# Gyroscopes as Evidence for a Spherical and Rotating Earth

#### Jonathan Evans

##### New Member
you guys are awesome, the last thing to put the conspiracy for me to bed is the Coriolis effect, and how the gyros in planes show no curvature as they do not alter, as they stay flat through out the entire flight or is this all about a sense of scale again ?

#### Mick West

Staff member
you guys are awesome, the last thing to put the conspiracy for me to bed is the Coriolis effect, and how the gyros in planes show no curvature as they do not alter, as they stay flat through out the entire flight or is this all about a sense of scale again ?

You'd need to supply more detail as to how that is supposed to work, with the actual claims made, and how it was measured, and by who, and when, and the math.

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#### Henk001

##### Senior Member.
you guys are awesome, the last thing to put the conspiracy for me to bed is the Coriolis effect, and how the gyros in planes show no curvature as they do not alter, as they stay flat through out the entire flight or is this all about a sense of scale again ?
I don't understand what troubles you about the coriolis force; it confirms the rotation of the earth. (please add a clarification).
Gyros in planes DO show curvature. They show apparent drift, apparent topple and transport wander. I am told that pilots learn to adjust every 10 to 15 minutes for that if they have to rely on them.
Alignment of Gyroscopes

Orientation of a gyro in space can be defined by specifying the alignment of the axis of rotation.
A vertical gyro has its spin axis in the earth vertical.
A horizontal gyro has its axis in the earth horizontal.
However earth horizontal is a plane and not a line so this does not give sufficient information to fully define the axis.
To fully define we have to add the azimuth information.
e.g. A horizontal gyro with its axis aligned with true north.

Gyroscopic Wander

The rigidity of a gyro system will tend to keep the spin axis fixed in space.
Any movement away from this fixed direction is called wander.
Gyro wander can be either drift or topple.
These are earth references.
Gyro drift occurs when the spin axis turns in the earth horizontal plane.
Gyro topple occurs when the axis tilts in any earth vertical plane.

Real Wander

Whenever the gyro spin axis moves away from its initial defined orientation in space the gyro is said to suffer from real wander.
Real wander can be deliberately induced by applying an external correcting force e.g. alignment of tied gyros.
Real wander can be caused by imperfections in the gyroscope, unbalanced gimbals or bearing friction.
A perfect gyro with no external forces acting on it will not suffer from real wander.

Apparent Wander

Having said that perfect gyros do not suffer from real wander there are many occasions when they appear to.
This is because our orientation in space has changed while the gyro's orientation has not.
This is apparent wander.
A Horizontal gyro at the equator with its axis aligned to the local meridian shows no apparent drift as it is carried round on the rotating earth.

A Horizontal gyro at the North Pole shows an apparent drift of 15° per hour as the earth rotates under it.
The apparent drift (zero at equator and 15° per hour at poles) is a function of Latitude.
So Apparent Drift = 15 x Sin (Latitude)° per hour.

A vertical gyro at the equator appears to become a horizontal gyro then becomes a vertical gyro again as it is carried round on the rotating earth.

It is showing apparent topple at a rate of 15° per hour.
A Vertical gyro at the North Pole shows no apparent topple as the earth rotates under it.
The apparent topple (zero at poles and 15°/hr at equator) is a function of Latitude.
So Apparent Topple = 15 x Cos (Latitude)° per hour.
A gyro which begins as a horizontal gyro aligned with the local meridian at an intermediate Latitude shows both apparent drift and apparent topple as it is carried around on the rotating earth.
Its apparent drift is 15 x Sin (Lat) and its apparent topple is 15 x Cos (Lat) per hour.

Transport Wander

If a gyro is aligned to north on one part of the earth and then moved to another it will be out of alignment.
This is due to convergency between the two points.
This is a form of apparent drift and is called "Transport Wander".
Flights north or south produce no transport drift but will affect the total apparent drift (due to latitude change).
Flights to the east increase the total apparent drift (in the Northern Hemisphere) and those to the west will reduce it.

Content from External Source
source: http://www.theairlinepilots.com/forum/viewtopic.php?t=902

#### Z.W. Wolf

##### Senior Member.
you guys are awesome, the last thing to put the conspiracy for me to bed is the Coriolis effect, and how the gyros in planes show no curvature as they do not alter, as they stay flat through out the entire flight or is this all about a sense of scale again ?

It's not about scale. It's just wrong. Flat earthers have built a completely unrealistic model of what gyroscopes and gyrocompasses do, but they present it as fact.

#### Henk001

##### Senior Member.
There are FE claims about gyroscopes not showing the rotation of the earth. They show a video of a toy gyroscope that should in theory (conservation of angular momentum) show apparent drift in the course of, say, 1/2 'n hour, but it doesn't. The trouble with these claims is that the rigidity of that gyroscope is not enough to follow the very slow rotation of the earth. In planes they use better gyroscopes (with less friction in the attachment points of the axes of rotation and a larger moment of inertia) and the relative rotation of the gyroscope environment is faster because the plane's movement adds up with the earth's.
To explain what is going wrong in those video's you can compare it with the well known experiment to show the law of inertia (conservation of momentum, Newton's 1st law) by pulling a tablecloth away from under plates and drinking glasses etc. covering a table. You have to do that very quickly and/or use a very smooth tablecloth, otherwise you'll end up with a great mess on the floor. In other words: what's on the table (almost) stays in it's place only if the friction force between cloth and plates etc. can't deliver the acceleration that you give to the tablecloth.
There is a way of getting around the friction problem all together: using ring laser gyros. In bigger modern aircrafts they have replaced the gimballed gyros. The next video explaines how it works.

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