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The centrifugal clutch expands with increasing speed, engaging a drum. On this drum sits either a fixed sprocket or an exchangeable one. The clutch has three jobs: When the engine runs idle (typically 2500–2700 rpm) the chain does not move. When the clutch is engaged and the chain stops in the wood for another reason, it protects the engine.
Auger, a straight shaft with a wood-cutting blade at the bottom and a T-shaped handle; Brace, a modified auger powered by means of a crankshaft; Gimlet, a small tool for drilling holes; Bradawl, similar to a screwdriver but with a drilling point; Cranial drill, an instrument used throughout skull surgery
The collective changes the pitch angle of all the main rotor blades collectively (i.e., all at the same time) and is independent of their position in the rotational cycle. Therefore, if a collective input is made, all the blades change equally, and as a result, the helicopter increases or decreases its total lift derived from the rotor.
The revised rear styling did not change the 14.1 cubic ft trunk space of the 1969 model. 14-inch wheels became standard equipment, and the 170 cu in (2.8 L) slant-6 was replaced by a larger 198 cu in (3.2 L) version for improved base-model performance and greater manufacturing economy—the 198 used the same block as the 225, while the 170 had ...