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#1
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![]() "Dan Luke" wrote in message ... "Casey Wilson" wrote: Learn and use a VOR the way it was designed: as an instrument which tells you your *position*, *not* your course line, and you'll never have a problem with reverse sensing. No, with one exception, it does not tell you your position. That single exception is when you overfly the antenna. No. One may use a VOR receiver and CDI to compute one's position by flying perpendicular to a radial, timing the observed deflection, and applying a simple formula. In which case the VOR did NOT give you your position. The calculation required additional instruments: A timer and some device (compass or DG) to fly perpendicular to a radial, not to mention the use of the ASI, and so forth. I say again, the VOR did NOT give you your position. By the way, flying perpendicular to one radial is NOT perpendicular to the next, so the calculation is flawed. |
#2
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![]() "Casey Wilson" wrote: In which case the VOR did NOT give you your position. The calculation required additional instruments: A timer and some device (compass or DG) to fly perpendicular to a radial, not to mention the use of the ASI, and so forth. Silly hair splitting. You also said the VOR will give you bearing from the station: how will it do that without the use of other equipment? -- Dan C172RG at BFM |
#3
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Student here, following debate with interest but I don't understand the
issue at disagreement. Considering "bearing" as distinct from "relative bearing", is not the bearing the clockwise angular direction with respect to the meridian over its origin of a line drawn from one point to another? And since the 0 radial of the VOR station is aligned to the magnetic meridian, each VOR radial indicates directly the magnetic bearing from the VOR station to an object that lies somewhere along it. To get one's bearing from the VOR station, than, can you not just rotate the OBS until the needle is centred? If the "from" flag is up then the OBS ring reads out directly the magnetic bearing to the aircraft as viewed from the VOR station, and if the "to" flag is up, the OBS is showing the reciprocal. So don't you know you're somewhere along that line? Of course, neither indication gives the actual aircraft position without using some other additional means to establish distance from the station - DME, triangulation on another station, etc. Same principle with a movable card ADF set to or slaved to one's compass heading, except that its needle is always indicating the bearing to whatever station that's tuned so one needs to convert that reading into the radial bearing from the station of interest to the plane (I know that the conversion assumes the magnetic variation at the plane's position is not different from that at the station's position, if you want to get precise). "Dan Luke" wrote in message ... "Casey Wilson" wrote: In which case the VOR did NOT give you your position. The calculation required additional instruments: A timer and some device (compass or DG) to fly perpendicular to a radial, not to mention the use of the ASI, and so forth. Silly hair splitting. You also said the VOR will give you bearing from the station: how will it do that without the use of other equipment? -- Dan C172RG at BFM |
#4
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![]() "Steve House" wrote in message ... Student here, following debate with interest but I don't understand the issue at disagreement. Considering "bearing" as distinct from "relative bearing", is not the bearing the clockwise angular direction with respect to the meridian over its origin of a line drawn from one point to another? And since the 0 radial of the VOR station is aligned to the magnetic meridian, each VOR radial indicates directly the magnetic bearing from the VOR station to an object that lies somewhere along it. To get one's bearing from the VOR station, than, can you not just rotate the OBS until the needle is centred? If the "from" flag is up then the OBS ring reads out directly the magnetic bearing to the aircraft as viewed from the VOR station, and if the "to" flag is up, the OBS is showing the reciprocal. So don't you know you're somewhere along that line? Yes. That was my point exactly. Only, somewhere along that line could be anywhere within about a 200 square mile area when you factor in the inherent accuracy of the single VOR. Of course, neither indication gives the actual aircraft position without using some other additional means to establish distance from the station - DME, triangulation on another station, etc. Yes. That was my point exactly. |
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