The document is a presentation from the Mechanical Engineering Department of Vishwakarma Institute of Technology, Pune, addressing the gyroscopic effects on planes and ships. It explains key concepts such as gyroscopes, gyroscopic couples, and their impacts during maneuvers like steering, pitching, and rolling. Different scenarios are detailed, showcasing the results of rotor rotations on the movements of both aircraft and vessels.

1. Vishwakarma Institute Of Technology, Pune.
(An Autonomous Institute Affiliated to the Savitribai Phule Pune University)
DepartmentOf Mechanical Engineering
Dynamics Of Machines
Presentation on
Gyroscopic effects on Planes & Ships

2. Introduction
• What is a Gyroscope ?
• Meaning of Gyroscopic couple ?
• Why to study its effect ?

3. 1) Axes
• Axis of spin
• Axis of Precession
• Axis of gyroscopic couple
2) Planes
• Plane of spin
• Plane of precession
• Plane of gyroscopic couple
Terminologies

4. GYROSCOPIC EFFECTS ON
AN AIRPLANE

5. Understanding the basic movements

6. During Steer (Yaw motion)
Steer direction Result
Left
Nose raises, tail
lowers
Right
Nose lowers, tail
raises
Case 1
When the rotor is
turning clockwise
(viewed from the tail)

7. Case 2
When the rotor is
turning anti-clockwise
(viewed from the tail)
During Steer (Yaw motion)
Steer direction Result
Left
Nose lowers, tail
raises
Right
Nose raises, tail
lowers

8. During Pitch
Case 1
When the rotor is
turning clockwise
(viewed from the tail)
Movement Result
Pitch Up Right Yaw
Pitch Down Left Yaw

9. Case 2
When the rotor is
turning anti-clockwise
(viewed from the tail)
During Pitch
Movement Result
Pitch Up Left Yaw
Pitch Down Right Yaw

10. During Roll
As in rolling, the axis of spin & axis
of precession are parallel,
No gyroscopic couple acts on the
plane

11. Gyroscopic effects
on a ship
• While Steering
• While Pitching
• While Rolling

12. Terms used to denote the directions of a ship

13. While Steering
The re-active gyroscopic couple on the ship results in
pitching motion
Case 1
When the rotor is
turning clockwise
(viewed from stern)
Steer direction Result
Left Bow raises, stern lowers
Right Bow lowers, stern raises

14. Case 2
When the rotor is turning
Anti-clockwise
(viewed from stern)
Steer direction Result
Left
Bow lowers, stern
raises
Right
Bow raises, stern
lowers
While Steering

15. While Pitching
The re-active gyroscopic couple on the ship
results in Yaw motion
Case 1
When the rotor is
turning clockwise
(viewed from stern)
Movement Resulting turn
Pitch Up Starboard
Pitch Down Port

16. Case 2
When the rotor is
turning Anti-clockwise
(viewed from stern)
Movement Resulting turn
Pitch Up Port
Pitch Down Starboard
While Pitching

17. While Rolling
No gyroscopic couple acts on the ship
while rolling
As in rolling, the axis of spin & axis
of precession are parallel,
No gyroscopic couple acts on the
ship

18. Presented By
Name Roll No.
Prathmesh Lonkar 82
Mechanical Engineering
Third Year
Division-S