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The ArduPilot project earliest roots date back to late 2007 [10] when Jordi Munoz, who later co-founded 3DRobotics with Chris Anderson, wrote an Arduino program (which he called "ArduCopter") to stabilize an RC Helicopter. In 2009 Munoz and Anderson released Ardupilot 1.0 [11] (flight controller software) along with a hardware board it could ...
Today sailors still use the unit of knots to express a ship's speed. The speed of the ship was needed to navigate the ship using dead reckoning, which was standard practice in the days before modern navigation instruments like GPS. During World War II, pitometer logs were often interfaced directly into warship fire control systems.
It is widely used to determine the airspeed of aircraft; [3] the water speed of boats; and the flow velocity of liquids, air, and gases in industry. Theory of operation [ edit ]
A navigator who needed to know the speed of the vessel had a sailor drop the log over the ship's stern. The log acted as a drogue , remaining roughly in place while the vessel moved away. The sailor let the log-line run out for a fixed time while counting the knots that passed over.
Some ships lack a remote control handle in the ECR. When in bridge control mode, the bridge handle directly controls the engine set point. When in Engine Control Room mode the bridge handle sends a telegraph signal to the ECR and the ECR handle controls the set point of the control system.
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The driver must manually bring the vehicle up to speed and use a button to set the cruise control to the current speed. The cruise control takes its speed signal from a rotating driveshaft, speedometer cable, wheel speed sensor from the engine's RPM, or internal speed pulses produced electronically by the vehicle. Most systems do not allow the ...
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