just out of interest: pressure pattern navigation

[xerj]

.... when using pressure pattern nav techniques, what's a standard way for
working out groundspeed for flight planning purposes? Do you take the
forecast curved route and divide it up into segments and average it out?

TIA

[Jim Macklin]

Plane & Pilot Magazine | Feature Articles | Revisiting
Pressure ... Initiated in 1943, pressure-pattern navigation
is attributed to Dr. John Bellamy. His so-called "Bellamy
Drift" was used widely during the late 1940s, ...
www.planeandpilotmag.com/content/
pastissues/2001/mar/revisiting.html - 37k - Cached - Similar
pages


Flying Magazine - You want to put them where? The
relationship between barometric pressure and wind drift is
enshrined in the so-called Bellamy Drift, named for John
Bellamy, a civil engineer and ...
www.flyingmag.com/article.asp?section_
id=12&article_id=602&page_number=2 - 24k - Cached - Similar
pages


[PDF] AFI 11-2C-130 Volume 3, Checklist 5 File Format:
PDF/Adobe Acrobat - View as HTML
Whiz Wheel Formula for finding Bellamy Drift:. ZN. =.
DCA. Grnd Dist. 57.3. PRESSURE PATTERN ALTITUDE CHANGE.
FORMULA METHOD ...
www.e-publishing.af.mil/pubfiles/
af/11/afi11-2c-130v3cl-5/afi11-2c-130v3cl-5.pdf - Similar
pages




"xerj" > wrote in message
...
| ... when using pressure pattern nav techniques, what's a
standard way for
| working out groundspeed for flight planning purposes? Do
you take the
| forecast curved route and divide it up into segments and
average it out?
|
| TIA
|
|

[xerj]

Thanks for those Jim. I'd seen a couple of them before. The thing is that
unless I'm missing something, there isn't an explanation of WHEN you'll
arrive. There's an explanation of HOW and WHERE, but I'm wondering how you
work out time and fuel planning when using the pressure pattern method.

"Jim Macklin" > wrote in message
news:aewog.49771$ZW3.4494@dukeread04...
> Plane & Pilot Magazine | Feature Articles | Revisiting
> Pressure ... Initiated in 1943, pressure-pattern navigation
> is attributed to Dr. John Bellamy. His so-called "Bellamy
> Drift" was used widely during the late 1940s, ...
> www.planeandpilotmag.com/content/
> pastissues/2001/mar/revisiting.html - 37k - Cached - Similar
> pages
>
>
> Flying Magazine - You want to put them where? The
> relationship between barometric pressure and wind drift is
> enshrined in the so-called Bellamy Drift, named for John
> Bellamy, a civil engineer and ...
> www.flyingmag.com/article.asp?section_
> id=12&article_id=602&page_number=2 - 24k - Cached - Similar
> pages
>
>
> [PDF] AFI 11-2C-130 Volume 3, Checklist 5 File Format:
> PDF/Adobe Acrobat - View as HTML
> Whiz Wheel Formula for finding Bellamy Drift:. ZN. =.
> DCA. Grnd Dist. 57.3. PRESSURE PATTERN ALTITUDE CHANGE.
> FORMULA METHOD ...
> www.e-publishing.af.mil/pubfiles/
> af/11/afi11-2c-130v3cl-5/afi11-2c-130v3cl-5.pdf - Similar
> pages
>
>
>
>
> "xerj" > wrote in message
> ...
> | ... when using pressure pattern nav techniques, what's a
> standard way for
> | working out groundspeed for flight planning purposes? Do
> you take the
> | forecast curved route and divide it up into segments and
> average it out?
> |
> | TIA
> |
> |
>
>

[Jim Macklin]

Since I have only read about it and have not really had an
opportunity to check it out, consider the Bellamy drift is
based on the average crosswind, I do believe you can also
derive the average tail/headwind and apply that to the
expected trip distance.

The USAF Navigtation manual has a section on these
techniques.

If you look at the
www.e-publishing.af.mil/pubfiles/af/11/afi11-2c-130v3cl-5/afi11-2c-130v3cl-5.pdf
you will see steps for rules of thumb.


Note the original links below are broken and are repaired.

www.planeandpilotmag.com/content/pastissues/2001/mar/revisiting.html

www.flyingmag.com/article.asp?sectionid=12&article_id=602&page_number=2


"xerj" > wrote in message
...
| Thanks for those Jim. I'd seen a couple of them before.
The thing is that
| unless I'm missing something, there isn't an explanation
of WHEN you'll
| arrive. There's an explanation of HOW and WHERE, but I'm
wondering how you
| work out time and fuel planning when using the pressure
pattern method.
|
| "Jim Macklin" > wrote
in message
| news:aewog.49771$ZW3.4494@dukeread04...
| > Plane & Pilot Magazine | Feature Articles | Revisiting
| > Pressure ... Initiated in 1943, pressure-pattern
navigation
| > is attributed to Dr. John Bellamy. His so-called
"Bellamy
| > Drift" was used widely during the late 1940s, ...
| > www.planeandpilotmag.com/content/
| > pastissues/2001/mar/revisiting.html - 37k - Cached -
Similar
| > pages
| >
| >
| > Flying Magazine - You want to put them where? The
| > relationship between barometric pressure and wind drift
is
| > enshrined in the so-called Bellamy Drift, named for John
| > Bellamy, a civil engineer and ...
| > www.flyingmag.com/article.asp?section_
| > id=12&article_id=602&page_number=2 - 24k - Cached -
Similar
| > pages
| >
| >
| > [PDF] AFI 11-2C-130 Volume 3, Checklist 5 File Format:
| > PDF/Adobe Acrobat - View as HTML
| > Whiz Wheel Formula for finding Bellamy Drift:. ZN.
=.
| > DCA. Grnd Dist. 57.3. PRESSURE PATTERN ALTITUDE CHANGE.
| > FORMULA METHOD ...
| > www.e-publishing.af.mil/pubfiles/
| > af/11/afi11-2c-130v3cl-5/afi11-2c-130v3cl-5.pdf -
Similar
| > pages
| >
| >
| >
| >
| > "xerj" > wrote in message
| > ...
| > | ... when using pressure pattern nav techniques, what's
a
| > standard way for
| > | working out groundspeed for flight planning purposes?
Do
| > you take the
| > | forecast curved route and divide it up into segments
and
| > average it out?
| > |
| > | TIA
| > |
| > |
| >
| >
|
|