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PHI - Position and Homing Indicator: Difference between revisions
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PHI - Position and Homing Indicator (view source)
Revision as of 21:30, 23 November 2020
, 23 November 2020→Technique
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The main documentation found on the net that technically describes the operation of the device is that of the PDF file: AD091920 aut. RL JEFFERIES year 1955 <ref name = "AD091920"/>. | The main documentation found on the net that technically describes the operation of the device is that of the PDF file: AD091920 aut. RL JEFFERIES year 1955 <ref name = "AD091920"/>. | ||
This device performance evaluation document gives a clear idea of how it was designed and the parts that make it up. Its reading is really useful and has allowed us to create a sufficiently real model for an instrument that has not been operational for at least 20 years. | This device performance evaluation document gives a clear idea of how it was designed and the parts that make it up. Its reading is really useful and has allowed us to create a sufficiently real model for an instrument that has not been operational for at least 20 years. | ||
===Programming the routes=== | |||
Programming The instrument allows you to sequentially follow up to 5 routes stored in the '' Station Selector '' (unit with the code NCU located to the right of the pilot). A route consists of two values: N-S and E-W coordinates measured in air miles of the next point <ref name = "AD091920"/>. The SS allowed the insertion of a box containing 4 multiturn resistors (10 turns) to enter the distance N-S and other 4 multiturn resistors to enter the distance E-W. Once the route was planned, the navigator made a list of max. 5 pairs of coordinates, the first pair was not inserted into the device, but only communicated to the pilot, who set it on the display, the other 4 were set by a technician using a special programming device and a screwdriver that turned the potentiometers placed on the programming box. The cassette could be inserted into the compartment with a light pressure and extracted using the '' release '' button <ref>The '' release '' button in the G91R1B works, and then ejects/retracts the program cassette.</ref> dell NCU unit.<br>Programming The instrument allows you to sequentially follow up to 5 routes stored in the '' Station Selector '' (unit with the code NCU located to the right of the pilot). A route consists of two values: N-S and E-W coordinates measured in air miles of the next point <ref name = "AD091920"/>. The SS allowed the insertion of a box containing 4 multiturn resistors (10 turns) to enter the distance N-S and other 4 multiturn resistors to enter the distance E-W. Once the route was planned, the navigator made a list of max. 5 pairs of coordinates, the first pair was not inserted into the device, but only communicated to the pilot, who set it on the display, the other 4 were set by a technician using a special programming device and a screwdriver that turned the potentiometers placed on the programming box. The cassette could be inserted into the compartment with a light pressure and extracted using the '' release '' button <ref> The '' release '' button in the G91R1B works, and then ejects / retracts the program cassette. </ref> dell NCU unit. <br> In the simulation, as you will see later, the two coordinates have been replaced by a distance and an angle (heading), with respect to the geographic North. In this way it is possible to quickly integrate the polar coordinate programming method of the routes obtained from the route manager of the FGFS program with the N-S and E-W system used by the PHI. | |||
===Parts constituting the apparatus=== | ===Parts constituting the apparatus=== | ||