1. Junior Member
Join Date
Mar 2005
Posts
30

wind speed in knots

Can anybody help,

If I have a crosswind of 10knots, what it that in mph. How do I calculate my heading for a flight of 100 miles with this crosswind.
The wind is in knots, and the flight distance is in n/miles?

Is there an easy conversion.

Any help welcome.
thanks

2. Top Gun
Join Date
Mar 2005
Location
Michigan
Posts
6,175

RE: wind speed in knots

1 knot = 1.15 mph (i.e. 10 knots equals 11.5 mph)

3. Senior Member
Join Date
Mar 2005
Location
North Port, Fla, USA
Posts
1,645

RE: wind speed in knots

Good question, "The Winds".It is the essence of air navigation.Long ago the answers to these ques. were the subject of the "E-6B" flight computer. Still valid today. I think the formula still is,
T.C, WCA,TH,VAR,MH,DEV =CH, much easier to visualize the wind effect on the wind side of the E-6B.A great tool,many aviation uses. This may help you. VIN;)

4. Senior Member
Join Date
Mar 2005
Location
Kennebunkport, ME
Posts
1,111

RE: wind speed in knots

You'll want to get a wind correction computer. This is not a "computer" in the sense of an electronic device that runs algorythms, but rather a computer in the sense that it allows you to compute wind correction angles. These are often found on the back of E-6B flight computers. Here's a link to an online flight computer that will allow you to calculate wind correction angles: http://www.csgnetwork.com/e6bcalc.html
Also, you will probably want to consider picking up a real one for use in the cockpit. I recommend Sporty's E6B, available here: www.sportys.com

Good luck!

5. Senior Member
Join Date
Mar 2005
Location
Shalimar, FL, USA.
Posts
1,342

RE: wind speed in knots

For the most part though, talking in light wind terms (like 10 knots for example), just remember that 1 statute mile per hour, and 1 nautical mile per hour are just about the same. I.E., you're flying at 120mph, with a 15 knot headwind, then you will only be doing about 105 knots. It's acutally more like 103.3759846 knots or something...

But yea, the conversion itself is a solid number. I've heard 1 knot, is 1.1616 mph... whatever, pretty close.

Kyle

EDIT: I suk at spelling

6. Top Gun
Join Date
Mar 2005
Location
Michigan
Posts
6,175

RE: wind speed in knots

>For the most part though, talking in light wind terms (like
>10 knots for example), just remember that 1 statute mile per
>hour, and 1 nautical mile per hour are just about the same.
>I.E., you're flying at 120mph, with a 15 knot headwind, then
>you will only be doing about 105 knots. It's acutally more
>like 103.3759846 knots or something...
>
>But yea, the conversion itself is a solid number. I've
>heard 1 knot, is 1.1616 mph... whatever, pretty close.

Kyle, even as an approximation, that doesn't really work. 120mph is about 105 kts without even factoring the heading. Now, if we do factor in the 15 kt headwind, you're doing about 90 kts.

7. Senior Member
Join Date
Mar 2005
Location
Shalimar, FL, USA.
Posts
1,342

RE: wind speed in knots

Yea... got my knots and mph there backwards. But still, you don't have to bust out a calculator everytime... just figure it in mph if it's light, and you're fine. I.E., if you see 45knots of wind at any time, then that is alot! There's no chance the wind will be only 11mph, when calculated :-lol

Kyle

8. Senior Member
Join Date
Mar 2005
Location
North Port, Fla, USA
Posts
1,645

RE: wind speed in knots

Hi, Your cavalier attitude reminds me when I was younger. On a sim, well its OK. Then theres "BUT"! This old saying may really help you,
"Aviation in itself is not inherently dangerous.
But to an even greater degree than the sea, it is
terribly unforgiving of any carelessness, incapacity
or neglect." To which I learned,If your gonna do it, do it right. Cheers to ya Kyle, ;) VIN

9. VIP Member
Join Date
Mar 2005
Location
New York.
Posts
4,439

RE: wind speed in knots

To get an accurate figure you need a few more things. First is the course you need to fly. Second is the wind direction. Next is the speed of your aircraft. The longer you are subjected to a crosswind the greater the drift. Third if you are using an E6-B you will also need the magetic variation.

Over a hundred miles the amount of drift if you figured wrong could put you so far away from an airport you might not see it. This is where checkpoints come into play. Luckly in FS the winds aloft when they are shown to be 45knots at 340 will always be that. In a real life situation the winds aloft are a forcast and very suject to change. Hence, you want to make sure that you are not over-correcting or under-correcting

10. Senior Member
Join Date
Mar 2005
Location
Shalimar, FL, USA.
Posts
1,342

RE: wind speed in knots

Yea, I am young. On a sim, it's fine, and so far in real life (several hundred hours now), it's done me well too. I've landed before in my experimental ultralight (most of my flighttime) in an 18 knot crosswind, or 20.90 mph ;-) I just get a kick out of it, when people talk about how dangerous flying is, and how it takes a person of iron bravery, incredible hand/eye coordination, and precision, with no lapse in judgement to fly. I find it much easier to fly, than drive. Tune the radio in a car out on Highway 123, and you clip another passing car at a combined speed of 120mph, now talk about attention requiring.

I can see how an IFR pilot needs to be super an@l about numbers and whatnot. I've flown with people before in IFR, and I don't like it. I just look up at the sky for weather reports... :D

Kyle

EDIT: I still suk at spelling

Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•