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In the Name of God بسم الله

Test Question

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A few days ago, l Iistened to this entire video. l even took a nap with this on.

Reminded me of my youth. l started ploughing with one of these when l was eight, pulling 3-14s.

This is both relaxing and exhilarating at the same time.

Since S.C has people into science and engineering, l have a test question.

Condition: The Model A is left to idle on its own.

Observation: Periodically, the rpms drop.

Video:  https://www.youtube.com/watch?v=ezE4DV_EIDU     lf there is a link problem, Search: 9 Hours of John Deere Model A Farm Tractor Engine Sound

Question: You hear the rpms drop at 4:30 to 4:50 plus. Then return to normal.   Why ?

.              (Hint: The engine is not "hunting" as older engines sometimes did. ('Hunting' does still occur in large electric motors) )

Edited by hasanhh
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