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Message: <blockquote data-quote="fabianyee" data-source="post: 317534" data-attributes="member: 6">Actually after re-reading JOKER's first post, there is a fundamental flaw to equate the handgrip size of the screwdriver to the size of the shaft... Using the screwdriver analogy, what turns a screw is the torque applied immaterial which screwdriver is used... The magnitude of torque depends on three quantities: First, the force applied; second, the length of the lever arm connecting the axis to the point of force application; and third, the angle between the two.. Since the angle is the same so we can leave out the 3rd. So the bigger the grip, the force is applied further away from the axis (aka pivot). hence there's more torque applied compared to one with a small grip... However, u can't apply the same to the prop shaft because you don't turn the shaft by grabbing and twisting it. The turning force is coming from the crankshaft. that's the source of the 'twist'.. There is no difference in the length of the lever arm connecting the axis to the point of force application.And for my reasoning for the heavier flywheel in increasing torque, I should be more clear on it.. It doesn't increase the torque output but it retained the turning force better.. It's apparent when you're going up an incline using the same car with both a lightened flywheel and a stock weight flywheel. The one with the stock (heavier) flywheel can maintain its rev easier than the one with a lightened flywheel... I know cos I have my car both with a stock flywheel and lightened flywheel...</blockquote>

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