Re: Max Service ceiling for commercial airplanes
Bertie the Bunyip
news:d6cd3158-6cb0-4ffd...@m34g2000hsf.googlegroups.com:
> On Jan 30, 3:48 pm, Bertie the Bunyip <T...@ld.you> wrote:
>> D Ramapriya <d.ramapr...@gmail.com> wrote
>> innews:2690baef-0857-4600-a0c5-4
> 26a1d...@n20g2000hsh.googlegroups.com:
>>
>> > On Jan 30, 2:33 pm, Bertie the Bunyip <T...@ld.you> wrote:
>> >> D Ramapriya <d.ramapr...@gmail.com> wrote
>> >> innews:24252c28-895a-44da-bd25-
>>
>> 662f25fa3...@v4g2000hsf.googlegroups.co
>>
>>
>>
>>
>>
>> >> m:
>>
>> >> > On Jan 30, 2:08 pm, Bertie the Bunyip <T...@ld.you> wrote:
>> >> >> D Ramapriya <d.ramapr...@gmail.com> wrote in
>> >> >> news:2ff47125-cffd-4909-b028-
>> >> >> 93288fe9a...@s12g2000prg.googlegroups.com:
>>
>> >> >> > On Jan 30, 8:41 am, WingFlaps <Morefl...@gmail.com> wrote:
>> >> >> >> On Jan 30, 2:03 pm, girish....@gmail.com wrote:
>>
>> >> >> >> > Out of curiosity I was wondering which civilian passenger
>> >> >> >> > airplanes have the highest service ceilings? Wikipedia
>> >> >> >> > indicates that some business jets have ceilings greater
>> >> >> >> > than 53000 ft or so while the 747 has only 43000 ft. Also
>> >> >> >> > why do large aircraft fly much lower than their service
>> >> >> >> > ceilings? Usually I never see a large jet go beyond 37000
>> >> >> >> > or so even on very long haul flights. I assume they would
>> >> >> >> > be even more efficient if they flew close to service
>> >> >> >> > ceilings on long haul flights.
>>
>> >> >> >> Could be due to weight? When you fly across the Pacific the
>> >> >> >> plane can only get higher as fuel is burned.
>>
>> >> >> > Get higher? I thought that's what the continual small
>> >> >> > adjustments effected by the trim wheels do to preclude,
>> >> >> > especially with the AutoPilot engaged?
>>
>> >> >> Huh?
>>
>> >> >> Bertie
>>
>> >> > I meant to say that the AP will ensure that you keep flying at
>> >> > the programmed altitude (through trim and throttle changes)
>> >> > instead of letting the plane go higher with diminishing weight.
>> >> > Have I missed something?
>>
>> >> We get cleared to an altitude and have to hold that altitude to
>> >> avoid running into other airplanes. The autopilot does not just go
>> >> where it pleases.
>>
>> > My point exactly,
>>
>> No, it wasn't. you said that the AP will ensure that you keep flying
>> at the programmed altitude throught trim and throttle changes.
>> It won't.
>
>
> So the AP's FD Altitude Controls do what?
The FD and the autopilot are two different things.
Bertie
D Ramapriya
> D Ramapriya <d.ramapr...@gmail.com> wrote innews:d6cd3158-6cb0-4ffd...@m34g2000hsf.googlegroups.com:
>
>
> >> >> We get cleared to an altitude and have to hold that altitude to
> >> >> avoid running into other airplanes. The autopilot does not just go
> >> >> where it pleases.
>
> >> > My point exactly,
>
> >> No, it wasn't. you said that the AP will ensure that you keep flying
> >> at the programmed altitude throught trim and throttle changes.
> >> It won't.
>
> > So the AP's FD Altitude Controls do what?
>
> The FD and the autopilot are two different things.
>
> Bertie
Fair enough but I was talking (loosely, admittedly) of what the AFDS
commands and gets done.
Ramapriya
Bertie the Bunyip
> On Jan 30, 6:11 pm, Bertie the Bunyip <A...@AA.AA> wrote:
>> D Ramapriya <d.ramapr...@gmail.com> wrote
>> innews:d6cd3158-6cb0-4ffd-927c-5
> 9ca49...@m34g2000hsf.googlegroups.com:
>>
>>
>> >> >> We get cleared to an altitude and have to hold that altitude to
>> >> >> avoid running into other airplanes. The autopilot does not just
>> >> >> go where it pleases.
>>
>> >> > My point exactly,
>>
>> >> No, it wasn't. you said that the AP will ensure that you keep
>> >> flying at the programmed altitude throught trim and throttle
>> >> changes. It won't.
>>
>> > So the AP's FD Altitude Controls do what?
>>
>> The FD and the autopilot are two different things.
>>
>> Bertie
>
>
> Fair enough but I was talking (loosely, admittedly) of what the AFDS
> commands and gets done.
>
Uh, no you weren't
You were talking about what you imagine they do based on what you've
read in the latest issue of "Take Off!"
Get the litle Spitfire finished yet?
Bertie
D Ramapriya
> D Ramapriya <d.ramapr...@gmail.com> wrote innews:efc9979a-39c2-404c...@e6g2000prf.googlegroups.com:
>
>
>
>
>
> > On Jan 30, 6:11 pm, Bertie the Bunyip <A...@AA.AA> wrote:
> >> D Ramapriya <d.ramapr...@gmail.com> wrote
> >> innews:d6cd3158-6cb0-4ffd-927c-5
>
> >> >> >> We get cleared to an altitude and have to hold that altitude to
> >> >> >> avoid running into other airplanes. The autopilot does not just
> >> >> >> go where it pleases.
>
> >> >> > My point exactly,
>
> >> >> No, it wasn't. you said that the AP will ensure that you keep
> >> >> flying at the programmed altitude throught trim and throttle
> >> >> changes. It won't.
>
> >> > So the AP's FD Altitude Controls do what?
>
> >> The FD and the autopilot are two different things.
>
> >> Bertie
>
> > Fair enough but I was talking (loosely, admittedly) of what the AFDS
> > commands and gets done.
>
> Uh, no you weren't
>
> You were talking about what you imagine they do based on what you've
> read in the latest issue of "Take Off!"
>
> Get the litle Spitfire finished yet?
>
> Bertie
Try and stop projecting, Bertie.
Ramapriya
Bertie the Bunyip
> On Jan 30, 6:36 pm, Bertie the Bunyip <A...@AA.AA> wrote:
>> D Ramapriya <d.ramapr...@gmail.com> wrote
>> innews:efc9979a-39c2-404c-8460-9
> 0b9b4...@e6g2000prf.googlegroups.com:
>>
>>
>>
>>
>>
>> > On Jan 30, 6:11 pm, Bertie the Bunyip <A...@AA.AA> wrote:
>> >> D Ramapriya <d.ramapr...@gmail.com> wrote
>> >> innews:d6cd3158-6cb0-4ffd-927c-5
>> > 9ca49abd...@m34g2000hsf.googlegroups.com:
>>
>> >> >> >> We get cleared to an altitude and have to hold that altitude
>> >> >> >> to avoid running into other airplanes. The autopilot does
>> >> >> >> not just go where it pleases.
>>
>> >> >> > My point exactly,
>>
>> >> >> No, it wasn't. you said that the AP will ensure that you keep
>> >> >> flying at the programmed altitude throught trim and throttle
>> >> >> changes. It won't.
>>
>> >> > So the AP's FD Altitude Controls do what?
>>
>> >> The FD and the autopilot are two different things.
>>
>> >> Bertie
>>
>> > Fair enough but I was talking (loosely, admittedly) of what the
>> > AFDS commands and gets done.
>>
>> Uh, no you weren't
>>
>> You were talking about what you imagine they do based on what you've
>> read in the latest issue of "Take Off!"
>>
>> Get the litle Spitfire finished yet?
>>
>> Bertie
>
>
> Try and stop projecting, Bertie.
Yeah, an IKYABWAI poast.
That'll fool 'em.
Bertie