science

TRI-D (rocket engine)

TRI-D (rocket engine) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand TRI-D (rocket engine) rather than just read about it. In short: TRI-D is a 3D printed metal rocket engine. Students from the Students for the Exploration and Development of Space at University of California, San Diego (SEDS at UC San Diego) built the metal rocket engine using a technique previously confined to NASA, using a GPI Prototype and Manufacturing Services printer via the Direct metal laser sintering (DMLS) method.

Key takeaways

TRI-D (rocket engine) belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TRI-D (rocket engine) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TRI-D (rocket engine) from memory before moving on to harder problems.

Reference excerpt

TRI-D is a 3D printed metal rocket engine. Students from the Students for the Exploration and Development of Space at University of California, San Diego (SEDS at UC San Diego) built the metal rocket engine using a technique previously confined to NASA, using a GPI Prototype and Manufacturing Services printer via the Direct metal laser sintering (DMLS) method. UCSD students were the first group in the world to 3D print a rocket engine of its size, other than NASA as of February 2014. The Tri-D engine cost US$6,800.

Development The Tri-D rocket engine was designed and built with the cooperation of NASA’s Marshall Space Flight Center, to explore the feasibility of printed rocket components. It was designed to power the third stage of a Nanosat or Cubesat launcher, i.e. an engine capable of launching satellites that weigh less than 1.33 kg (2.93 lb).

Specifications Tri-D is around 17.7 cm long and weighs around 4.5 kg. It was fabricated using a chromium-cobalt alloy powder. The propellants are kerosene and liquid oxygen. The engine produces about 200 pounds-force (890 newtons; 91 kilograms-force) thrust. According to Gizmag "the injector has a Fuel-Oxidizer-Oxidizer-Fuel inlet arrangement with two outer fuel orifices converging with two inner oxidizer orifices". The engine has a regenerative cooling jacket that extends to the nozzle to prevent the engine from overheating while firing. The combustion chamber was designed to burn the propellants in the middle of the chamber and keep as much heat generated as possible away from its chamber walls, while at the same time insulating the wall with a film of cooler gases.

Printer The engine was printed with a GPI Prototype and Manufacturing Services printer using a technique called Direct metal laser sintering (DMLS). In the process of printing, a powder of the chromium-cobalt alloy is spread in a thin layer. Then computer-controlled laser fuses the powders into a cross section of the engine component. The machine then spreads a second layer of powder and the process continuously repeats until each component is complete. Any excess powder is removed as are temporary supports that were printed to hold the components together during printing process. Finally it is hardened, polished and assembled.

Test firing The test firing at Mojave went without any problems and the engine exhaust achieved 200 pounds-force (890 newtons; 91 kilograms-force) thrust. The team claimed "it was a resounding success and could be the next step in the development of cheaper propulsion systems and a commercializing of space".

Injector test On a separate engine, a 3D printed injector was test fired in a conventionally manufactured engine. In the test of the injector on August 22, 2014, the engine generated 20,000 pounds-force (89,000 newtons; 9,100 kilograms-force) thrust.

References

Worked examples

Example 1 — a first encounter with TRI-D (rocket engine)

Start with the simplest possible case. Write down what TRI-D (rocket engine) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to TRI-D (rocket engine) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about TRI-D (rocket engine) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of TRI-D (rocket engine)

In research: TRI-D (rocket engine) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses TRI-D (rocket engine) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: TRI-D (rocket engine) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3D printed objects, Rocket engines using kerosene propellant, so understanding it makes those chapters shorter.
In everyday life: Look for TRI-D (rocket engine) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study TRI-D (rocket engine) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TRI-D (rocket engine) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain TRI-D (rocket engine) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TRI-D (rocket engine) in simple terms?

Why does TRI-D (rocket engine) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study TRI-D (rocket engine)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on TRI-D (rocket engine).