Feet Per Minute Conversion Question

How do you convert Kts per Sec / Meters per sec / Kilometers etc... to
Feet per minute

Look at a Winter brand vario. Full scale = 1,000fpm, 10 kt, or 5 m/s, as
the customer prefers. Only the face-plate is changed, it's the same unit
otherwise.

Navigational question for the day;
One minute of latitude = 1 nautical mile. At what point on the earth does 1
minute of longatude = 1 nautical mile?
JJ Sinclair

On the Equator.

W.J. (Bill) Dean (U.K.).
Remove "ic" to reply.


"JJ Sinclair" wrote in message
...

Navigational question for the day;
One minute of latitude = 1 nautical mile.
At what point on the earth does 1 minute of longitude = 1 nautical mile?

JJ Sinclair.

"Pete S" wrote in message ...
Looks like they made the mistake of assuming that a nautical mile was 6000
feet when it's actually 6080 ft

No, it's actually 1852 m in today's world. Your 6080 ft is 1853.184
m, all around the world since an international agreement on the
definition of the yard (and thus feet, inches, etc.) over 40 years
ago.

Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/

(JJ Sinclair) wrote in message ...
feet per sec X 0.508 = meters per sec

This from the 1987 SSA MEMBERSHIP HANDBOOK.

Haven't seen an updated book in 20 years. It has lots of useful information,
like this in it.
JJ Sinclair

Right number, for something. Unfortunately, not for the units you
have stated.

This illustrates quite well one of the many pitfalls of having to make
conversions. Get with it, get rid of the Fred Flintstone units and
use the interdisciplinary and International System of Units.

It is actually hectofeet per minute (a screwball unit) that you'd
multiply by 0.508 to get meters per second:

100 ft/min = 0.508 m/s

Note that 100 ft/min is not 1 ft/s, the units you claimed, since we
don't have 100 seconds in a minute.

--
Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/
"It's not the things you don't know
what gets you into trouble.

"It's the things you do know
that just ain't so."
Will Rogers

On Sun, 24 Aug 2003 14:38:07 +0100, "W.J. \(Bill\) Dean \(U.K.\)."
wrote:

On the Equator.

Wrong.

There have been some geographical miles based on the equatorial
circumference, but I've never seen them called nautical miles. There
was one geographical mile equal to 4 minutes of arc on the equator, or
about 7.421 km; I have a copy of a map using these units.

Nautical miles have normally been defined to be some midrange,
midlatitude value for a minute of arc as you travel north-south along
a meridian.

At the equator, 1 minute of longitude is 1.001795 nmi.

But 1 minute of latitude (geodetic latitude, the kind normally used)
at the Equator is only about 0.9950 nmi.

W.J. (Bill) Dean (U.K.).
Remove "ic" to reply.


"JJ Sinclair" wrote in message
...

Navigational question for the day;
One minute of latitude = 1 nautical mile.
At what point on the earth does 1 minute of longitude = 1 nautical mile?

JJ Sinclair.

It is at some place close to the equator, where the circumference of
the earth at that latitude is 40.0032 Mm, rather than the 40.007495 Mm
at the Equator (WGS-84 ellipsoid). A latitude close to the arccosine
of 40.0032/40.007495, or about 3½ degrees from the Equator either
north or south (a more exact value depends on which type of latitude
you use, as well as which ellipsoid you use to approximate this).

To help see this better, your "minute of longitude" at a latitude of
60 degrees would be about 0.50 nmi, and at the poles a
"minute of longitude" is 0 nmi. It is actually the minute of latitude
as you travel along a meridian (constant longitude) that most people
consider in evaluating the fit of a nautical mile to the Earth.

Now, at what point is one centigrade of latitude equal to one
kilometer?

Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/

On Sun, 24 Aug 2003 02:28:58 GMT, Ralph Jones
wrote:

On 23 Aug 2003 12:54:18 -0700, (Steve B)
wrote:

I think in Feet Per Minute... I must be from a different country.

How do you convert Kts per Sec / Meters per sec / Kilometers etc... to
Feet per minute

1 nautical mile = 6076.115 feet.

Actually, 1 nmi is defined as 1852 m, your feet figure is a conversion
accurate to that many places.

1 knot = 1 nautical mile per hour = 1.1508 mph = 101.3 feet per
minute.
1 meter = 39.37 inches.

That was the U.S. definition from 1893 until 1959. Today, we have
units defined exactly as 1 yd = 0.9144 m or 1 ft = 0.3048 m or 1 in =
0.0254 m.

1 kilometer = 1000 meters = 0.621 miles = 3281 feet.
1 meter per second = 3.281 feet per second = 197 feet per minute.

For practical purposes, 1 knot = 100 feet per minute is close enough
for glide computations. Also, one minute of latitude covers one
nautical mile on the ground, so the vertical lines on a chart make an
excellent nautical mile scale.

Sure, but also 1 mm on those charts equals 1 km (regional charts) or 2
km (sectional charts). So, since you are using charts drawn to a
metric scale, an ordinary ruler in millimeters also makes an excellent
kilometer scale. Don't need one of those fancy, expensive plotters if
you use sensible units that fit the scale of the charts.


Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/

(Steve B) wrote in message . com...

How do you convert Kts per Sec / Meters per sec / Kilometers etc... to
Feet per minute

Knots per second would be a unit of acceleration, since knots are
already a unit of velocity. One knot is one nautical mile per hour.

I have two "older" gliders, each with 2 varios (4 varios total). 1
vario reads in feet per second, another in meters per second, another
in knots, and the last one in 100's of feet per second...

I have settled on thinking in terms of "knots" because 1) that's what
everyone else uses where I fly (so I can easily decipher thermal
strength callouts on the radio and so forth) and 2) for all practical
purposes 100 fpm is one knot, as others have correctly pointed out.

-Doug

Iwrote:
I have two "older" gliders, each with 2 varios (4 varios total). 1
vario reads in feet per second, another in meters per second, another
in knots, and the last one in 100's of feet per second...

Pardon me, that should read "100's of feet per *minute*..."

-Doug

(JJ Sinclair) wrote in message ...
feet per sec X 0.508 = meters per sec

This from the 1987 SSA MEMBERSHIP HANDBOOK.

Haven't seen an updated book in 20 years. It has lots of useful information,
like this in it.
JJ Sinclair

1 meter =39.37 inches. Methinks someone screwed up, like JJ. Maybe
try .3048, just seems to agree with fact, and good math, not new math,
not french math, either. Nautical mile 6080 feet, as against 5280 for
statute mile.

nautical mile - statute mile =1.1515

statute mile - nautical mile = .8684