What speed is your actual speed?

[100Coogn]

<S> To OP.  You have asked an honest and apparently difficult question for some.

Only took three pages so far to try to answer your question...
I look forward to pages to come, so I may learn as well.

Coogan

[FLS]

I will try this, Earl, hopefully within the next few days.  Will post results here.

- oldman (although I am not eager to take off with a 15 knot tailwind)

You needn't risk taking off with a tailwind. Nobody disputes the advantage of taking off into the wind.
The claim was that your feet per minute climb rate varies with wind direction but Earl often argues a different point then the one being discussed, even if he brought it up.

[earl1937]

I will try this, Earl, hopefully within the next few days.  Will post results here.

- oldman (although I am not eager to take off with a 15 knot tailwind)

I had rather you not try that! Many people are missing the point I am making, but we are having a good discussion about the effects of wind on climbing. The whole discussion is about getting to 10,000 feet the quickest! I will post the CORRECT answer to this discussion in time, but first, lets see what other "pilots" in here have to say about this subject.
Don't want anything to happen to you, sir, as you are one of the knowledgeable people who make good posts in this forum. 

[earl1937]

It's "Pitot", not "Pidot" after the French engineer Henri Pitot who invented it. His name is pronounced "pee-toe".

You won't climb faster in ft/min in a headwind. Your climb will be steeper relative to the ground, but not relative to the airflow around your aircraft. Time to altitude will be the same no matter which way the wind blows. From a standstill on the runway taking off into the wind will result in a shorter time to altitude, but that's only because of the shorter ground roll; in essence you're starting with an airspeed equal to the wind speed, while with a tail wind you have to catch up to the wind first. Once you're airborne there is no difference because the ground then becomes irrelevant (unless you hit it!).

Si, 18 hour days on this ole body is getting me. You are right, it is PITOT, can't believe I typed what I did! You are getting real close to the correct reply to my statement which a lot of people are taking exception with. BTW, I know you are in Norway, but are you of German decent?

[earl1937]

You needn't risk taking off with a tailwind. Nobody disputes the advantage of taking off into the wind.
The claim was that your feet per minute climb rate varies with wind direction but Earl often argues a different point then the one being discussed, even if he brought it up.

Being in the trainer corp, you should know that different points of view about aviation related subjects, usually ends up educating people on the subject at hand, no matter what the original statement made was.
A good instructor is one who can draw a verbal description of subject at hand and the student can mentally draw a picture of what you said. Any student will learn faster if he or she sees the whole picture of matter being discussed. I am not an aviation engineer by any stretch, I just try to convey real life situations which I have experienced my self. I did not claim that climb rate varies with wind direction, Time to climb does vary with wind direction.

[asterix]

Another effect of wind, which a lot of people do not notice is this: your aircraft will climb faster in feet per minute into the wind than it will climbing down wind.

This was the statement and it does not mention any takeoff or time to 10000ft, only feet per minute also known as ROC. I am with doright on this one.

[FLS]

Being in the trainer corp, you should know that different points of view about aviation related subjects, usually ends up educating people on the subject at hand, no matter what the original statement made was.
A good instructor is one who can draw a verbal description of subject at hand and the student can mentally draw a picture of what you said. Any student will learn faster if he or she sees the whole picture of matter being discussed. I am not an aviation engineer by any stretch, I just try to convey real life situations which I have experienced my self. I did not claim that climb rate varies with wind direction, Time to climb does vary with wind direction.

Actually you did make that claim which is why I asked if that's what you meant to say.   

[Golfer]

I want to go on record I'm not okay with people taking off in light airplanes with 15 knot tailwinds for the sake of an Internet board discussion.

And define "time to climb"

If you're talking about brake release to 10,000 headwind vs tailwind it's different than being level at 5 climbing to 15.

Your example was that a 1000ft/min climb will result in two different times to climb to a predetermined altitude based on wind direction. I disagree.

[kvuo75]

Sorry Charlie, you get your indicated airspeed from the PIDOT tube, coupled with a static port! explanation by the Federal Aviation Agency:
 
Along with the altimeter and vertical speed indicator, the airspeed indicator is a member of the pitot-static system of aviation instruments, so named because they operate by measuring pressure in the pitot and static circuits.

Airspeed indicators work by measuring the difference between static pressure, captured through one or more static ports; and stagnation pressure due to "ram air", captured through a pitot tube. his difference in pressure due to ram air is called impact pressure.

that's what I said all along..   

you're the one who said the pitot tube measured velocity.

[kvuo75]

 I did not claim that climb rate varies with wind direction, Time to climb does vary with wind direction.

that is self contradictory.



btw.

how does an airplane know which direction the wind is coming from.. say.. above a cloud deck with no nav instrumentation at all.

magic?

[Oldman731]

I want to go on record I'm not okay with people taking off in light airplanes with 15 knot tailwinds for the sake of an Internet board discussion.

Yes.  In the light of day the notion does not appear as sensible as it did at the time.

Further proof of the wisdom of the bottle-to-throttle regulation.

- oldman (plus I'd need a really long runway)

[doright]

The whole discussion is about getting to 10,000 feet the quickest!

I think I see the problem. Define quickest.

If you mean look at the clock and measure time and multiply it be the rate of climb then it will exactly equal the altitude gained (assuming you start the clock after liftoff) no matter the wind direction.

If by quickest you mean look out the window and see how far the point below you is from your t/o position when you reach 10000' then wind definitely has a role. The ground distance traveled while climbing into a head wind is a lot less then the ground distance traveled while climbing with a tail wind. But at the same time the time to altitude will be the identical.

[FLOOB]

Always remember in the main arena settings the time speed multiplier is set to 2.0. So you're actually only going half as fast as your indicators indicate.

[Lusche]

Always remember in the main arena settings the time speed multiplier is set to 2.0. So you're actually only going half as fast as your indicators indicate.

 

[Bear76]

 

No kidding