science

Massey-Harris Model 81

Massey-Harris Model 81 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 Massey-Harris Model 81 rather than just read about it. In short: The Massey-Harris Model 81 was a two-plow small-farm tractor built by Massey-Harris (later Massey Ferguson) from 1941 to 1948. Introduced to replace Massey's General GG, the 81 was paired with the Model 82 (which used kerosene, or tractor vaporizing oil {TVO}, as it was known in Britain) and was very similar to the Model 101 Junior, which first appeared in 1939.

Key takeaways

Massey-Harris Model 81 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Massey-Harris Model 81 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Massey-Harris Model 81 from memory before moving on to harder problems.

Reference excerpt

The Massey-Harris Model 81 was a two-plow small-farm tractor built by Massey-Harris (later Massey Ferguson) from 1941 to 1948. Introduced to replace Massey's General GG, the 81 was paired with the Model 82 (which used kerosene, or tractor vaporizing oil {TVO}, as it was known in Britain) and was very similar to the Model 101 Junior, which first appeared in 1939. It was offered in standard-tread and row-crop versions, as was the Model 20 that followed it. The Model 81 was joined in 1946 by the Model 20, both of which survived in production until 1948.

Pricing With a base price of around C$800, it was competitive with the C$900 John Deere A. and less than Ford and Ferguson-Brown models of the period.

Weight The bare weight without ballast was 2,600 lb (1,170 kg), some 1,100 lb {580 kg} less than the contemporary Model 30.

Engines The 81 used the same 124 in3 (2,031 cc) engine of the 101 Junior, while the 82 used a 140 in3 (2,293 cc) model. The 124 in3 was rated at 21 hp (15.7 kW) at the belt, and was manufactured by Continental, like all Massey-Harris tractors at the time.

Use by Royal Canadian Air Force The Royal Canadian Air Force used blue-painted standards as aircraft tugs, out of under 2,600 standard-tread 81s made.

References

Sources Pripps, Robert N. (2001). The big book of Massey tractors. Vancouver: Raincoast Books. ISBN 1-55192-423-4. OCLC 46991918.

Further reading Pripps, Robert N. The Big Book of Farm Tractors. Vancouver, BC: Raincoast Books, 2001. ISBN 1-55192-393-9. ______. The Field Guide to Vintage Farm Tractors. Stillwater, MN: Voyageur Press, 2001. ______. Vintage Ford Tractors. Stillwater, MN: Voyageur Press, 2001. Denison, Merrill. Harvest Triumphant: The Story of Massey-Harris. New York: Dodd Mead, 1949. Farnsworth, John. The Massey Legacy. Ipswich, Great Britain: Farming Press, 1997. Gay, Larry. Farm Tractors 1975-1995. Saint Joseph, MI: American Society of Agricultural Engineers, 1995. Wendel, C. H. Massey Tractors. Osceola, WI: Motorbooks International, 1992.

Illustrations

Worked examples

Example 1 — a first encounter with Massey-Harris Model 81

Start with the simplest possible case. Write down what Massey-Harris Model 81 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 Massey-Harris Model 81 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 Massey-Harris Model 81 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 Massey-Harris Model 81

In research: Massey-Harris Model 81 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 Massey-Harris Model 81 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: Massey-Harris Model 81 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Agriculture stubs, Massey-Harris vehicles, Tractors, so understanding it makes those chapters shorter.
In everyday life: Look for Massey-Harris Model 81 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 Massey-Harris Model 81 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Massey-Harris Model 81 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 Massey-Harris Model 81 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Massey-Harris Model 81 in simple terms?

Why does Massey-Harris Model 81 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 Massey-Harris Model 81?

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 Massey-Harris Model 81.