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Ice
see
Water
Impact Pressure
Definition, 69026
Equations and Graphs for Variation With Calibrated Airspeed, 69026
Measurement in Flight
see
Anemometric Data Correction
Impedance
Acoustic
see
Acoustic Impedance
Impingement Drag
Due to Skin Friction on Airframe of Tyre Sidespray for Runway Contaminated With Slush/Water, 98001, TM 165, TM 192
airframe geometry representation used to simplify calculation of spray-wetted areas, 98001, TM 165, TM 192
comparison of predictions with values deduced from experiments on various aircraft, 98001, TM 165, TM 192
description of development of prediction method, 98001, TM 165, TM 192
discussion of effects of contaminant depth, tyre pressure, speed and airframe geometry, 98001, TM 165, TM 192
equation used for skin friction coefficient, 98001, TM 165, TM 192
Incidence Angles
see also
Angle of Attack
Angles in Aircraft Dynamics
definitions, 67037
relationship to attitude angles, 67037
Indexing Mechanisms
see
Geneva Mechanisms
Indicated Airspeed
see also
Calibrated Airspeed
Correction to Measured Values
see
Anemometric Data Correction
Definition, 86031
Equations for Relationship With Pressures, 86031
Indicial Aerodynamics
Aerofoils
chordwise load history for step in heave or pitch, 84020
indicial functions in subsonic or supersonic flow, 84020
Introduction to Use in Gust Response Calculation, 84020
calculation of load alleviation with active controls, 84020
Kussner Functions
derivation and values, 84020
Lifting Surfaces in Combination or Isolation
hereditary functions for use in time domain, 84020
indicial functions with or without leading- or trailing-edge controls, 84020
Wagner Functions
derivation and values for delta, rectangular and swept wings, 84020
Induced Drag
see
Lift Dependent Drag
Trailing Vortex Drag
Induction Hardening
Effect on Fatigue Strength
plain shafts with interference-fit collars, 68005
splined steel shaft assemblies, 73002
Influence on Gear Design, 68040, 88033
Use to Improve Fatigue Strength of Steels
advantages and limitations, 89031
comparison with other possible surface treatments, 89031
Use to Reduce Wear in Disc Cams, 94017
Inelastic Behaviour
see
Aluminium Alloys
Beams in General
Beams of Angle Section
Beams of Any Hollow or Solid Polygonal Section
Beams of Channel Section
Beams of Circular Section
Beams of I-section
Beams of Rectangular Tubular Section
Beams of T-section
Beams of Unlipped Z-section
Bonded Double- or Single-lap Joints
Bonded Double-lap Joints
Bonded Single-lap Joints
Corrugated Plates
Crack Propagation
Cylinders of Circular Section (Strength and Vibration)
Flange Buckling
Flat Panels with Flanged Integral Stiffeners
Flat Panels with Lipped or Unlipped Z-section Stiffeners
Flat Panels with Top-hat Section Stiffeners
Flat Panels with T-section Integral Stiffeners
Flat Panels with Unflanged Integral Stiffeners
Flat Panels with Unlipped Z-section Stiffeners
Flat Rectangular Plates
Flat Sandwich Panels (Cores of Negligible Flexural Stiffness)
Flat Sandwich Panels (Isotropic Cores)
Flat Strips of Isotropic Materials
Materials Properties
Steels
Stress Concentration
Stress Intensity Factors
Stress-strain Curves
Struts in General
Struts of Channel Section
Struts of I-section
Struts of Lipped or Unlipped Z-section
Struts of Tubular Section
Inertia Cross-coupling in Roll
see
Rolling
Inertial System
Use in Analysis of Flight-Measured Performance Data, 79018
Use in Determination of Wind Velocity in Flight, 79018
Inertias
Axes Transformation, 67004, 86041
Inferential Flowmeters
Pressure Drop Across, 66030
Infrared Thermometry
see
Temperature Measurement
Initial Irregularities
Cylinders Under Compression
statistical analysis of effect on local buckling, 83034
Flat Panels Under Compression
description of effect on buckling, 72012
Struts Under Compression
see
Struts in General
Injection
see
Boundary Layer
Inlets
see
Intakes
Inoperative Engine
Calculation of Loading on Fin, Fuselage, Tailplane and Wing in Flight With, 01010
Estimation of Trim Drag Due to
see
Asymmetric Flight
Turbo-Fan or Turbo-Jet
calculation of drag with rotor locked or windmilling, 84005
drag of uninstalled with rotor locked, 81009
mass flow through uninstalled with rotor locked, 81009
Inspection
see
Non-destructive Examination
Instability
see
Beams in General
Beams of Sandwich Construction
Buckling
Corrugated Plates
Curved Rectangular Plates
Curved Specially-orthotropic Rectangular Plates
Cylinders of Circular Section (Strength and Vibration)
Faceplate Wrinkling
Flange Buckling
Flat Panels in General
Flat Panels with Fibre-reinforced Unflanged Integral Stiffeners
Flat Panels with Flanged Integral Stiffeners
Flat Panels with Lipped or Unlipped Z-section Stiffeners
Flat Panels with Top-hat Section Stiffeners
Flat Panels with Transverse Stiffeners
Flat Panels with T-section Integral Stiffeners
Flat Panels with Unflanged Integral Stiffeners
Flat Panels with Unlipped Z-section Stiffeners
Flat Parallelogram Panels
Flat Parallelogram Plates
Flat Plates Tapered in Plan
Flat Rectangular Plates
Flat Rectangular Plates Tapered in Thickness
Flat Sandwich Panels (Cores of Negligible Flexural Stiffness)
Flat Sandwich Panels (Corrugated Cores)
Flat Sandwich Panels (Isotropic Cores)
Flat Sandwich Panels (Truss Cores)
Flat Specially-orthotropic Rectangular Plates
Flat Square Plates with Central Circular Hole
Flat Square Plates with Central Flanged Circular Hole
Flat Triangular Plates
Flat Unbalanced Laminated Rectangular Plates
Helical Springs of Round Wire
Inter-rivet Buckling
Journal Bearings
Struts in General
Struts of Bulb Angle Section
Struts of Channel Section
Struts of I-section
Struts of Lipped or Unlipped Z-section
Struts of Sandwich Construction
Struts of Thin-walled Open Section
Struts of Tubular Section
Installation
Powerplant/Airframe Interference Effects of Noise
see
Turbo-fan and Turbo-jet Engines
Powerplant/Airframe Interference Effects on Thrust/Drag Accounting
see
Drag
Instantaneous Centre of Rotation
Of Cam and Follower
determination, ME2
Instrumentation
see
Accelerometers
Ambient Temperature
Flowmetering Devices
Platinum Resistance Thermometers
Temperature Measurement
Thermistors
Thermocouples
Viscometers
Insulating Oils
Typical Values of Density, 71003
Typical Values of Dynamic and Kinematic Viscosity, 71003
Insulation
see
Refractory Lining Materials
Intakes
see also
Annular Diffusers
Conical Diffusers
Cowls
Critical Conditions in Fluid Flow
Diffusers
One-dimensional Flow
Plane-walled Diffusers with Single-plane Expansion
Pre-entry Drag
Spillage Drag
Turbo-fan and Turbo-jet Engines
Approximate Estimation of Pressure Recovery During Take-Off, 77001
Cooling air
in propellor installation drag accounting, 85015
Efficiency Relationships, 66028
Estimation of Pressure Recovery of Axisymmetric, 80037
diffuser loss, 80037
effect of engine mass flow demand, 80037
inlet choking Mach number, 80037
lip (rounded or sharp) loss at zero or non-zero incidence, 80037
loss due to interaction of inlet flow with diffuser, 80037
Flush With NACA Convergent-Divergent Planform
captured mass flow, drag and pressure recovery, 86002
Flush With Rectangular Planform
drag and pressure recovery, 03006, 86002
Prediction of Tyre Sidespray Ingestion in Take-Off and Landing
see
Aircraft Tyres
Rectangular External-Compression Double- or Single-Ramp
geometry for given design Mach number, 75005
Mach number along second ramp, 75005
mass flow, 75005
Nussdorfer criterion, 75005
optimum pressure recovery, 75005
pre-entry drag (wave drag), 75005
pressure recovery, 75005
sidespillage, 75005
stability considerations, 75005
Scoop Immersed in Boundary Layer With or Without Diverter
captured mass flow, drag and pressure recovery, 86002
Use of Liners to Attenuate Noise Transmission
see
Acoustic Absorption Coefficient
Acoustic Impedance
Integrally-machined Panels
see also
Flat Panels with Fibre-reinforced Unflanged Integral Stiffeners
Flat Panels with Flanged Integral Stiffeners
Flat Panels with T-section Integral Stiffeners
Flat Panels with Unflanged Integral Stiffeners
Considerations in Design Against Acoustic Fatigue, 86025
Damping Ratio Values
typical values, 91012
variation with frequency, 73011
Endurance Under Acoustic Loading, 72015
Integration
Numerical Techniques for Definite Integrals
see
Quadrature
Interaction
see also
Adjacent Circular Holes in Flat Plates
Interference
U-notches in Edge of Plate
Between Two Adjacent Stress Concentrations
effect of orientation in-line or transverse to load, 85045
method for estimating stresses in vicinity when transverse to load, 85045
Interfacial Tension
Interference
see also
Downwash
Interaction
Interference Fit
Interference Wave Drag
Aircraft Tyres in Multiple Wheel Configurations
see
Drag
Base Flow-Supersonic Propulsive Jet
see
Base Drag with Central Propulsive Jet
Between Topographical Features
see
Wind Speed
Deployed Leading-Edge High-Lift Devices and Trailing-Edge Flaps
see
Flaps
Discussion of Effect as Source of Buffeting, 87012
Effect on Shelter From Wind Provided by Several Parallel Fences
see
Boundary Walls and Fences
Fin-Afterbody (Cylindrical) at Supersonic Speeds
effect on base drag for fins mounted at or upstream of base, 97022
Fin-Tailplane
see
Lift-curve Slope
Sideforce Due To Sideslip (Yv or Cy β)
Flaps-Fuselage
effect on drag, lift and pitching moment, 97003
Flaps/Underwing Jet
effect of multi-slotted on drag, lift, pitching moment and thrust, 82034
Internal Flow
see
One-dimensional Flow
Pressure Drop in Internal Flow
Wind-tunnel Corrections for Aerofoils
Wind-tunnel Corrections for Bluff or Quasi-streamlined Bodies
Wind-tunnel Corrections for Wings
Jet (Underwing)/Multi-Slotted Flaps
effect on drag, lift, pitching moment and thrust, 82034
Nacelle-Empennage and Nacelle-Wing
see
Nacelle
Slipstream-Airframe
discussion of thrust/drag accounting, 85015, 85017
effects on airframe drag and propeller thrust, 85015, 85017
estimation of drag/thrust of propeller/body combination, 86017
lift on wing/flap/nacelle combination in slipstream, 88031
longitudinal force on wing/flap/nacelle combination in slipstream, 88031
Spoiler Wake-Fin
effect on yawing moment due to spoiler deflection for roll control, 96026
Two Circular Cylinders Normal to Flow
see
Profile Drag
Sideforce
Two Staggered Wings
see
Drag
Lift
Vectored-Jet-Thrust Aircraft
discussion of ground effect on pitching moment, 87037
discussion of jet-induced intake force and example of jet-induced lift loss in free air, 87037
example of variation of lift in ground effect, 87037
Wind or Other Fluid Flows About Structures Close Together
see
Boundary Walls and Fences
Normal Force
Profile Drag
Response of Buildings and Structures
Sideforce
Wing-Body
see
Wing-body Combination
Wing-Body-Tailplane Effect on Fin Derivatives Due to Sideslip
subsonic speeds, 00025, 82010, 93007
supersonic speeds, 91031
Wing-Body-Tailplane-Fin Effect on Ventral Fin Sideforce and Yawing Moment Due to Sideslip
subsonic and supersonic speeds, 92029
Wing-Foreplane
see
Drag
Lift
Wing-Nacelle
see
Nacelle
Wing-Tailplane
see
Drag
Lift
Lift-curve Slope
Wing-Undercarriage
see
Undercarriage Drag Estimation
Interference Drag
see
Interference Wave Drag
Jet Interference Drag, 16003
Interference Fit
see also
Clearance Fit
High-load Transfer Joints in Aluminium Alloys
Low-load Transfer Joints in Aluminium Alloys
Lugs (Fatigue Strength)
Medium-load Transfer Joints in Aluminium Alloys
Shafts with Interference-fit Collars
Bush in Finite Width Plate or Lug
interface pressure due to, 71011
maximum tensile stress due to, 71011
Effect on Behaviour Under Torsion of Key in Keyway, 86028
Effect on Fatigue Strength of Joints
calculation from fatigue data on other specimens, FAT A.05.02
Loaded Pin in Finite Width Plate or Lug
effect on alternating stresses, 84025
maximum shear stress, 66011, FAT A.05.02
Pin in Finite Width Plate
maximum tensile and shear stresses, 71011, 84025
Pin in Lug
maximum tensile and shear stresses, 71011, 84025
Two Pins Close Together in a Wide Plate
maximum tensile stresses, 71011
Interference Wave Drag
Bodies, AERO B.S.02.03.01
Forebody-Afterbody
conical, ducted conical and parabolic, AERO B.S.02.03.08
Internal Balance
see
Irving Internal Balance
Internal Flow
see
Pipes with Internal Flow
Cavity Aero-Acoustics
rectangular planform cavity in flat plate, 09001, 09002, 16004
Time-Averaged in Rectangular-Planform Cavity in Flat Plate
behaviour for a range of geometry and upstream boundary layer conditions, 02008
Unsteady in Rectangular-Planform Cavity in Flat Plate
behaviour for a range of geometry and upstream boundary layer conditions, 04023
Internal Pressure
see also
Cylinders of Circular Section (Strength and Vibration)
Cylinders of Circular Section with Flat Ends
Cylinders of Circular Section with Torispherical Ends
Cylinders of Elliptical Section
Pipe Bends (unrestrained)
Pipes with Internal Flow
Pressure Transients in Gas (and Steam) Internal Flow
Pressure Transients in Liquid Internal Flow
Circular-Section Cylinders Normal to Flow
top open, 81017
Rectangular- and Square-Section Cylinders Normal to Flow
effect of permeability, 71016
International Standard Atmosphere
see
Atmosphere
Equivalent Airspeed
Geopotential Altitude
Inter-rivet Buckling
Estimation of Buckling Stress, 90002, STRUCT 02.01.08
calculation for specific materials, STRUCT 02.01.09
effect of rivet type, STRUCT 02.01.08
example of application to panels, 72012
program for fabricated section struts, including inelastic behaviour, 90002
Intrinsic Momentum Drag
Turbo-Jet Engines
definition, 69006
Intrinsic Thrust
Turbo-Jet Engines
see also
Thrust of Turbo-fan and Turbo-jet Engines
definition, 69006
Inverse Nyquist Diagram
Explanation With Worked Example, 74021
Use in Control System Assessment and Design
advantages and disadvantages, 81008
flowchart, 81008
Irradiance
Solar
see
Solar Heating
Irving Internal Balance
Effect on Hinge Moment Derivatives With Incidence and Control Deflection, AERO C.04.01.04
I-sections
see also
Planar Shapes and Sections With/without Holes
Mean Forces Due to Wind or Other Fluid Flows
see
Profile Drag
Sideforce
Strength Analysis
see
Beams in General
Beams of Any Hollow or Solid Polygonal Section
Beams of I-section
Flat Panels in General
Struts in General
Struts of I-section
Welded Cover Plates on Steel I-beams
Welded Joints in Steels
Welded Longitudinal Joints in Steels Under Axial Loading
Welded Stiffening Gussets on Steel I-beams
Isentropic Flow
Compressible Single-Phase Flow Equations and Curves
see
One-dimensional Flow
Isothermal Flow
Compressible Single-Phase Flow Equations and Curves
see
One-dimensional Flow
Izod Values
Steels
at room temperature 00932 (MMDH)

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