Air speed   
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Marty1248

Usenet Poster
Marty1248@discussions.microsoft.com
Posted on:
Dec 20, 2007, 11:01 AM

Post #1 of 9 (34 views)
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Air speed Not logged in -   Reply 
Each time I attempt to go faster than 350 kts in a 747 I get the overspeed
warning. Does that sound correct? I was under the impression they flew faster.
Thanks!

Marty



Andy Hawkins

Usenet Poster
andy@gently.org.uk
Posted on:
Dec 20, 2007, 11:39 AM

Post #2 of 9 (34 views)
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Re: Air speed [In reply to Marty1248] Not logged in -   Reply 
Hi,

In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
Marty1248<Marty1248@discussions.microsoft.com> wrote:
> Each time I attempt to go faster than 350 kts in a 747 I get the overspeed
> warning. Does that sound correct? I was under the impression they flew faster.
> Thanks!

That's indicated airspeed. At high altitude, true airspeed is much higher
than indicated. Also, air speed != ground speed (check the ground speed
reading on the GPS sometime, and compare it to your air speed indicator.

Andy


Grand_Poobah

Usenet Poster
yoohoo@yaddayadda.com
Posted on:
Dec 20, 2007, 12:29 PM

Post #3 of 9 (34 views)
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Re: Air speed [In reply to Andy Hawkins] Not logged in -   Reply 
--->
> Hi,
>
> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>> Each time I attempt to go faster than 350 kts in a 747 I get the overspeed
>> warning. Does that sound correct? I was under the impression they flew faster.
>> Thanks!
>
> That's indicated airspeed. At high altitude, true airspeed is much higher
> than indicated. Also, air speed != ground speed (check the ground speed
> reading on the GPS sometime, and compare it to your air speed indicator.
>
> Andy

Yup. As you go higher, you have to keep reducing your autothrottle SPD
setting. Keep an eye on the GPS (as Andy says) and watch your
groundspeed increase as you decrease your SPD value.

GP



"seeker"

Usenet Poster
seeker@youwhish.com
Posted on:
Dec 20, 2007, 6:50 PM

Post #4 of 9 (32 views)
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Re: Air speed [In reply to Grand_Poobah] Not logged in -   Reply 
SPD?

What's that?

Seeker

"Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
> --->
>> Hi,
>>
>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>> Each time I attempt to go faster than 350 kts in a 747 I get the
>>> overspeed warning. Does that sound correct? I was under the impression
>>> they flew faster.
>>> Thanks!
>>
>> That's indicated airspeed. At high altitude, true airspeed is much higher
>> than indicated. Also, air speed != ground speed (check the ground speed
>> reading on the GPS sometime, and compare it to your air speed indicator.
>>
>> Andy
>
> Yup. As you go higher, you have to keep reducing your autothrottle SPD
> setting. Keep an eye on the GPS (as Andy says) and watch your groundspeed
> increase as you decrease your SPD value.
>
> GP




Grand_Poobah

Usenet Poster
yoohoo@yaddayadda.com
Posted on:
Dec 20, 2007, 7:02 PM

Post #5 of 9 (32 views)
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Re: Air speed [In reply to "seeker"] Not logged in -   Reply 
The button on your Autopilot that controls your auto throttle is
labeled with "SPD" (on most jets).

GP

--->
> SPD?
>
> What's that?
>
> Seeker
>
> "Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
> news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
>> --->
>>> Hi,
>>>
>>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>>> Each time I attempt to go faster than 350 kts in a 747 I get
>>>> the overspeed warning. Does that sound correct? I was under the
>>>> impression they flew faster. Thanks!
>>>
>>> That's indicated airspeed. At high altitude, true airspeed is
>>> much higher than indicated. Also, air speed != ground speed
>>> (check the ground speed reading on the GPS sometime, and compare
>>> it to your air speed indicator.
>>>
>>> Andy
>>
>> Yup. As you go higher, you have to keep reducing your autothrottle
>> SPD setting. Keep an eye on the GPS (as Andy says) and watch your
>> groundspeed increase as you decrease your SPD value.
>>
>> GP
>



"W Spilman"

Usenet Poster
kiss@myass.net
Posted on:
Dec 20, 2007, 9:13 PM

Post #6 of 9 (32 views)
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Re: Air speed [In reply to Grand_Poobah] Not logged in -   Reply 
 
"Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
> --->
>> Hi,
>>
>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>> Each time I attempt to go faster than 350 kts in a 747 I get the
>>> overspeed warning. Does that sound correct? I was under the impression
>>> they flew faster.
>>> Thanks!
>>
>> That's indicated airspeed. At high altitude, true airspeed is much higher
>> than indicated. Also, air speed != ground speed (check the ground speed
>> reading on the GPS sometime, and compare it to your air speed indicator.
>>
>> Andy
>
> Yup. As you go higher, you have to keep reducing your autothrottle SPD
> setting. Keep an eye on the GPS (as Andy says) and watch your groundspeed
> increase as you decrease your SPD value.
>
> GP

But doesn't the same thing (thinner air) that causes your IAS to
drop also allow you to fly at higher absolute (ground) speed
because there is less aerodynamic stress on the airframe?
WS




"seeker"

Usenet Poster
seeker@youwhish.com
Posted on:
Dec 21, 2007, 6:06 PM

Post #7 of 9 (32 views)
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Re: Air speed [In reply to Grand_Poobah] Not logged in -   Reply 
Ah, then it would be a contraction of Speed, maybe?

Seeker

"Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
news:OxbcPT2QIHA.5184@TK2MSFTNGP05.phx.gbl...
> The button on your Autopilot that controls your auto throttle is
> labeled with "SPD" (on most jets).
>
> GP
>
> --->
>> SPD?
>>
>> What's that?
>>
>> Seeker
>>
>> "Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
>> news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
>>> --->
>>>> Hi,
>>>>
>>>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>>>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>>>> Each time I attempt to go faster than 350 kts in a 747 I get
>>>>> the overspeed warning. Does that sound correct? I was under the
>>>>> impression they flew faster. Thanks!
>>>>
>>>> That's indicated airspeed. At high altitude, true airspeed is
>>>> much higher than indicated. Also, air speed != ground speed
>>>> (check the ground speed reading on the GPS sometime, and compare
>>>> it to your air speed indicator.
>>>>
>>>> Andy
>>>
>>> Yup. As you go higher, you have to keep reducing your autothrottle
>>> SPD setting. Keep an eye on the GPS (as Andy says) and watch your
>>> groundspeed increase as you decrease your SPD value.
>>>
>>> GP
>>




Grand_Poobah

Usenet Poster
yoohoo@yaddayadda.com
Posted on:
Dec 21, 2007, 6:38 PM

Post #8 of 9 (32 views)
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Re: Air speed [In reply to "seeker"] Not logged in -   Reply 
Yup

GP

--->
> Ah, then it would be a contraction of Speed, maybe?
>
> Seeker
>
> "Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
> news:OxbcPT2QIHA.5184@TK2MSFTNGP05.phx.gbl...
>> The button on your Autopilot that controls your auto throttle is
>> labeled with "SPD" (on most jets).
>>
>> GP
>>
>> --->
>>> SPD?
>>>
>>> What's that?
>>>
>>> Seeker
>>>
>>> "Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
>>> news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
>>>> --->
>>>>> Hi,
>>>>>
>>>>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>>>>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>>>>> Each time I attempt to go faster than 350 kts in a 747 I get
>>>>>> the overspeed warning. Does that sound correct? I was under the
>>>>>> impression they flew faster. Thanks!
>>>>>
>>>>> That's indicated airspeed. At high altitude, true airspeed is
>>>>> much higher than indicated. Also, air speed != ground speed
>>>>> (check the ground speed reading on the GPS sometime, and compare
>>>>> it to your air speed indicator.
>>>>>
>>>>> Andy
>>>>
>>>> Yup. As you go higher, you have to keep reducing your autothrottle
>>>> SPD setting. Keep an eye on the GPS (as Andy says) and watch your
>>>> groundspeed increase as you decrease your SPD value.
>>>>
>>>> GP
>>>
>



"Tont Sperling"

Usenet Poster
tony.sperling@dbmail.dk
Posted on:
Dec 21, 2007, 8:33 PM

Post #9 of 9 (32 views)
Shortcut  

Re: Air speed [In reply to "W Spilman"] Not logged in -   Reply 
I think the laws of aerodynamics determines that what you win from loss of
drag and resistance you loose in the loss of lift, so the extra speed you
get is consumed in keeping the object from falling.

Tony. . .


"W Spilman" <kiss@myass.net> wrote in message
news:476b216b$0$21789$4c368faf@roadrunner.com...
>
> "Grand_Poobah" <yoohoo@yaddayadda.com> wrote in message
> news:%23ZaKf3yQIHA.5184@TK2MSFTNGP05.phx.gbl...
>> --->
>>> Hi,
>>>
>>> In article <8D61090C-AB3A-48C0-A2FD-BEE09E669706@microsoft.com>,
>>> Marty1248<Marty1248@discussions.microsoft.com> wrote:
>>>> Each time I attempt to go faster than 350 kts in a 747 I get the
>>>> overspeed warning. Does that sound correct? I was under the impression
>>>> they flew faster.
>>>> Thanks!
>>>
>>> That's indicated airspeed. At high altitude, true airspeed is much
>>> higher
>>> than indicated. Also, air speed != ground speed (check the ground speed
>>> reading on the GPS sometime, and compare it to your air speed indicator.
>>>
>>> Andy
>>
>> Yup. As you go higher, you have to keep reducing your autothrottle SPD
>> setting. Keep an eye on the GPS (as Andy says) and watch your
>> groundspeed increase as you decrease your SPD value.
>>
>> GP
>
> But doesn't the same thing (thinner air) that causes your IAS to
> drop also allow you to fly at higher absolute (ground) speed
> because there is less aerodynamic stress on the airframe?
> WS
>




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