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Questions tagged [gyroscopic-instruments]

Questions about instruments which rely on gyroscopes to function, such as attitude indicators.

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Gyro Erection System

I have a hard time understanding the physics behind the pneumatic erecting system in an attitude indicator. According to my book and the linked image, the applied force is “precessed 90 degrees” (anti-...
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1answer
58 views

How does turning Errors in the Air Driven Artificial Horizon work?

Turning through 90°, 180°, 270° & 360°, the error is different. I can understand what is turning error and pitch error individually. But why turning through different degree, the resulting error ...
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2answers
142 views

What is the most effective way for a VFR pilot to scan the instruments during manoeuvres?

May I ask your opinion on what is the best and most effective pattern for a VFR pilot to scan their instruments during manoeuvres?
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2answers
252 views

Why does the turn coordinator ball move to the right during a climb?

In a light aircraft like a C172 or PA-28, during a climb the ball in the turn coordinator moves to the right. Why?
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3answers
723 views

During “partial panel” flying, in what ways is a turn rate indicator more useful than a turn coordinator?

This question deals with flying by reference to old-fashioned "steam gauges", not a modern "glass cockpit". I recall hearing some pilots very experienced (ATP) pilots advocate for the older-style "...
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0answers
43 views

How does a standby ADI remain accurate when flying over the curved earth? [duplicate]

How does a standby attitude directional indicator remain accurate when flying for many hours over the curve of the earth? While maintaining level flight, wouldn’t the pilot see an apparent movement of ...
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1answer
201 views

Is the pod on the right wing of the PC-12 and Cessna 208 a gyrocompass? [duplicate]

Hello avgeeks, First time posting here looking for an answer. Could someone tell me what's located inside that pod on the right wing of some planes like this Pilatus PC12 or this Caravan 208? I guess ...
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2answers
660 views

How to handle vacuum and turn coordinator failure in IMC?

I just earned my FAA instrument rating and a considerable amount of time was spent training partial panel. This meant flying with no vacuum gyro instruments - attitude indicator and directional gyro. ...
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1answer
210 views

What instruments are used to indicate aircraft attitude in acrobatic airplanes?

As aerobatic airplanes don’t use gyroscopic instruments such as attitude indicators, what instruments are used to indicate the aircraft’s attitude in flight?
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2answers
237 views

Do air-driven gyroscopic instruments suffer from icing or any blockage of filter?

Do gyro instruments suffer from icing in an air-driven gyro system? Do they have any particular way to protect them against blockages of filter or any type of other blockage? (Alternate source?) I am ...
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3answers
4k views

How did the gyro gunsights of WW2 get the range and lead of a target?

I just read this article on the gyro gunsight, but I don't understand how it computed range/position to the target and then calculated how much lead is needed. Surely it must have had radar to get ...
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1answer
1k views

What are the pros and cons of vacuum and pressure gyros?

Inspired by this question, I would like to know what the pro's and con's of the mostly used vacuum-gyro and the less used high-pressure-gyro is. Side-question: Are there any other ways to make the ...
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2answers
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How does a gyro compass indicate true heading?

From what I've researched, a gyro compass is usually calibrated with with reference to a magnetic compass. Once you've engaged the gimbal locks, and start to rotate the compass to a magnetic heading; ...
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0answers
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How are gyro's used on a turn indicator?

So I understand how precession works, and that gimbals are used to isolate the gyro from outside rotation, however when a yawing motion is applied to the gyro, it'll essentially translate to a rolling ...
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1answer
557 views

At what altitude do vacuum powered gyros become ineffective?

Obviously, in space a vacuum powered gyro would not work because there is no air to move, but, how high do you have to go before they are unable to spin fast enough to work properly? would a vacuum ...
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1answer
554 views

Why vacuum instead of pressure to power gyros?

Why are most air powered gyro instruments powered by vacuum rather than positive pressure?
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4answers
1k views

How do modern avionics work without vacuum pumps or gyroscopes?

I'm going to be taking my checkride soon on a Skycatcher 162. It has an all glass cockpit utilizing the Garmin G300, and its my understanding that it does not utilize gyroscopes or vacuum pumps for ...
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1answer
187 views

How does the control-board on small drones govern their flight?

I saw this YouTube clip for a light weight drone, under a few ounces, with very impressive maneuverability. They used styrofoam for frame and taped the rotors and battery and the control chip to it. ...
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1answer
446 views

Does an RMI show true or magnetic north?

Does the compass card of a Radio Magnetic Indicator (RMI) point to true north or magnetic north ?
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1answer
392 views

Why is the Inertial Reference System not used to determine true altitude?

Given three very accurate laser gyros and accelerometers I believe the Inertial Reference System (IRS) should be as accurate in determining true altitude as it is in determining lat/long, providing ...
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2answers
8k views

How does a horizontal situation indicator (HSI) work?

I am trying to understand the Horizontal Situation Indicator. To my understanding there is a slaving transmitter, usually in a wing (the left wing in the Piper Archer and Seminole), which sends ...
2
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2answers
807 views

How do gyroscopic instruments work? [closed]

I'm trying to better my understanding of the physics behind gyroscopic instruments in an aircraft. I am aware that a spinning gyroscope creates rigidity in space by resisting applied forces. But, what ...
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1answer
603 views

What and when was the first gyroscopic flight instrument introduced?

One of things which consistently amazes me about flight is the exceptional progress in the early decades of flight - especially in terms of avionics. Wikipedia tells me that the first ILS landing was ...
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2answers
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Why Heading Indicator is not magnetic itself and need magnetic compass?

I read this while I was preparing for my knowledge test: The heading indicator is not direction-seeking. It is important to check its indication frequently and reset it with reference to the ...
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2answers
223 views

What kind of Gyros are being used in smaller regional jets?

As per my understanding, most of the Gyros in big jets are electric driven but I am not sure if the smaller planes also have the electric driven or vacuum/pressure driven Gyros?
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2answers
3k views

If I fly a balanced turn long enough, will the AI show I'm level?

Attitude Indicators are essentially gyroscopes. Mechanical gyroscopes have a "rigidity in space" property, which allows them to preserve their orientation when the support rotates. However, like ...
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1answer
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What does the suction gauge actually show?

If I recall correctly correctly the vacuum suction gauge in the TB10 has a scale from 3 to 6, with the green range being 4 to 5 (I might slightly off on those numbers though). It's clearly marked as ...
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3answers
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How much lag does an Attitude Indicator experience?

How much lag does an Attitude Indicator exhibit when it is working as designed? Other than well-known problems like tumbling beyond certain limits in pitch and roll, and precession errors from the ...