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Bombardier Dash 8 Q400 speed question

 
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Iain Smith

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Since: May 29, 2007
Posts: 481



(Msg. 1) Posted: Tue Aug 07, 2007 9:56 pm
Post subject: Bombardier Dash 8 Q400 speed question
Archived from groups: alt>games>microsoft>flight-sim (more info?)

There is an article in Airliner World magazine about Porter Airlines, which
started operating Dash 8 - Q400s out of Toronto City Centre Airport about 8
months ago. In the article the author says "the aircraft is capable of
flying at 400 mph at up to 25000 feet." He does not say whether this is
airspeed or ground speed.

Now I have the PSS Dash 8 -Q300 which cannot excced 230 kts IAS without
overspeeding. Am I right, therefore, in thinking that the 400 mph must be
ground speed with a very strong following wind?

Iain

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Not4wood

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Since: Feb 18, 2006
Posts: 658



(Msg. 2) Posted: Tue Aug 07, 2007 10:56 pm
Post subject: Re: Bombardier Dash 8 Q400 speed question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

You have to understand that the usual person who doesnt understand aviation
knows nothing between IAS or ground speed. They only look at the faster
speed which is on the ground, so its ground speed. AND, dont even try to
explain tail wind to them. There eyes will roll LOL.

Not4wood


"Iain Smith" <iainsmithdotrugbyatbtinternetdotcom> wrote in message

> There is an article in Airliner World magazine about Porter Airlines,
> which started operating Dash 8 - Q400s out of Toronto City Centre Airport
> about 8 months ago. In the article the author says "the aircraft is
> capable of flying at 400 mph at up to 25000 feet." He does not say whether
> this is airspeed or ground speed.
>
> Now I have the PSS Dash 8 -Q300 which cannot excced 230 kts IAS without
> overspeeding. Am I right, therefore, in thinking that the 400 mph must be
> ground speed with a very strong following wind?
>
> Iain
>

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Jay Beckman

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Since: Jul 31, 2007
Posts: 19



(Msg. 3) Posted: Tue Aug 07, 2007 10:56 pm
Post subject: Re: Bombardier Dash 8 Q400 speed question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On Aug 7, 2:32 pm, "Not4wood" wrote:
> You have to understand that the usual person who doesnt understand aviation
> knows nothing between IAS or ground speed. They only look at the faster
> speed which is on the ground, so its ground speed. AND, dont even try to
> explain tail wind to them. There eyes will roll LOL.
>
> Not4wood


Not to mention the difference between IAS and TAS...

Jay Beckman
PP-ASEL
Chandler, AZ
www.pbase.com/flyingphotog
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enigma

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Since: Jan 18, 2007
Posts: 110



(Msg. 4) Posted: Tue Aug 07, 2007 11:38 pm
Post subject: Re: Bombardier Dash 8 Q400 speed question [Login to view extended thread Info.]
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Kinda like explaining the difference between a pioneering pilot
and a modern pilot. Only one claim to be the real thing.

http://www.pbs.org/wgbh/nova/santos/pod-anti.html

http://www.pbs.org/wgbh/nova/santos/

Surprised)

Wood, clothe and wire. :O

"Not4wood" wrote in message

> You have to understand that the usual person who doesnt understand
> aviation knows nothing between IAS or ground speed. They only look at the
> faster speed which is on the ground, so its ground speed. AND, dont even
> try to explain tail wind to them. There eyes will roll LOL.
>
> Not4wood
>
>
> "Iain Smith" <iainsmithdotrugbyatbtinternetdotcom> wrote in message
>
>> There is an article in Airliner World magazine about Porter Airlines,
>> which started operating Dash 8 - Q400s out of Toronto City Centre Airport
>> about 8 months ago. In the article the author says "the aircraft is
>> capable of flying at 400 mph at up to 25000 feet." He does not say
>> whether this is airspeed or ground speed.
>>
>> Now I have the PSS Dash 8 -Q300 which cannot excced 230 kts IAS without
>> overspeeding. Am I right, therefore, in thinking that the 400 mph must be
>> ground speed with a very strong following wind?
>>
>> Iain
>>
>
>
>



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Pierre

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Since: Oct 08, 2006
Posts: 53



(Msg. 5) Posted: Sat Aug 11, 2007 1:14 am
Post subject: Re: Bombardier Dash 8 Q400 speed question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Le Tue, 7 Aug 2007 21:13:25 +0100, "Iain Smith"
<iainsmithdotrugbyatbtinternetdotcom> a écrit :

>There is an article in Airliner World magazine about Porter Airlines, which
>started operating Dash 8 - Q400s out of Toronto City Centre Airport about 8
>months ago. In the article the author says "the aircraft is capable of
>flying at 400 mph at up to 25000 feet." He does not say whether this is
>airspeed or ground speed.
>
>Now I have the PSS Dash 8 -Q300 which cannot excced 230 kts IAS without
>overspeeding. Am I right, therefore, in thinking that the 400 mph must be
>ground speed with a very strong following wind?
>
>Iain
>
It's not necessary to have any tailwind to calculate this :

230 kts IAS = 264 mph (1 kts = 1 nm/h and 1 nautical mile = 1.151
statute mile ) and at 25000 feet MSL, the converter

http://www.csgnetwork.com/tasinfocalc.html

gives 264 mph IAS -> 396 mph TAS

Not so far from 400 mph TAS (true air speed)

Without any wind, it's also 400 mph groundspeed.

Hope this helps Smile

Another Pierre LFBE
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Iain Smith

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Since: May 29, 2007
Posts: 481



(Msg. 6) Posted: Sun Aug 12, 2007 3:57 pm
Post subject: Re: Bombardier Dash 8 Q400 speed question [Login to view extended thread Info.]
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"Pierre" wrote in message

> gives 264 mph IAS -> 396 mph TAS
>
> Not so far from 400 mph TAS (true air speed)
>
> Without any wind, it's also 400 mph groundspeed.
>
> Hope this helps Smile

Thanks Pierre, that is helpful.

Iain
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