Does a jet aircraft need to constantly adjust nose down to follow the curvature of the earth?Comments for Does a jet aircraft need to constantly adjust nose down to follow the curvature of the earth? at http://askcaptainlim.com , comment 1 to 26 out of 20 comments
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Everything is relative.
What do you have as a point of reference when on a plane?
How would you possibly be able to perceive such a gradual descent? And you aren't even descending relative the ground.
It's not as if you have a perfectly straight line drawn in the sky outside the plane window to judge your exact flight path.
The altitude is judged by the planes distance from the ground, so as the earth drops away enough thrust is applied to maintain a set distance from the ground until you want to get closer to the ground to land at which point the thrust is decreased.
- DanSat, 19 Mar 2016 07:33:02 +0100Contrails are not horizontal
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Some of you people responding have a shoddy grasp at science. The same reason your eyes see a flat earth in the distance is why you see contrails as being horizontal.....they are very slightly curved, too imperceptible for the eye to discern - RFWThu, 10 Mar 2016 19:09:34 +0100Ship Captain ?????
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Does a gyroscope on a normal global commercial flight adjust it's attitude to the curving suface of the Earth (Gravity) while underway or does it remain in the same (horizontal) attitude as takeoff and then have to be readjusted upon landing
Highseascaptain@yahoo.com - Anthony BSun, 28 Feb 2016 12:57:59 +0100Two words
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Newtonian gravity - a cannon fired will not continue in a linear direction due to the constant pull of the Earth's gravity. To break from the Earth's gravity, an aeroplane must achieve higher speed, which is not possible if the aircraft is on autopilot. - DanielSun, 21 Feb 2016 11:20:13 +0100...
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if the plane is adjusting its height to the curvature of the planet why are persistent contrails always perfectly horizontal? - pruttFri, 12 Feb 2016 13:18:51 +0100Level Flight
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Or you're just as gullible and uneducated as the rest of this trend-following-flat-earth community. You people are absolutely hilarious and are making fools of yourselves. - chrisMon, 01 Feb 2016 19:20:01 +0100Curvature
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Seeing as we're on this topic, I will try and help with the basic arithmetic part. I realize it's been a while since anyone's responded to this thread, but I figured I'd give something for people who keep trying to 'prove' (poorly) that the earth is flat
When it comes to the curvature, if the estimates that you have to account for approximately 8 inches for every mile...
Traveling at 500mph, that's approximately 8.3 miles per minute. Which means that at a curvature of 8 inches per mile equates to a change of 66.7 inches every minute. VERY different than the claim that you'd have to move 2777 feet to account for curvature every minute. - JesseWed, 20 Jan 2016 22:03:12 +0100curvature is right.
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Curvature equation under 1,000 miles is: miles squared times 8 divided by 12 for answers in feet.
For a distance of three miles the curve results in a ~6 foot drop. 3X3X8/12=6 feet. Did you follow lakawak? A linear drop in 8 inches per mile is the slope angle not a curve. A curve is inversely proportional to the distance. - JohnsonTue, 19 Jan 2016 12:24:43 +0100Math, how does it work?
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Say the plane is traveling @ 600mph. That means they are traveling 10 miles per minute. With a curvature of 2' per 3 miles, the plane would need to descend a little over 6' per minute to maintain altitude. I doubt passengers are going to feel that. - DunnoSat, 16 Jan 2016 13:11:56 +0100...
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500 miles an hour divided by 60 mins per hour=8.33 miles a min multiped by 8 inches a mile =66.67 inches a min = 5 and half feet per minutes downward descent needed - ProfessorMon, 11 Jan 2016 23:42:02 +0100Correct Curvature
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The curvature is not 8 inches times the distance since you cannot form a sphere that way. Only the first mile is 8 inches then it grows exponentially. The correct math is 8 inches times the distance squared. So three miles would be 3 x 3 x 8 = 72 inches. At 500 miles the earth will fall away 166,495 feet. If the plane is traveling 500 mph, the earth is falling away at a rate of 2,775 feet per minute. If autopilot is off, the pilot must reduce altitude by 2,775 feet per minute or 46 feet per second to maintain 35,000 feet. Isn't that much greater then descent rates when landing?
Thanks for your time and consideration. - CSMon, 28 Dec 2015 11:39:39 +0100well
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NASA and modern astronomers claim we are living on an oblate spheroid 25,000 statute miles in equatorial circumference with a curvature of 7.935 inches to the mile, varying inversely as the square of the distance, meaning in 3 miles there is a declination of nearly 6 feet, in 30 miles 600 feet, in 300 miles 60,000 feet and so on. Dont take my word for it go check yourself.
The truth is no pilot will admit to what he sees with his own eyes that the earth is actually flat for fear of being sacked instantaneously as many whistle blowers will testify too. As well as the equally ridiculous intercontinental flight paths that take some very questionable routes across a so called globe.
Go ahead laugh you will be proved wrong and you will remember this. Go find out for yourself.
You have been lied to and will find it very difficult to accept, that's if my post actually is approved and kept up here.
N. - NeilTue, 08 Dec 2015 10:02:21 +0100Curvature calculation
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Curvature is approximately 8" per [i]squared [/i] mile so in 3 miles it will drop 6 ft. - Joe BLowTue, 01 Dec 2015 16:50:01 +0100Mr
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Okay, Similar question.... How does an airplane's Gyroscopic Artificial Horizon account for the Earth's curvature? As I understand it - a gyroscope keeps absolute position and the aircraft rotates around it, allowing the instrument to show the plane's attitude on the artificial horizon... But, logic would dictate that if I flew around the world, the artificial horizon should show me upside down half the time... What does it do to account for this, and prevent erroneous readings?
Steve In Indiana - SteveTue, 01 Dec 2015 02:42:20 +0100Mr.
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Okay, Similar question.... How does an airplane's Gyroscopic Artificial Horizon account for the Earth's curvature? As I understand it - a gyroscope keeps absolute position and the aircraft rotates around it, allowing the instrument to show the plane's attitude on the artificial horizon... But, logic would dictate that if I flew around the world, the artificial horizon should show me upside down half the time... What does it do to account for this, and prevent erroneous readings?
Steve In Indiana - SteveTue, 01 Dec 2015 02:33:10 +0100LEVEL FLIGHT
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An aircraft flies at a constant pressure altitude and thus maintains the same relative distance from sea level at all times. If it were to climb as it flew along it would be registering a decreasing pressure which it does not. - JoeFri, 27 Nov 2015 15:32:29 +0100re: curvature is wrong
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no its not. its 8 inches per mile squared. if it was just 8" per mile it would be a long downward plain. the formula for the curve for 1 miles is 1x1x8=8 inches. for 2 miles its 2x2x8=32 inches, for 3 miles it is 3x3x8=72 inches. it gets real big real fast. for 10 miles it would be 10x10x8=800 inches or 66.66 ft.
flying from seattle, wa to new york city is 2857.6 miles by air. that is 1031 miles of curvature the plane would have to encounter in a 6 hour flight. that means the plane would have to descend i have talked to several arline pilots. they said once the plane gets to crusing altitude they make no corrections, as if they were flying on a flat plain. they do not make constant downward corrections in altitude at least not of that severity - ben richardsonTue, 24 Nov 2015 17:15:59 +0100follow up
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any word from the captain? - jakeWed, 18 Nov 2015 16:10:51 +0100curvature is wrong
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Not sure where the question askers got his numbers, but the curvature is about 8 inches per miles. So that is TWO feet per 3 miles. Not 6. - lakawakTue, 10 Nov 2015 07:00:41 +0100Level Flight
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Or the alternative, the earth is flat. - M1k3Sat, 19 Sep 2015 23:45:56 +0100