nac
Well-Known Member
I see an add in this months pbo an ad it includes a gyro 6002.
can you explain in laymans words,what it is and its function.
nac.
can you explain in laymans words,what it is and its function.
nac.
gyro6002
- Thread starter nac
- Start date
sarabande
Well-Known Member
Probably the compass (gyro unit) for the ST 6002 autopilot ?
It provides input from the earth's magnetic field to the autopilot, which then uses the boat's heading as a reference to the course required, and makes the necessary adjustments to the rudder(s) to steer the vessel along the desired course.
It provides input from the earth's magnetic field to the autopilot, which then uses the boat's heading as a reference to the course required, and makes the necessary adjustments to the rudder(s) to steer the vessel along the desired course.
john_morris_uk
Well-Known Member
[ QUOTE ]
Probably the compass (gyro unit) for the ST 6002 autopilot ?
It provides input from the earth's magnetic field to the autopilot, which then uses the boat's heading as a reference to the course required, and makes the necessary adjustments to the rudder(s) to steer the vessel along the desired course.
[/ QUOTE ]
I haven't seen the ad, but some of the Raymarine Autopilots (including ours) have both a fluxgate compass AND an electronic gyro. The gyro determines yaw and rate of yaw and helps the course computer sort out helm corrections. All I know is that ours works very very well. Perhaps its this additional feature which is being referred to?
Probably the compass (gyro unit) for the ST 6002 autopilot ?
It provides input from the earth's magnetic field to the autopilot, which then uses the boat's heading as a reference to the course required, and makes the necessary adjustments to the rudder(s) to steer the vessel along the desired course.
[/ QUOTE ]
I haven't seen the ad, but some of the Raymarine Autopilots (including ours) have both a fluxgate compass AND an electronic gyro. The gyro determines yaw and rate of yaw and helps the course computer sort out helm corrections. All I know is that ours works very very well. Perhaps its this additional feature which is being referred to?
William_H
Well-Known Member
A gyro by nature is a weighted wheel spinning in space. It is usually mounted in a gymbal so that it is free to rotate in any plane . More specifically the gyro is free to remain rigid in space while the carrier (boat) rotates and pitches.
One type of gyro is then slowly forceably aligned to the magnetic heading of the boat.( electric signals from compass card) So it becomes essentially aligned to magnetic north. The gyro is very rigid in space and so the tiniest of deviation from the chosen magnetic heading is measurable for A/P and is far more acurate than a wildly swinging magnetic compass card.
Another type of gyro is called the rate gyro and is rigidly mounted aligned to fore and aft of the boat. when the gyro is forced to rotate with the rotation of the boat it reacts by trying to tilt in an axis 90 degrees from the boat c/l this reaction is allowed against a spring.
The result is a movement against a spring which is directly proportional to the rate of turn of the boat. This data can be electrically sensed and used by the a/p to supplement the magnetic compass card information to acheive a better course control.
And while we are on the subject another gyro is called a gyro compass. it is only used on large ships AFAIK. The rotating gyro wheel finds itself after many hours to be rotating because the earth is rotating. If it is allowed it will align itself with the rotation of the earth (east west) So it gives an accurate compass which is independant of earths magnetic field and always points to true north. The problem being it has to be spinning for near 24 hours before it will give a good indication and must be kept spinning for the entire voyage.
So there is run down on gyro theory. good luck olewill
One type of gyro is then slowly forceably aligned to the magnetic heading of the boat.( electric signals from compass card) So it becomes essentially aligned to magnetic north. The gyro is very rigid in space and so the tiniest of deviation from the chosen magnetic heading is measurable for A/P and is far more acurate than a wildly swinging magnetic compass card.
Another type of gyro is called the rate gyro and is rigidly mounted aligned to fore and aft of the boat. when the gyro is forced to rotate with the rotation of the boat it reacts by trying to tilt in an axis 90 degrees from the boat c/l this reaction is allowed against a spring.
The result is a movement against a spring which is directly proportional to the rate of turn of the boat. This data can be electrically sensed and used by the a/p to supplement the magnetic compass card information to acheive a better course control.
And while we are on the subject another gyro is called a gyro compass. it is only used on large ships AFAIK. The rotating gyro wheel finds itself after many hours to be rotating because the earth is rotating. If it is allowed it will align itself with the rotation of the earth (east west) So it gives an accurate compass which is independant of earths magnetic field and always points to true north. The problem being it has to be spinning for near 24 hours before it will give a good indication and must be kept spinning for the entire voyage.
So there is run down on gyro theory. good luck olewill
spannerman
Well-Known Member
The descriptions are a little misleading regarding Raymarines products, the Gyro compass should be more accurately called a gimballed compass, it has no rotating parts and is just 8 coils mounted horizontally and gimballed to alleviate the vessels motion so that they remain horizontal as much as possible. The rate gyro is a circuit board in the course computer and is composed of 3 accelerometers one for each plane of movement which fine tune the autopilots function by adding more data on the vessels movement than can be supplied by the compass alone. And as others have noted once you have had one you will never go back to a 'compass only ' system.
john_morris_uk
Well-Known Member
[ QUOTE ]
A gyro by nature is a weighted wheel spinning in space. It is usually mounted in a gymbal so that it is free to rotate in any plane . More specifically the gyro is free to remain rigid in space while the carrier (boat) rotates and pitches.
One type of gyro is then slowly forceably aligned to the magnetic heading of the boat.( electric signals from compass card) So it becomes essentially aligned to magnetic north. The gyro is very rigid in space and so the tiniest of deviation from the chosen magnetic heading is measurable for A/P and is far more acurate than a wildly swinging magnetic compass card.
Another type of gyro is called the rate gyro and is rigidly mounted aligned to fore and aft of the boat. when the gyro is forced to rotate with the rotation of the boat it reacts by trying to tilt in an axis 90 degrees from the boat c/l this reaction is allowed against a spring.
The result is a movement against a spring which is directly proportional to the rate of turn of the boat. This data can be electrically sensed and used by the a/p to supplement the magnetic compass card information to acheive a better course control.
And while we are on the subject another gyro is called a gyro compass. it is only used on large ships AFAIK. The rotating gyro wheel finds itself after many hours to be rotating because the earth is rotating. If it is allowed it will align itself with the rotation of the earth (east west) So it gives an accurate compass which is independant of earths magnetic field and always points to true north. The problem being it has to be spinning for near 24 hours before it will give a good indication and must be kept spinning for the entire voyage.
So there is run down on gyro theory. good luck olewill
[/ QUOTE ]Good outline theory Will, but there is yet another 'electronic' Gyro and that is the one that Raymarine use. Perhaps Raymarine shouldn't call it a gyro, but a rotation sensor. It uses a semiconductor laser and some clever trickery to produce a voltage proportional to rate of rotation.
This is IN ADDITION to the fluxgate compass that is gimballed and in the little cup shaped box you mount on a bulkhead.
I have a friend who works with solid state rotation sensors (or gyros) and we have both a fluxgate compass and an electronic rate gyro in our Autopilot. The gyro is an optional extra and improves steering and MARPA accuracy when the Seatalk bus is feeding a suitable Radar.
A gyro by nature is a weighted wheel spinning in space. It is usually mounted in a gymbal so that it is free to rotate in any plane . More specifically the gyro is free to remain rigid in space while the carrier (boat) rotates and pitches.
One type of gyro is then slowly forceably aligned to the magnetic heading of the boat.( electric signals from compass card) So it becomes essentially aligned to magnetic north. The gyro is very rigid in space and so the tiniest of deviation from the chosen magnetic heading is measurable for A/P and is far more acurate than a wildly swinging magnetic compass card.
Another type of gyro is called the rate gyro and is rigidly mounted aligned to fore and aft of the boat. when the gyro is forced to rotate with the rotation of the boat it reacts by trying to tilt in an axis 90 degrees from the boat c/l this reaction is allowed against a spring.
The result is a movement against a spring which is directly proportional to the rate of turn of the boat. This data can be electrically sensed and used by the a/p to supplement the magnetic compass card information to acheive a better course control.
And while we are on the subject another gyro is called a gyro compass. it is only used on large ships AFAIK. The rotating gyro wheel finds itself after many hours to be rotating because the earth is rotating. If it is allowed it will align itself with the rotation of the earth (east west) So it gives an accurate compass which is independant of earths magnetic field and always points to true north. The problem being it has to be spinning for near 24 hours before it will give a good indication and must be kept spinning for the entire voyage.
So there is run down on gyro theory. good luck olewill
[/ QUOTE ]Good outline theory Will, but there is yet another 'electronic' Gyro and that is the one that Raymarine use. Perhaps Raymarine shouldn't call it a gyro, but a rotation sensor. It uses a semiconductor laser and some clever trickery to produce a voltage proportional to rate of rotation.
This is IN ADDITION to the fluxgate compass that is gimballed and in the little cup shaped box you mount on a bulkhead.
I have a friend who works with solid state rotation sensors (or gyros) and we have both a fluxgate compass and an electronic rate gyro in our Autopilot. The gyro is an optional extra and improves steering and MARPA accuracy when the Seatalk bus is feeding a suitable Radar.