Gyrocompass consist of a spinning wheel
mounted on gimbal so that the wheel's axis is
free to orient itself in any way.
When it is spun with its axis pointing in some
direction, such a wheel will maintain its axis
A gimbal is constructed in such a way that no
external torque acts on the axis of rotation of
a) For Navigation
b) To Stabilize Airplane and Ship
For assisting navigation the axis of rotation
of gyro is aligned to point towards the
Since no external torque acts on the axis of
rotation the gyro will always point towards
geographical north irrespective of the motion
A Gyrocompass is mounted on Airplane or Ship.
Variation in alignment of gimbal frame w.r.t axis
of rotation of gyro is used judge the amount of
pitch, roll and yaw experienced by Airplane or
The degree of pitch , yaw or roll experienced by
the ship is measured and converted into
electrical signal by a transducer which is then
send to the pilot or captain of the ship.
Seeks geographic (true)
north instead of magnetic.
Gimbal lock occur when two
axis align parallel to each
Can be used near the earth’s
magnetic poles, where
magnetic compass is useless.
Requires a constant source of
electrical power and is sensitive
to power fluctuations.
Unaffected by surrounding
Requires periodic maintenance
by qualified technicians.
a. DIAMETER = 178.8 mm.
b. MASS = 1.5 kg.
a. DIAMETER = 19.5 mm.
b. Nos. = 6
PIPE (G I)
a. DIAMETER = 19.5 mm.
b. LENGTH = 6 m.
Make a 3 axis gimbal and provide
necessary joints to mount the gyro.
Attach the gyro to the gimbal and provide
Align the gyro axis pointing a specific
direction, say North.
Test the instrument by providing torque
on frames of gimbal.
For a rotating gyro with mass ‘M’ and radius
Angular momentum is given by:퐿 = 푀 ∗ 푣 ∗ 푟
Where ‘푣’ is the tangential velocity of gyro.
The value of angular momentum should be
large enough to oppose any torque which the
gyro experience due to self-weight.
Component Specification Cost (Rupees)
Bearing 6.nos 300
Disc 1 100
G I Pipe 6meters 440
Nuts and Bolts 8.nos 30
Paint 3 Bottles 278
A 3-axis Gimbal gyrocompass is constructed
and is tested for accuracy.
Gyrocompass - Wikipedia, the free
Gimbal - Wikipedia, the free encyclopedia
YOUTUBE: MIT Open Course Ware Lec. 24 |
8.01 Physics I: Classical Mechanics, Fall 1999