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As with all electronic oscillation, motorboating occurs when some of the output energy from an amplifying device like a transistor or vacuum tube gets coupled back into the input circuit of the device (or possibly into an earlier stage of the amplifier circuit) with the proper phase for positive feedback. This indicates there is an unwanted ...
Sailors stand lee helm and helmsman watch. Traditionally, two stations are on the bridge of a ship for controlling the vessel's maneuvers: the helm, which uses a wheel (or touchscreen equivalent) to send signals to control the position of the rudder or rudders, and the lee helm, which traditionally inputs speed commands by operating an engine order telegraph to send engine commands to the ...
Two-phase power can be derived from a three-phase source using two transformers in a Scott connection: One transformer primary is connected across two phases of the supply. The second transformer is connected to a center-tap of the first transformer, and is wound for 86.6% of the phase-to-phase voltage on the three-phase system.
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
The J/22's helm is quick and responsive-distinctly dinghy-like. The boat is fitted with the same rudder assembly as the larger J/24, which results in most positive steering, but the helm is not heavy or difficult even in heavy weather. Because the helm is so light, the boat accelerates well and scorches along downwind.
The Lightning is an American sailing dinghy that was designed by Olin Stephens of Sparkman & Stephens, as a one-design racer and first built in 1938. [1] [2] [3]An accepted World Sailing class, the boat is one of the most popular one-design sailing classes in the United States and is also raced in several other countries.
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A Laser 2 flying its spinnaker, with the crew on the trapeze. The Laser 2 is a sailing dinghy, built predominantly of fibreglass. It has a fractional sloop rig, a raked stem, a plumb transom, a transom-hung rudder controlled by a tiller with an extension and a retractable daggerboard. It displaces 170 lb (77 kg).