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-   -   Question about a VOR (https://www.pprune.org/private-flying/555836-question-about-vor.html)

tecman 3rd Feb 2015 13:04

Interesting re Canada, and vaguely recall an article about FAA IFR track revision to account for changes in variation. Can't remember the outcome but maybe one of the US posters knows the result. I'm assuming that this will all be very second order to the OP :)

foxmoth 3rd Feb 2015 13:38

Another thing to consider here is the distance - the OP stated the VOR is

BlueJays - At the airport
,

But he does not say WHICH airport, with a VOR at both ends and a distance of (say) 120nm you will initially want to track OUTBOUND on the departure VOR on the 200 radial, this is because you will be out of range of your destination, heading will be 200 as no wind. depending on height you will lose the first VOR due to range, when within range of the destination VOR you then want to track inbound on the 020 radial (OBS at the top on 200 though, still tracking and heading 200). You may actually find though that when you pick up the destination VOR, due to various factors, you are not actually ON the 020 radial - you then have two choices - centre the needle and fly inbound on whatever radial you are actually on, or fly L/R to centre the needle and fly inbound on the 020 Radial. Also note that if you follow a radial outbound to get somewhere errors in the system may mean you are L/R of track when you get there, obviously the further away from the VOR that you are the larger the off track error - you can be looking at up to 5 degrees or even more, though this is rare, so 60nm from the VOR you could be 5 miles off track!

glendalegoon 3rd Feb 2015 13:52

Dear ORIGINAL POSTER:


I would like you to think about this. It might help you understand.


The VOR extends 360 roads. And you name the roads by the numbers/degrees.

The trouble is you can go two ways on each of these roads .

(FOR EXAMPLE. Down near Los Angeles, California there is a road called 101. IF you are in Santa Barbara (about 90 miles west/northwest of Los Angeles ) You can get on 101 and if you are going in one direction upon it you will go to Los Angeles, but if you are on the same road , in the other direction you will get To San Francisco...same name of the road, different direction)


So, if you are going to an airport that has a VOR upon it and it is the only VOR you are using. YOU ARE ON THE 20 degree road, but going on the 200degree direction on that road. And in no winds, your heading will be 200 degrees and you should select 200 degrees in the OBS (omni directional bearing selector).

Now, sustitute radial for road.



There are other terms you really must learn.


RADIALS

COURSE (everyone uses the term ground track and I don't like it, course is the better term)

Heading (and the VOR doesn't care what heading you are on)

BEARING TO

BEARING FROM


Get out a piece of paper and pencil and draw it until you can explain it somehow to someone else.

thing 3rd Feb 2015 14:30


I believe VOR's in northern Canada & Alaska are based on True N due to the rapid changes of variation because of proximity to the mag N pole and all that...
Apologies. I'm being very parochial and thinking everyone is flying in UK, I must remember it's called the World Wide Web for a reason...:)


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