Runway thresholds not 180 degrees reciprocal

[Sam Rutherford]

Sorry, slow evening!

I seem to remember a story of a long runway where, due to magnetic variation changes between the two thresholds, there was 190 degrees (and 170 degrees) between the allocated alignments.

Do I remember wrong? If not, is there just one or are there actually a few?

I suppose another option is if any bendy runways out there? I've landed on some bendy grass strips, but nothing in concrete (yet).

Have a nice evening! Sam.

[thing]

Never heard of a hard runway being different like that. They do change however as the mag var changes. Ours was 21/03 until a couple of years ago, it's now 20/02.

[John R81]

Redhill 07 / 25 has a bend but not 10 degree so reciprocal numbers.

[mad_jock]

I have landed on one like that but the runway was straight. The locals didn`t like the idea of landing on 13

[Them thar hills]

Breighton originally had only a piece of peri-track for a runway.
Very definitely curved. 29 and 10 approx.
This was in pre Real Aeroplane Company days...

[Blink182]

Stoke .... on the Isle of Grain

Runway there must have non-reciproical headings.....its shaped like a banana !

[Maoraigh1]

GLENFORSA on Mull had one set of numbers changed, but not the other end.

[Flap40]

Sobernheim in German Has a grass airfield just to the NE of the town centre which has a runway with a kink in the middle. From memory it is something like 03/20.

[chevvron]

There used to be one in the west midlands possibly Defford? I was told the ground survey gave different readings at each end so they had to designate the reciprocals slightly different.

[NorthSouth]

On an east-west oriented runway the runway orientation will always be slightly different at each end due to the effects of convergence. Check out any example from the AIP, e.g. Heathrow 09L/27R:

09L: 089.67 Degrees True
27R: 269.71 Degrees True

Not a lot in I grant you but it'll always be the case - and more evident the longer the runway is.

NS

[phiggsbroadband]

I suppose it would get really weird near the North Pole, or should
that be near the Magnetic North Pole.

[OhNoCB]

An immature and unrealistic part of me wants to see a runway centred on magnetic north pole with the orientation listed with reference to magnetic north. "Do you want 36 or 36 for departure, if you can accept departure from the intersection, 18 is available."

[Sam Rutherford]

After our trip to the geographic north pole in April, I can confirm that getting home from there is uncomfortable for the first 5 miles (as everywhere is 180 degrees! It is only as you move away that you actually get a useable indication!

For the original question, if I remember right it's a hard (long) runway somewhere in Alaska/Canada where it gets a large enough variation between the two thresholds to tip the balance into an non-reciprocal bearing. Think something like (example only) 274.9 degrees (RWY27) and 095.1 degrees (RWY10).

'later, Sam.