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originally posted by: dragonridr
Your wrong look up how a plane determines altitude. A plane uses air pressure to determine how high the aircraft is flying. Meaning that in order to show zero in climb or decent it has to fly along a path with the same air density.
originally posted by: dragonridr
So again explain how this instrument proves anything according to your theory. If the only determination of altitude is based off air density how would this differ following a curve or maintaining a straight course? One other thing could you explain why air gets thinner the higher we go? With gravity this makes sense but without it I'm curious what you think is happening
originally posted by: Soylent Green Is People
originally posted by: OneBigMonkeyToo
A VSI tells you about changes in air pressure as you rise and fall. That air pressure is based on the point you are in now, not some distant point along the Earth's curve.
www.boldmethod.com...
Yes, and if you read the comments, you can see that some people talk about pilots sometimes "chasing" a particular VSI model that features an accelerometer because they are not accustomed to its sensitivity...
...Which brings me to a point I made a while earlier that pilots and autopilots are constantly making small adjustments to the controls (in all directions of flight, up, down, and other) in order to keep at level and true flight. If all of those instantaneous control adjustments (up, down, and other) are added up over a long period/long distance, it could be seen that to follow the VSI to keep a constant altitude, the plane will follow the curvature of the air pressure above the curved Earth.
So while a pilot does not need to "mindfully" dip the nose in order to follow the curvature of the Earth, that curvature would show itself in the sum of the component adjustments a plane makes in the normal course of flying level over a long distance.
originally posted by: Zaphod58
a reply to: turbonium1
If you fly a plane in a constant descent, that means you are losing altitude constantly. If you're losing altitude constantly, eventually you end up at 0 feet. If your VSI shows a 500 foot per minute descent, and you're at 500 feet, then in one minute, you will have flown into the ground.
originally posted by: Zaphod58
a reply to: turbonium1
Wrong. There's a difference between pointing the nose and descending. You can point the nose without climbing or descending. Over a sphere or a flat earth, if you fly at a constant descent, you're going to crash.
originally posted by: Zaphod58
a reply to: turbonium1
A descent is a descent, regardless of if the earth is flat or not. If you're flying over a sphere, you descend to land. If you're flying over a flat earth, you descend to land. If you descend in either case, you are going to impact the ground. You can point the nose up or down, and not climb or descend.
originally posted by: OneBigMonkeyToo
a reply to: turbonium1
And where did anyone say it that there are lots of different pressure layers?
VSI measures pressure in the instrument, nowhere else.
Your complete lack of knowledge is getting badly exposed now. Give it up.
The VSI measures ascent, descent, and level flight. How do planes fly around a sphere without any descent? Because it's not a sphere at all.
Correct on both counts.
originally posted by: turbonium1
originally posted by: Zaphod58
a reply to: turbonium1
A descent is a descent, regardless of if the earth is flat or not. If you're flying over a sphere, you descend to land. If you're flying over a flat earth, you descend to land. If you descend in either case, you are going to impact the ground. You can point the nose up or down, and not climb or descend.
A sphere is a curved surface. A plane has to fly a curved path to follow above the surface, to maintain the same altitude.
Why would such a descent 'impact the ground' when it holds the same altitude above the sphere, throughout the flight?
originally posted by: ignorant_ape
a reply to: turbonium1
The VSI measures ascent, descent, and level flight. How do planes fly around a sphere without any descent? Because it's not a sphere at all.
NO
a VSI measures change in barometric pressure - it REPORTS asscent // descent by inference
this has been explained to you so many different ways - it hurts
but still you persist in your delusions
hypothetical annecdote :
an aircraft is flying over a spherical planet [ equitorial diameter 12000km ] @ ASL 10000m . its velocity [ over ground = 700kph . the VSI reports no asccent // descent .
it flies for 90minuites from its " last waypoint ^ ] - what is its altitude at waypoint # 2 ?
originally posted by: Hyperboles
Correct on both counts.
originally posted by: turbonium1
originally posted by: Zaphod58
a reply to: turbonium1
A descent is a descent, regardless of if the earth is flat or not. If you're flying over a sphere, you descend to land. If you're flying over a flat earth, you descend to land. If you descend in either case, you are going to impact the ground. You can point the nose up or down, and not climb or descend.
A sphere is a curved surface. A plane has to fly a curved path to follow above the surface, to maintain the same altitude.
Why would such a descent 'impact the ground' when it holds the same altitude above the sphere, throughout the flight?
Compared to space yes the plane is descending all the time, but the VSI and Altimeter essentially are reading the height of the air column above it and in level flight over a curved surface, this is not changing, so the VSI AND ALTIMETER WILL STAY PUT EVEN IF THE PLANE IS DESCENDING COMPARED TO SPACE.
This to help you out with the most simplistic explanation.
originally posted by: turbonium1
originally posted by: OneBigMonkeyToo
a reply to: turbonium1
And where did anyone say it that there are lots of different pressure layers?
VSI measures pressure in the instrument, nowhere else.
Your complete lack of knowledge is getting badly exposed now. Give it up.
What 'pressure layers' hold planes around a curvature, and suggest this is being in 'level' flight?
The VSI measures ascent, descent, and level flight. How do planes fly around a sphere without any descent? Because it's not a sphere at all.
Where is all that 'missing curvature' over a 6 hour flight?