engineering

Obturator ring

Obturator ring is a engineering 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 Obturator ring rather than just read about it. In short: An obturator ring was a type of piston ring used in the early rotary engines of some World War I fighter aircraft for improved sealing in the presence of cylinder distortion. Purpose The cylinders of rotary aircraft engines (engines with the crankshaft fixed to the airframe and rotating cylinders) suffered from uneven cylinder cooling as the side facing the direction of rotation received more cooling air which led t…

Key takeaways

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

Reference excerpt

An obturator ring was a type of piston ring used in the early rotary engines of some World War I fighter aircraft for improved sealing in the presence of cylinder distortion.

Purpose The cylinders of rotary aircraft engines (engines with the crankshaft fixed to the airframe and rotating cylinders) suffered from uneven cylinder cooling as the side facing the direction of rotation received more cooling air which led to thermal distortion. To keep weight down the cylinders on rotary engines had very thin-walls (1.5 mm) and some had no cylinder liners. On engine types without cylinder liners, obturator rings, made of bronze in the early Gnome engines, were fitted as these were soft enough to not damage cylinder walls and could flex to the shape of the cylinder. In operation wear on the rings was considerable. Engines needed to be overhauled about every 20 hours. The reliability of Gnome engines license-built by The British Gnome and Le Rhone Engine Co. was improved with an overhaul life of about 80 hours being achieved, mainly as a result of using a special tool to roll the 'L' section obturator rings. Clerget rotary aircraft engines also used obturator rings which were prone to overheating and seizure. Le Rhône and Bentley BR1/BR2 rotary engines used cylinder liners and were sealed using conventional piston rings rather than obturator rings.

See also Piston ring Cannelure Gas check

References

External links An 'L' section obturator ring is shown in Patent US 1378109A - "Obturator ring".

Illustrations

Worked examples

Example 1 — a first encounter with Obturator ring

Start with the simplest possible case. Write down what Obturator ring claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Obturator ring 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 Obturator ring 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 Obturator ring

In research: Obturator ring appears in engineering 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 Obturator ring 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: Obturator ring is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aerospace engineering, Pistons, so understanding it makes those chapters shorter.
In everyday life: Look for Obturator ring 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 Obturator ring in 20 minutes

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

Frequently asked questions

What is Obturator ring in simple terms?

An obturator ring was a type of piston ring used in the early rotary engines of some World War I fighter aircraft for improved sealing in the presence of cylinder distortion. Purpose The cylinders of rotary aircraft engines (engines with the crankshaft fixed to the airframe and rotating cylinders)…

Why does Obturator ring matter?

Because it connects several engineering 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 Obturator ring?

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 Obturator ring.