LDM #359: RAF Avro Vulcan Ground Position Indicator - MK.4 - Part 1 - Info and Reading Options

The Internet Archive:

This video presents the teardown of a vintage Ground Position Indicator which was used in Avro Vulcan aircrafts.<br />If someone knows something about this device please let me know, particularly the purpose of the various controls on the front panel.<br /><br />00:00 - Intro<br />03:54 - Teardown<br />05:16 - Disc & Ball integrator<br />07:33 - Latitude and Longitude computations<br />13:44 - Normal / Fix modes<br />15:16 - Synchronous motor<br />16:14 - Test with manual heading change<br />17:26 - Longitude-latitude simplified electro-mechanical diagram<br /><br />Notes:<br /> - At that time the goal of the third disc and ball integrator (on the bottom side) is unknown<br />- The goal of the motor linked to each output differential gear is unknown. I am not sure that they are used for wind correction (unlike in the PHI-4A navigation computer) because the velocity of the shaft of these motors is not controlled.<br />- The Lat/Lon are permuted in the simplified electro-mechanical diagram <br /><br />Latitude/Longitude computation:<br /><br />The latitude and longitude are computed using two disc and ball integrators. The disc of each integrator is linked to the same synchronous motor. The frequency of the signals which drive the motor must be proportional to the ground speed.<br />The input of the integrator (the displacement of the balls) is an image of the sine and the cosine of the heading. This is simply done using slides and levers linked to the heading shaft.<br />The angle of the output shaft is therefore an image of the integral of V(t)*sin(Theta(t)) and of V(t)*cos(Theta(t)), that is to say respectively the longitude and the latitude of the aircraft.<br /><br />Links:<br /><br />Dead reckoning on Wikipedia:<br />https://en.wikipedia.org/wiki/Dead_reckoning#:~:text=In%20navigation%2C%20dead%20reckoning%20is,course)%2C%20and%20elapsed%20time.<br /><br />Disc and ball integrator on Wikipedia:<br />https://en.wikipedia.org/wiki/Ball-and-disk_integrator<br />on YT:<br />https://www.youtube.com/watch?v=s1i-dnAH9Y4&t=1853s<br /><br />Other navigation computers on my channel:<br />https://youtu.be/cUOpCMj17Cw<br />https://youtu.be/cpOrcHsgwJY<br />https://youtu.be/TJI_owLNPZg<br /><br />Ball resolver:<br />https://youtu.be/SKPPBgBhxNs<br /><br />THE V-FORCE : 1955 to 1966<br />http://www.blackmanbooks.co.uk/navigation.html<br /><br />Book Computing mechanisms and Linkages by ANTONÍN SVOBODA (1965)<br />https://www.randomwraith.com/documents/Svoboda-ComputingMechanismsLinkages.pdf

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