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Converting From Mi/Km Into Kts?  
User currently offlineAC320 From , joined Dec 1969, posts, RR:
Posted (13 years 6 months 4 days 3 hours ago) and read 955 times:

I was looking at the Boeing and Airbus sites where they give all the speeds for their aircraft in either miles or Kilometres per hour, so how do I convert both into nautical miles per hour (kts)?

6 replies: All unread, jump to last
 
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 6 months 4 days 3 hours ago) and read 930 times:

According to my workstation, one (statute) MPH equals=

.8689909 knots

1.609258 kilometer/hr


User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 2, posted (13 years 6 months 4 days 2 hours ago) and read 926 times:

OPNLguy is right,

NM=SM / 1.152

NM=KM / 1.855



"Never trust a clean Crew Chief"
User currently offlineAC320 From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 6 months 4 days 1 hour ago) and read 915 times:

Thanks guys.

I've been working on the schedules for a VA and this will really help get my job done faster!


User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 4, posted (13 years 6 months 4 days ago) and read 909 times:

>>>I've been working on the schedules for a VA and this will really help get my job done faster!

Pardon me if you already knew/considered this, but if you're using speeds from the manufacturer's websites, keep in mind that they are generalized, and essentially a zero-wind speed. For accurate schedule planning, you'll need to consider a certain amount of head/tail wind, as it will affect the enroute time, especially on longer flight segments.

As a general example, take a 737-700 on a 1,500nm flight. The aircraft's true airspeed (TAS) at FL350 is about 450 knots, but that's zero-wind. Traveling westbound into an assumed 100-knot headwind, the aircraft still has a 450 TAS, but is now at a GROUNDspeed (GS) of 350 knots. Conversely, an easbound flight with an assumed 100-knot tailwind would produce a 550-knot groundspeed. (I say again, this is a generalized example, and doesn't consider the climb/descent).

1000nm distance divided by 350-knot GS = 2:51
1000nm distance divided by 450-knot GS = 2:13 1000nm distance divided by 550-knot GS = 1:49

One certainly can't consider *every* wind variable when planning schedules, but it'd prudent to consider at least *some*, or your VA could find itself behind schedule...

Cheers...


User currently offlineAC320 From , joined Dec 1969, posts, RR:
Reply 5, posted (13 years 6 months 3 days 17 hours ago) and read 884 times:

Way ahead of you, we already stick in some extra time to the scheduled time to account for ATC, ground delays, accidents, and weather. But thanks for the tip anyway..  Smile

User currently offlineTimz From United States of America, joined Sep 1999, 6836 posts, RR: 7
Reply 6, posted (13 years 6 months 2 days 23 hours ago) and read 872 times:

statute mile = 1.609344 km exactly

(in other words, 63360 inches per mile, and the inch is defined as 0.0254 meters exactly)

nautical mile = 1852 meters exactly

Since the earth isn't spherical the definition of a nautical mile isn't obvious, and there have been various ones in the past; the 1852-meter definition is presumably semi-arbitrary.


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