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In the examples for close-hauled and reach (left and right), the sail's angle of attack (α) is essentially constant, although the boom angle over the boat changes with point of sail to trim the sail close to the highest lift force on the polar curve.
A rudder angle indicator is a device used to indicate the present position of the rudder blade, usually fitted near the Ship's wheel on the bridge and in the engine control room. [ 1 ] Rudder angle indicator of the MS Nordstjernen (1956) Rudder angle indicator
An air data boom provides air pressure, temperature, and airflow direction data to data acquisition systems for the computation of air, ground, and water vehicle orientation, speed, altitude/depth, and related information. Air data booms can be used as primary sensors or as a "measurement standard" of which primary sensors and instruments are ...
A variation of the yaw string is the side string, used in gliders for a determination of the angle of attack. In this way the speed for best glide angle, the best thermalling speed and the stall speed can be observed independently of other parameters like air speed, aircraft weight, acceleration due to turning, stick movements, and gusts. [18]
The SLI measures the angle and extension of the boom along with the load weight and compares this with the manufacturer's specifications to determine if the lift is safe. [ 2 ] A safe load indicator has the capability of detecting the angle, weight of load lifted, and ground radius of any lifting device.
Guys, which control spar angle with respect to the apparent wind. Preventer, is cordage attached to the end of the boom and fixed to (or running through a block) on the rail athwart or forward of the mast. Its most common purpose is to prevent potentially dangerous movement of the spar in an accidental gybe.
A drift meter consists of a small telescope extended vertically through the bottom of the aircraft with the eyepiece inside the fuselage at the navigator's station. A reticle, typically consisting of spaced parallel lines, is rotated until objects on the ground are seen to be moving parallel to the vertical lines.
See turn coordinator and slip indicator. Monitoring the boom angle of cranes and material handlers. Measuring the "look angle" of a satellite antenna towards a satellite. Adjusting a solar panel to the optimal angle to maximize its output. Measuring the slope angle of a tape or chain during distance measurement.