I have read somewhere that pilots will not engage vnav on the 777 at low altitudes on the climb due to excessive vertical speed. They were saying they use v/s to manage the rate.

Let's all say it together:

 

"Vertical speed does not matter."

 

 

 

Yeah. I agree that watching Kyle's video(s) will give you a good insight. It is hard for me to list all of the differences of the NG vs 777 so I really suggest the video(s).  I also think that Kyle should continue to make tutorials as he seems to be able to articulate everything in a fashion that everyone can understand

 

Thanks!  I'll continue making things for people as long as things keep getting requested!

The most discomfort you're likely to feel as a pax from excessive vert speed is gonna be ears popping 3-4 times a minute instead of 1-2, especially when the pressurisation is catching up. The only time you're likely to feel g force is just after takeoff when (if) full climb power is set and your airspeed is increasing, and maybe level off to cruise (neg g, might not even feel it if you're not paying attention).

The most discomfort you're likely to feel as a pax from excessive vert speed is gonna be ears popping 3-4 times a minute instead of 1-2, especially when the pressurisation is catching up. The only time you're likely to feel g force is just after takeoff when (if) full climb power is set and your airspeed is increasing, and maybe level off to cruise (neg g, might not even feel it if you're not paying attention).

 

Bingo!

The most discomfort you're likely to feel as a pax from excessive vert speed is gonna be ears popping 3-4 times a minute instead of 1-2, especially when the pressurisation is catching up. The only time you're likely to feel g force is just after takeoff when (if) full climb power is set and your airspeed is increasing, and maybe level off to cruise (neg g, might not even feel it if you're not paying attention).

 

And maybe too high of a pitch angle? 

And maybe too high of a pitch angle? 

Not really, think about a lift. A lift travels vertically so the pitch angle is effectively 90 degrees to the horizon. At what point do you feel g force? Only during the part where it's speed is increasing from stationary. You don't feel anything you wouldn't feel standing flat on a floor when it's moving upwards at a constant speed.

 

G force is related to acceleration, once stable at a given pitch angle there is no acceleration in the vertical component. And none in the lateral component unless the ground speed is increasing.

 

I hope that explains it, last time i studied Physics was a good number of years ago now!

And maybe too high of a pitch angle? 

 

Maybe, but they're not going to be able to tell the difference between 15 and 25 unless they fly all the time.  Again, it wouldn't be a comfort factor, either, as long as you're maintaining speed (higher deck angle plus decreasing speed could give them a weird feeling).

 

 

Thanks! I'll continue making things for people as long as things keep getting requested!

Yes Kyle. Please continue making videos when time allows. They're very informative and comprehensible.  Great delivery and high style points for you in the first one.

 

Brian G

Yes Kyle. Please continue making videos when time allows. They're very informative and comprehensible.  Great delivery and high style points for you in the first one.

 

Thanks Brian!  I just have to keep finding things to show off.  Not too much to show off once the plane comes out!

 

 

You can use the Flex temp, to cut some power on the Engines

Jason

 

I not aware of anything on the market right now that would give you an assumed or flex temperature like TOPCAT does for the MD-11. It would just be a guessing game unless the FCOMs have some charts that could be used for this purpose. 

 

Michael Cubine

I don't think the FCOM contains this kind of information. The FPPM (Flight Planning and Performance Manual) should... But I very highly doubt it will come with the 777.

And maybe too high of a pitch angle? 

 

Maybe a little when you are in your seat. During climbout the Seatbeltsign is most likely to be turned on so you should be in your seat and in your seat, high pitch angles (not much greater than 25 degrees or so, which is not really much) don't really discomfort, while seated that is.

 

EDIT: Question got answered multiple times while i was writing. Sorry!

 

 

It would just be a guessing game unless the FCOMs have some charts that could be used for this purpose. 

 

If I remember correctly, there are, but it's not like they're tables for specific runways/airports.  Generic, but they'll get the job done if you know how to use them.

But from a cabin crew member point of view a high pitch angle does make a big difference, trying to maneuver trollies through the aisles. Not to mention all those passengers' preflight drinks that get thrown into their laps because they slide of the tray tables. It's not only what you feel that defines the comfort on an airplane ;-)

 

 

But from a cabin crew member point of view a high pitch angle does make a big difference, trying to maneuver trollies through the aisles.

 

You're not going to do drink service that early.

 

 

 

Not to mention all those passengers' preflight drinks that get thrown into their laps because they slide of the tray tables. It's not only what you feel that defines the comfort on an airplane ;-)

 

What airline do you work for that allows the tray tables or preflight drinks to still be out during takeoff?

 

That's a bit of a stretch...