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A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.
A scissor jack use the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for a modern vehicle and the notch fits into a jack-up point [3] on a unibody. Earlier versions ...
For example, rock can weigh between 150-175 lb; [2] a suitable rip-rap boulder comparable to a 96 inch A-Jacks unit (about 36 c.f.) would weigh about 5800 pounds, about 16% more than the A-Jacks unit. A-Jacks also have the advantage of being interlocking and self-stabilizing.
The basic function of a trailer jack is to lift the trailer to a height that allows the trailer to be hitched or unhitched to and from the towing vehicle. Trailer jacks are also used for leveling the trailer during storage. The most common types of trailer jacks are A-frame jacks, swivel jacks, and drop-leg jacks.
Subsequent airplane nose down stabilizer trim motion from 7.0 degress ANU to 2.0 degrees ANU was due to the use of primary trim. Stabilizer motion from 2.0 degrees ANU to 0.4 degrees AND was commanded by the autopilot. The horizontal stabilizer jammed at 0.4 degrees AND and remained jammed until the Acme nut threads failed.
Scholars show how multiple planet movements tie into the 819-day Mayan calendar. The 819 days of the calendar must be viewed across a 45-year time period to fully understand.
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