knots and kms

[adriancorrea]

This might be a stupid question but one I dont know the answer for.
Could somebody please tell me how many kms per hour are in a knot.
If the winds blowing at say 9kms per hour how many knots per hour is it blowing
thanking you in advance
Adrian

[Maxg]

I thought a knot was 2000 yards, miles is 1760 yards and a KM is 1093.3 yards so knots is 1.13 times MPH and 1.82 KPH. Which means 30kn is 34 mph or 54kph. I think. VBG Max

[adriancorrea]

Thanks Maxg
I sort of get it :D but makes things a little clearer most reports I get on the wind comes in kms
thanks again
Adrian

[Luke]

Max is right. A nautical mile is longer then a statute mile (or land mile). I've converted to metres .
A Statute/Land mile = 1608 metres approx.
A Nautical mile=1852 metres approx.

Now eg.
9 Km(your wind speed in km) = 9000 metres.
9000 metres(wind speed in metres/hour) divided by 1852 metres(1 nautical mile) = 4.85 knots

Cheers Luke

[adriancorrea]

Thanks Luke
Thats all too confusing ???
No just joking thanks alot guys.
thanks once again
Adrian

[Vern_Veitch]

A knot or nautical mile is one minute of latitude. That doesn't tell you much but I normally use a rough calculation of 2km=1nm.
Exact figures are as posted above but near enough is a good indication in most cases.
Vern

[Lucky_Phill]

Try this one http://www.onlineconversion.com/

that little site will do everything for you.

Phill ;D

[adriancorrea]

Thanks to everyone
Ive now got a better understanding of this subject.
and thanks for that web site lucky_phil
Cheer
Adrian

[lordy]

Also interesting to note that

1 knot = 2000 yards
2000 yards = 6000 feet
6000 feet per hour = 100 feet per minutre

Thus an old sailing ship could toss a rope with a knot every 100 feet out the back and feed it out over the course of 1 minute and measure how many knots it was doing! I'm not sure if that is coincidence but it works nicely enough. Think I'll stick to GPS.

[Kerry]

Also interesting to note that

1 knot = 2000 yards
2000 yards = 6000 feet
6000 feet per hour = 100 feet per minutre

Thus an old sailing ship could toss a rope with a knot every 100 feet out the back and feed it out over the course of 1 minute and measure how many knots it was doing! I'm not sure if that is coincidence but it works nicely enough. Think I'll stick to GPS.

Actually most records of a chips type log used a 28 second hour glass and the "knots" were spaced about 47-48 feet. The Bounty's log was noted as 47'3" and a 28 second glass. 48' is 8 fathoms so maybe they worked in multiples of fathoms ???

Also the international Nautical Mile is "fixed" at 1852m (1.852km) which is 6076.1157'. The geographical NM is 6080 feet

Cheers, Kerry.

[adriancorrea]

Thanks Guys
Now Im really confused ??? ??? ???
Really thanks everyone for your help
much appreciated
Cheers
Adrian

[lordy]

Actually most records of a chips type log used a 28 second hour glass and the "knots" were spaced about 47-48 feet. The Bounty's log was noted as 47'3" and a 28 second glass. 48' is 8 fathoms so maybe they worked in multiples of fathoms #???

Also the international Nautical Mile is "fixed" at 1852m (1.852km) which is 6076.1157'. The geographical NM is 6080 feet

Cheers, Kerry.



Damn, there goes my pet theory :)

[mick]

10 knots = 1 tangle
10 tangles = 1 angry fisherman
10 angry fisherman = a lot of swearing

[adriancorrea]

well done mick :)
Now Im not confused at all
LOL