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((More citations needed|date=November 2022))
The '''Delco Carousel''' — proper name Carousel IV — was an [[inertial navigation system]] (INS) for aircraft developed by [[Delco Electronics]].<ref>((cite web | url=https://oceannavigator.com/plotting-lops-eight-miles-high | title=Plotting LOPs eight miles high - Ocean Navigator | date=January 2003 ))</ref> Before the advent of sophisticated flight management systems, Carousel IV allowed pilots to automate navigation of an aircraft along a series of waypoints that they entered via a control console in the cockpit.

Carousel IV consisted of an inertial measurement unit (IMU) as its position reference, a digital computer to compute the navigation solution, and a control panel mounted in an aircraft's cockpit. It was used for long over water and over the North Pole aircraft navigation. Many aircraft were equipped with dual or triple Carousels for redundancy.

Operation was relatively simple: a pilot or flight engineer would enter the individual waypoints by their latitude and longitude points and then the pilot or engineer would enter the starting location in latitude and longitude. The system used spinning mass gyroscopes and proof-mass accelerometers to measure movement from the start point. An involved calculation followed by sampling those sensors to determine a current position relative to the surface of the Earth.

The Carousel IV system derives its name from the fact that the inertial reference platform was rotated 360° every 60 seconds as a technique to reduce drift and increase accuracy by countering systematic errors. Low drift operation was aided by maintaining the gyroscopes and accelerometers at a constant temperature of 60&nbsp;°C. The elevated temperature was maintained when the aircraft was parked or undergoing maintenance.

During the 1982 Falklands war, RAF [[Avro Vulcan]]s were fitted with Carousels from RAF [[Vickers VC10]]s to enable [[Operation Black Buck]].<ref>((cite web | url=https://www.secretprojects.co.uk/threads/v-bomber-avionics-developments.12939/ | title=V-Bomber Avionics Developments? | date=10 June 2011 ))</ref>

==Applications==
*Military:  C-5A/B, KC-135 and its derivatives, C-141
*Missiles:  Thor IRBM, Titan II ICBM, Titan III heavy-lift launch system
*Spacecraft: Apollo Command Module (IMU only)
*Commercial:  Boeing 747, [[Vickers VC-10]]

==References==

((reflist))

[[Category:Avionics]]


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