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Thread: Level Ground - Oil Checks.

  1. #11
    Join Date
    Jan 1970
    Central West NSW
    Only place I have had to land and ask where I was was in PNG!

    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  2. #12
    trout1105's Avatar
    trout1105 is offline YarnMaster Silver Subscriber
    Join Date
    Jan 2017
    Geraldton WA
    When checking the fluids on your truck Regardless of how level your vehicle is you should be able to get a pretty good idea of how much oil you have in the engine, diffs and transfer case unless you are on a ridiculously steep bit of ground.
    The only time it is important to have the vehicle 'Level" is when doing fluid changes.
    Lets face it the Vast majority of drivers Never or hardly ever check the fluids on a regular basis anyway
    You only get one shot at life, Aim well

    2004 D2 "S" V8 auto, with a few Mods
    2007 79 Series Landcruiser V8 Ute, With a few Mods.
    5.4m Trailcraft Sportscab Boat
    20' Jayco Expanda caravan

  3. #13
    DiscoMick is offline AULRO Holiday Reward Points Winner!
    Join Date
    Jan 1970
    Quote Originally Posted by Eevo View Post
    told you the earth was flat
    Apparently it's not flat. Mind you, my eyes are so bad I couldn't tell anyway...

    The Earth has a radius of approximately 3965 miles. Using the Pythagorean theorem, that calculates to an average curvature of 7.98 inches per mile or approximately 8 inches per mile (squared). The distance to the horizon in miles from height of an observer is approximately equal to 1.23 times the square root of the height in feet. For example 1.23 times the square root of 8 divided by 12 equals 1 mile. Inversely given the horizon distance in miles, the height in feet required to be visible equals the distance in miles squared divided by 1.513. The second example above concerning the Moon rising over a distant range also requires some topographic map calculations using the tan trigonometric function. Thus if a peak rises up 1844 feet at a distance of 10.0 miles or 52,800 feet, it will form an angle of 2 degrees with a theoretical flat horizon. The tan is 1844/52800=0.0349 or 2 degrees. However due to the Earth's curvature, it would appear as though it was only 1778 feet tall with the lowest 66 feet below the horizon.
    Disregarding refraction, on a perfectly flat plain like the Bonneville Salt Flats in Utah, if one's eyes are 9 inches above the ground, one would be able to see at night a flashlight one mile distant laying on the surface but not if one lowers their eyes to 7 inches. For example per the above diagram, that might be between the tangent point and Object B.

    David Senesac Visual Line of Sight Calculations dependent on Earth's Curvature

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