science

RFA One

RFA One 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 RFA One rather than just read about it. In short: RFA One is a small-lift multistage launch vehicle with an on-orbit transfer stage designed to transport small and micro-satellites of up to 1,300 kg into low-Earth polar and Sun-synchronous orbits. It has been in development by German private company Rocket Factory Augsburg since 2019.

Key takeaways

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

Reference excerpt

RFA One is a small-lift multistage launch vehicle with an on-orbit transfer stage designed to transport small and micro-satellites of up to 1,300 kg into low-Earth polar and Sun-synchronous orbits. It has been in development by German private company Rocket Factory Augsburg since 2019. The vehicle is 30 m (98 ft) long with a diameter of 2 m (6 ft 7 in). Both main stages use RP-1 fuel and liquid oxygen oxidizer, while the transfer stage uses storable propellants. Initially aiming to launch in 2022—with subsequent delays moving the target to 2024—following an anomaly on a ground test stand in August 2024, the maiden launch is now slated for no earlier than August 10 2026.

Description The first stage is powered by nine Helix engines, each producing 100 kN (22,000 lbf) of thrust. The second stage will use a vacuum-optimised version of the Helix engine. The Helix engine uses rocket grade kerosene, known as RP-1, fuel and liquid oxygen oxidizer. During 2020 the company redesigned Helix from a gas-generator cycle to an oxygen-rich staged combustion cycle. Some components used in early engine versions, such as the turbopump, were procured from the Ukrainian company Pivdenmash to shorten development time. Later versions of these components have been developed internally. The third (or "orbital") stage, named Redshift, will function as an orbital transfer vehicle (OTV). Powered by an RFA-developed Fenix engine, with propellants of nitromethane fuel and nitrous oxide oxidizer the engine can be restarted multiple times on orbit. This allows the vehicle to achieve different orbits within a single flight and complete various missions for particular customers.

Production and testing The rocket is designed for serial production and is aiming to use a large number of COTS components to reduce production and launch costs. Major components of the engines of the first two stages are to be 3D printed. In August 2021 RFA performed a cryogenic pressure test on a prototype first stage, during which the prototype burst. Three hot fire tests for performed with the Helix rocket engine with a total duration of 74 seconds in July 2022. The second stage was approved for flight operations in May 2023 through the integrated system test with 280 seconds of hot fire. In April 2024, RFA reported successful installation of five of nine Helix engines onto RFA One's first stage in preparation for transport to SaxaVord Spaceport for hot-fire stage testing. The first stage of the RFA One arrived in SaxaVord Spaceport in May and successfully performed its first hot fire test with five Helix engines that same month. On Monday, 19 August 2024, a static fire test of the first stage with all nine engines, the stage that was slated to fly on the maiden flight of RFA One, experienced an anomaly that resulted in a fire, subsequent explosion, loss of the stage, and major damage to the launch mount. Ground testing of a new RFA One launch vehicle is slated for 2025, which is also the revised estimate for a first orbital launch attempt. A launch license was granted by the Civil Aviation Authority on 16 January 2025, limiting the company to 10 launches per year as well as no more than two in any given month, and requires 60 days' notice for range safety purposes.

List of launch plans

References

Illustrations

Worked examples

Example 1 — a first encounter with RFA One

Start with the simplest possible case. Write down what RFA One 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 RFA One 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 RFA One 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 RFA One

In research: RFA One 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 RFA One 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: RFA One is common in secondary-school and first-year university syllabi. It links to neighbouring topics Expendable space launch systems, Private space launch vehicles, Space launch vehicles of Germany, so understanding it makes those chapters shorter.
In everyday life: Look for RFA One 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 RFA One in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RFA One 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 RFA One out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RFA One in simple terms?

Why does RFA One 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 RFA One?

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 RFA One.