Assembly

Vacuum variant of the booster engine with a large radiatively cooled nozzle extension, raising specific impulse from ~310 s to ~348 s. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Vacuum Engine parts and their functions

7 top-level parts · 54,695 parts in total · full bill of materials below
Vacuum Engine parts diagram: 1 turbopump, 2 thrust chamber & nozzle, 3 nozzle extension, 4 injector, 5 engine valve, 6 engine controller, 7 engine plumbing & hardware. 54,695 parts in 7 assemblies.
Vacuum Engine parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Turbopump 6 parts 1× Single-shaft turbopump spinning at ~36,000 rpm; one turbine drives back-to-back LOX and RP-1 centrifugal pump stages.
2 Thrust Chamber & Nozzle 1× Regeneratively cooled combustion chamber and bell nozzle; RP-1 flows through milled coolant channels in the liner before injection.
3 Nozzle Extension 1× Niobium or carbon-composite radiatively cooled skirt expanding the nozzle to a ~165:1 area ratio for vacuum operation.
4 Injector 2 parts 1× Flat-face injector that meters and atomises both propellants into the chamber through hundreds of discrete elements.
5 Engine Valve 6× Pneumatically or hydraulically actuated propellant valve sequencing engine start, mainstage and shutdown.
6 Engine Controller 5 parts 1× Dual-channel engine control unit that closes the loop on chamber pressure and mixture ratio and executes start/shutdown sequences.
7 Engine Plumbing & Hardware 6 parts 1× The propellant, purge and pneumatic lines, gimbal actuators, igniter and the brazed joints, B-nuts, seals, clips and bolts that take one engine to its ~50,000-part total.

3D model

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Build & assembly graph

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Bill of materials for Vacuum Engine

7 top-level lines · 26 rows shown · 54,695 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Turbopump 6 parts orbital-launch-vehicle-turbopump 1× 1 55 assembly
1.1 Pump Impeller orbital-launch-vehicle-pump-impeller 2× 2 · part
1.2 Pump Inducer orbital-launch-vehicle-pump-inducer 2× 2 · part
1.3 Turbine Wheel orbital-launch-vehicle-turbine-wheel 1× 1 · part
1.4 Ball Bearing ball-bearing 4× 4 · part
1.5 O-Ring Set oring-set 6× 6 · part
1.6 Fastener Set fastener-set 40× 40 · part
2 Thrust Chamber & Nozzle orbital-launch-vehicle-thrust-chamber 1× 1 · part
3 Nozzle Extension orbital-launch-vehicle-nozzle-extension 1× 1 · part
4 Injector 2 parts orbital-launch-vehicle-injector 1× 1 701 assembly
4.1 Injector Body orbital-launch-vehicle-injector-body 1× 1 · part
4.2 Injector Element orbital-launch-vehicle-injector-element 700× 700 · part
5 Engine Valve orbital-launch-vehicle-engine-valve 6× 6 · part
6 Engine Controller 5 parts orbital-launch-vehicle-engine-controller 1× 1 1,846 assembly
6.1 Bare PCB pcb-bare 2× 2 · part
6.2 Microcontroller mcu 2× 2 · part
6.3 SMD Passive (R/C/L) smd-passives 1800× 1,800 · part
6.4 Connector connector 30× 30 · part
6.5 Pressure Sensor pressure-sensor 12× 12 · part
7 Engine Plumbing & Hardware 6 parts orbital-launch-vehicle-engine-plumbing 1× 1 52,085 assembly
7.1 Engine Gimbal Actuator orbital-launch-vehicle-gimbal-actuator 2× 2 · part
7.2 Torch Igniter orbital-launch-vehicle-igniter 2× 2 · part
7.3 Engine Heat Exchanger orbital-launch-vehicle-heat-exchanger 1× 1 · part
7.4 Engine Line orbital-launch-vehicle-engine-line 80× 80 · part
7.5 Brazed Joint orbital-launch-vehicle-brazed-joint 40000× 40,000 · part
7.6 Tube Fitting orbital-launch-vehicle-tube-fitting 12000× 12,000 · part

Where the vacuum engine is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Second Stage

Sourcing: possible vendors

Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $500–$50k. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳Weichai Power
weichai.com ↗ 		Weifang, CN Diesel & power engines 50 units 12–16 wks
🇮🇳Cummins India
cumminsindia.com ↗ 		Pune, IN Diesel engines 50 units 12–16 wks
🇨🇳Yuchai
yuchai.com ↗ 		Yulin, CN Diesel engines 50 units 12–16 wks
🇮🇳Kirloskar Oil Engines
koel.co.in ↗ 		Pune, IN Diesel & gas engines 50 units 12–16 wks
🇮🇳Ashok Leyland
ashokleyland.com ↗ 		Chennai, IN Engines & commercial vehicles 50 units 12–16 wks