Chapter 9

Landing Gear Design

Table of Contents

. . 9.1. Introduction. 3

9.2. Design Requirements and Design Flowchart 4

9.3. Landing Gear Configuration. 7

9.3.1. Single Main. 8

9.3.2. Bicycle. 9

9.3.3. Tail-gear 9

9.3.4. Tricycle. 11

9.3.5. Quadricycle. 11

9.3.6. Multi-bogey. 12

9.3.7. Releasable Rail 12

9.3.8. Skid. 12

9.3.9. Seaplane Landing Device. 12

9.3.10. Human Leg. 14

9.3.11. Landing Gear Configuration Selection Process. 15

9.3.12. Landing Gear Attachment 15

9.4. Fixed, Retractable, or Separable Landing Gear 16

9.5. Landing Gear Geometry. 19

9.5.1. Landing Gear Height 19

9.5.2. Wheel Base. 23

9.5.3. Wheel Track. 26

9.6. Landing Gear and Aircraft Center of Gravity. 33

9.6.1. Tipback and Tipforward Angles Requirements. 34

9.6.2. Take-off Rotation Requirement 35

9.7.  Landing Gear Mechanical Subsystems/Parameters. 41

9.7.1. Tire Sizing. 41

9.7.2. Shock Absorber 42

9.7.3. Strut Sizing. 43

9.7.4. Steering Subsystem.. 43

9.7.5. Landing Gear Retraction system.. 43

9.8. Landing Gear Design Steps. 44

9.9. Landing Gear Design Example. 45

Problems. 56

References. 61