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Title: LDM #359： RAF Avro Vulcan Ground Position Indicator - MK.4 - Part 1 Published on: 2024-02-26 Original video URL: https://www.youtube.com/watch?v=R07om0Zv3Qg

This video presents the teardown of a vintage Ground Position Indicator which was used in Avro Vulcan aircrafts. If someone knows something about this device please let me know, particularly the purpose of the various controls on the front panel. 00:00 - Intro 03:54 - Teardown 05:16 - Disc & Ball integrator 07:33 - Latitude and Longitude computations 13:44 - Normal / Fix modes 15:16 - Synchronous motor 16:14 - Test with manual heading change 17:26 - Longitude-latitude simplified electro-mechanical diagram Notes: - At that time the goal of the third disc and ball integrator (on the bottom side) is unknown - 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. - The Lat/Lon are permuted in the simplified electro-mechanical diagram Latitude/Longitude computation: 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. 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. 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. Links: Dead reckoning on Wikipedia: https://en.wikipedia.org/wiki/Dead_reckoning#:~:text=In%20navigation%2C%20dead%20reckoning%20is,course)%2C%20and%20elapsed%20time. Disc and ball integrator on Wikipedia: https://en.wikipedia.org/wiki/Ball-and-disk_integrator on YT: https://www.youtube.com/watch?v=s1i-dnAH9Y4&t=1853s Other navigation computers on my channel: https://youtu.be/cUOpCMj17Cw https://youtu.be/cpOrcHsgwJY https://youtu.be/TJI_owLNPZg Ball resolver: https://youtu.be/SKPPBgBhxNs THE V-FORCE : 1955 to 1966 http://www.blackmanbooks.co.uk/navigation.html Book Computing mechanisms and Linkages by ANTONÍN SVOBODA (1965) https://www.randomwraith.com/documents/Svoboda-ComputingMechanismsLinkages.pdf

Louise Michel était une anarchiste française très active dans la Commune de Paris de 1871. Son livre "La Commune" écrit en 1898 raconte ce qui s'y passa durant cette période. <br/>(Résumé par Enko) <br /><br />Louise Michel was a french anarchist very active during the Paris Commune of 1871. Her book "La Commune" written in 1898 describes what happened in that event. <br/>(Summary by Enko)