Design & engineer
Mechanical, Structures & Thermal
Designing and analyzing a vehicle's structures, tanks, mechanisms and thermal control so it survives launch and space.
What it is
Mechanical, structures and thermal engineers design the physical rocket or spacecraft: the main structure and tanks, the mechanisms that release, deploy and point things, and the heaters, coatings and radiators that keep hardware within its temperature limits. Analysts check that every part survives the loads, vibration and temperature swings of launch and orbit, and tests confirm the numbers. The same skills also build the ground support equipment that holds, fuels and releases a vehicle on the launch pad.
What you actually do
- Model parts and assemblies in CAD and release drawings with GD&T that the machine shop and suppliers build from.
- Run hand calculations and finite element analysis for stress, vibration, fatigue and fracture, and document the margins.
- Build thermal models of a spacecraft or component and choose heaters, heat pipes, interface materials and coatings.
- Plan and support structural, vibration and thermal vacuum tests, then compare the results with your models.
- Work on the floor with technicians and fabricators to build hardware and fix problems as they come up.
- Review parts that came out of spec and decide, with supporting analysis, whether they can be used, reworked or scrapped.
A day of this work, concretely
Size a tank dome for a new stage
The vehicle team needs a lighter propellant tank. You trade material, thickness and weld locations, run stress analysis for pressure and flight loads, and check the design against the program's factors of safety. The result goes to manufacturing as a drawing and to test as a proof-pressure plan.
Close a satellite thermal design
A high-power electronics box runs hot in your thermal model. You add a heat path through a thermal interface material to a radiator panel and rerun the hot and cold orbit cases. The fix is then confirmed in a thermal vacuum test of the unit.
Design a launch pad mechanism
The pad needs a mechanism that holds the rocket down and releases it at liftoff. You agree the interface with the vehicle engineers, design the structure and hydraulics, and analyze it in FEA. Then you support the build, the installation and the first functional tests at the launch site.
Is it right for you?
Most people here studied mechanical or aerospace engineering, and some come from civil engineering, physics or materials science. It is the widest engineering door into space: experience from automotive, heavy equipment, consumer hardware and civil structures all transfers. Designers who like seeing parts made, and analysts who like knowing exactly why a part will not break, both do well.
You will likely enjoy it if
- You like turning a load, a temperature range or a motion into a part someone can actually make.
- You enjoyed statics, dynamics, strength of materials or heat transfer more than most of your coursework.
- You want to work hands-on with machinists, welders and technicians, not only in software.
- You are careful with documentation, because every analysis and drawing is reviewed before hardware flies.
What you need
- Bachelor's degree in mechanical or aerospace engineering (some roles accept civil engineering, physics or math)
- Working knowledge of 3D CAD and FEA, through coursework, project teams or internships for entry-level roles
- Understanding of GD&T to ASME Y14.5
- U.S. person status under ITAR for most US roles
Skills that help
How to get started
- 1Earn a mechanical or aerospace engineering degree and take structures, vibrations, heat transfer and materials electives.
- 2Join a Formula SAE, rocketry, CubeSat or robotics team and take one part from concept through build and test.
- 3Learn a professional CAD package (Siemens NX is common in space) and practice producing a complete drawing with GD&T.
- 4Learn one FEA tool well, and check every model against a hand calculation so you can explain the result.
- 5Build a short portfolio showing parts you designed, the analysis behind them and photos of the finished hardware.
- 6Apply for new-graduate mechanical, structures or thermal roles; if you are changing careers, lead with production hardware you owned in another industry.
Common misconceptions
Myth: Mechanical engineers in space only draw parts in CAD.
Reality: Design is one part of it. The job also includes analysis, test planning, time on the factory floor and resolving problems with parts that came out wrong.
Myth: You need aerospace experience to get in.
Reality: Entry-level postings ask for coursework, project team or internship experience, and some name Formula SAE, rocketry, CubeSat or robotics teams as a plus. Experience building hardware in automotive or heavy equipment also transfers.
Myth: Structures work is just making parts strong.
Reality: Every kilogram costs performance, so the job is making parts strong enough, with documented margins, and no heavier. Analysts trade material, thickness and shape against factors of safety set by standards and confirmed by test.
What it pays
Mechanical work typically pays $110k–$216k/yr today, with a live median of $132k/yr across the 324 open roles that state their pay.
Frequently asked questions
What software do spacecraft structures and thermal engineers use?
Postings most often name Siemens NX with Teamcenter for CAD and data management, with SolidWorks at some companies. For analysis they name Ansys, Femap with Nastran and Abaqus for structures, NASGRO for fracture and Thermal Desktop for thermal models. Python or MATLAB for calculations and test data shows up in many postings. Learning one CAD tool and one analysis tool deeply matters more than listing many.
Do I need a PE license to work on rocket or spacecraft structures?
Design and analysis roles at launch and satellite companies usually ask for an engineering degree with CAD and FEA skills, not a license. A PE shows up mostly in civil, facilities and launch pad infrastructure roles, and even there it is often listed as preferred. If you want the option later, the FE exam is generally the first step toward a PE license (NCEES). The degree side of the path is covered in how to become an aerospace engineer.
Which standards should a space structures engineer know?
NASA-STD-5001 sets structural design and test factors of safety for spaceflight hardware (NASA Technical Standards), and drawings follow ASME Y14.5 for GD&T. Postings also list SMC-S-016 and MIL-STD-810 among the design and environmental test standards they want you to know of. You do not need them memorized to apply, but understanding why factors of safety and test levels exist helps in interviews.
Can I move into space structures from automotive or civil engineering?
Yes. Entry-level postings accept degrees in mechanical, aerospace and sometimes civil engineering, and they value hands-on build experience over an aerospace background. Lead with hardware you designed and saw built, the analysis behind it and any test work. The mechanical, structures and thermal roles page lists 772 open roles today, and the ITAR guide explains the U.S. person rule most of them carry.
Related kinds of work
Propulsion & Engines
Designing, building and test-firing the engines, motors and thrusters that move rockets and spacecraft.
Systems, Integration & Test
Make sure every part of a rocket or satellite works together, then prove it on the ground before it flies.
Manufacturing & Technicians
Build rockets and satellites by hand and machine: machining, welding, composites, harnesses and assembly.