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No, David! is a 1998 children's picture book written and illustrated by David Shannon and published by Scholastic Inc. Shannon wrote a story by himself at five years old, and later in his life, he found this story and decided to publish it after re-writing this original work.
The Hotchkiss drive uses two universal joints, which has the effect of canceling the speed fluctuations and gives a constant speed even when the shaft is no longer straight [citation needed]. V8-powered models of the 1963 through 1966 AMC Rambler used a double-Cardan constant velocity joint to eliminate driveshaft fluctuations, though six ...
The Cardan joint suffers from one major problem: even when the input drive shaft axle rotates at a constant speed, the output drive shaft axle rotates at a variable speed, thus causing vibration and wear. The variation in the speed of the driven shaft depends on the configuration of the joint, which is specified by three variables:
Stiffness of the shaft and its support; Total mass of shaft and attached parts; Unbalance of the mass with respect to the axis of rotation; The amount of damping in the system; In general, it is necessary to calculate the critical speed of a rotating shaft, such as a fan shaft, in order to avoid issues with noise and vibration.
When an element of mass is offset from the axis of rotation, centrifugal force will tend to pull the mass outward. The elastic properties of the shaft will act to restore the “straightness”. If the frequency of rotation is equal to one of the resonant frequencies of the shaft, whirling will occur. In order to save the machine from failure ...
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There is no longer a drive shaft between them and so the notion of "direct drive" is inapplicable. Although "overdrive" is still referred to, this is now mostly a marketing term to refer to any extra-high ratio for efficient cruising, whether it is achieved through the gearbox ratios, or by an unusually high final drive.
David continued to host and produce the show until the end of the 2005 season, when he chose to pursue, in his own words, "other opportunities". On March 31, 2007—and a bit before that for his loyal fan base—the meaning of "other opportunities" was revealed as a new show called Stacey David’s GearZ , airing on ESPN2 .