Someone correct me if i'm wrong, but is vertical g force associated with the rate of change of vertical speed (ie vertical acceleration) as opposed to the actual vertical speed/ pitch angle?

Performance tables are computed on a per runway basis. If you're flying into an airport you doin;t usually fly into and thus don;t have tables for, then the flight planning department will create specific figures for that flight only. If the runway should change, they need to re-compute for the new runway.

 

This is one area (of dozens) where MSFS is completely unreliable, and MUST NOT be even remotely considered accurate!!!!

 

Best regards,

Robin.

I work for an airline that doesn't do preflight drinks :-) but does release CCM after flaps up ... so we are in the cabin that early

Someone correct me if i'm wrong, but is vertical g force associated with the rate of change of vertical speed (ie vertical acceleration) as opposed to the actual vertical speed/ pitch angle?

 

g is not a force. g is a measure of acceleration as it relates to the vertical axis relative to the aircraft axis (in this case).

 

It is called g because g is specifically the vertical acceleration due to gravity relative to the surface of Earth. When you're sat in the office, you experience 1 g because you are always falling towards Earth, however on the ground the Earth is pushing back, so you "feel" gravity. In free-fall you experience 0 g until you reach terminal velocity, when you once again experience 1 g.

 

Note carefully the space between the value and the unit, too.

 

It's basic physics........ just what do they teach these days?!

 

Best regards,

Robin.

Someone correct me if i'm wrong, but is vertical g force associated with the rate of change of vertical speed (ie vertical acceleration) as opposed to the actual vertical speed/ pitch angle?

 

Correct, but your vestibular system can detect head angles (you can tell if you're lying down or standing up).  Different concept, though.  Not much of a comfort factor, really.  Like I mentioned earlier, it's not like most people would be able to tell the difference in pitch by that alone.

g is not a force. g is a measure of acceleration as it relates to the vertical axis relative to the aircraft axis (in this case).

 

It is called g because g is specifically the vertical acceleration due to gravity relative to the surface of Earth. When you're sat in the office, you experience 1 g because you are always falling towards Earth, however on the ground the Earth is pushing back, so you "feel" gravity. In free-fall you experience 0 g until you reach terminal velocity, when you once again experience 1 g.

 

Note carefully the space between the value and the unit, too.

 

It's basic physics........ just what do they teach these days?!

 

Best regards,

Robin.

 

I know it's a force per unit mass, it just gets abbreviated to g force doesn't it?

 

Correct, but your vestibular system can detect head angles (you can tell if you're lying down or standing up).  Different concept, though.  Not much of a comfort factor, really.  Like I mentioned earlier, it's not like most people would be able to tell the difference in pitch by that alone.

 

Yeah, makes sense.

I work for an airline that doesn't do preflight drinks :-) but does release CCM after flaps up ... so we are in the cabin that early

 

If your airline allows you to start taking trolleys out of their stowages after flaps up, I'd say it's time to start looking for a different employer

Some our flights are so short that the "cruise" portion only lasts 20 min or so. We don't have the comfort to wait until cruise to start the service. The rule is: service starts 10 min after take-off latest (unless weather or turbulence would be around obviously) Never had any problems with that though. Walking is just a bit more tiring

10 minutes and initial climb is quite a big difference. No matter what trolley you're pushing, you won't get it up the cabin (quite literally "up") during initial climb.

Some our flights are so short that the "cruise" portion only lasts 20 min or so. We don't have the comfort to wait until cruise to start the service. The rule is: service starts 10 min after take-off latest (unless weather or turbulence would be around obviously) Never had any problems with that though. Walking is just a bit more tiring

 

What airline serves drinks on a 20 minute flight?

We do a full (paying) service on all flights. LCC in Europe

Engine derating may not be required in order to reduce V/S.... but it's still done on the vast majority of airline flights... for cost saving reasons.

What airline serves drinks on a 20 minute flight?

American Eagle has done it before.

You'll see vs used a lot more in complicated terminal departures with altitude restrictions all over the place this way the pilots manage climb rather than vnav leveling off only to throttle back up to 4 to 6k ft/min , only to level off again, that's where the passengers get sick . Although I was on a short route on a 767 from ATL to JAX one time , it seemed half full , it was like riding a 45 minute roller coaster , hopefully the pilots were grinning.

 

Eric W

 

 

Correct, but your vestibular system can detect head angles (you can tell if you're lying down or standing up).  Different concept, though.  Not much of a comfort factor, really.  Like I mentioned earlier, it's not like most people would be able to tell the difference in pitch by that alone.

 

Still, that just measures direction (vs. size) of "force applied" vector. No way to tell whether you are accelerating or facing up (without outside reference).

 

 

 

If your airline allows you to start taking trolleys out of their stowages after flaps up, I'd say it's time to start looking for a different employer

I concur.

 

 

Some our flights are so short that the "cruise" portion only lasts 20 min or so. We don't have the comfort to wait until cruise to start the service. The rule is: service starts 10 min after take-off latest (unless weather or turbulence would be around obviously) Never had any problems with that though. Walking is just a bit more tiring

 

Flaps up occurs typically about 2 minutes into the flight. By 10 minutes into the flight, you are well past 10K and climbing steadily at a relatively low rate, more or less final cruising speed, somehwhere in 20s levels.

 

If you really do routinely pull up trolleys less than 5 minutes into the flight as you imply, let me know the name of your employer... I have been hit into knee by a trolley once, and it was not even a runaway tray. I don't want me being hit by a runaway, nor any of my co-traveller on aisle seat, and even less so one of the on-duty FAs.