Hectopascals
 

So, the Hectopascal is upon us.

Does anyone else find this change in pressure units strange and unnecessary? If nothing else, it's a longer word and doesn't flow quite so well over the radio.

Not to mention the conversion charts you need to go from HPa to mbar. Another piece of paper to clutter the cockpit.

Inches are so much easier.... but hey we never use the term anyway.

QNH one zero two zero

what could be terser? what's the fuss?

Generally when the pressure is below 1000, the ATC then finish by saying the unit.

In todays case

niner niner seven hectopascals

I thought in the world of the met office, its always been hPa. The name changed when published for aviation/naval reporting purposes.

Edit: also the reason for ATC stating the unit when the pressure falls less than 1000 (one thousand hPa/mb), is due to the ambiguity between 997 and _9.97In Hg (29.97 inches if the first '2' is clipped or missed).

I guess Jan is used to flying round with high pressure.

Must be that famous Belgian high!

:rolleyes:

Obligatory joke:

Oh those Americans definitely like it in inches ;)

Just waiting for them to bring in milliatmospheres - that would roll off the tongue nicely AND be a boost to the economy with all the new altimeters required. Or Torr (mmHg) would be a good compromise - the mercury would keep them happy on one side of the atlantic and mm keeps them happy on the other side and in the rest of the world.

Sad to see the old mb go.

Cranfield tower seemed to take great delight in saying hectopascals at every opportunity today. With just a tiny pause to make you wonder if they were going to say it this time "QFE niner niner eight...........hectopascals".

Here in northern Thailand they give the initial reading in hPa, but when asked they give you the reading in Hg as well as they have both data on their screens.

"Another piece of paper to clutter the cockpit"

erm... hoping you're joking!!

I'm sure he's joking. Everyone knows that a paper conversion chart wouldn't be nearly accurate enough for something like this.

True. You're better off doing the conversion on an E6B, although I think IO540 will be along shortly explaining that using a GPS is better...:ok:

What amuses me most is that just as we are wrapping our tongues around a new, SI/PC phrase, the Russians are busy changing from metric to imperial units for altitude.

... some of us Luddites are still fighting a (losing) rearguard action for poundals and slugs ... perhaps I should champion the cheval ?

Let me get this straight - the UK has changed from measuring air pressure in milliBars, to measuring in Hectopascals... which are identical... and you people are complaining about it?

This is an absolute complete non-issue!

Coo! Meta-irony, I'm not sure I can cope. I need a lie down ;)

H