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#11
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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. |
#12
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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 |
#13
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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. |
#14
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"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/ |
#16
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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/ |
#17
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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/ |
#18
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#19
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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 |
#20
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