Engineering design handbook helicopter engineering part 1




















Reliability Substantiation During Design Assessment of Design Criteria D esign Reviews Design Support Tests Reliability Substantiation During Test Substantiation Testing Substantiation Testing Process Reliability M odel M odularization Standard Versus Nonstandard Parts Policy Factors Rotor Clearance Engine Installation Interior Arrangement..

Personnel Emergency Egress Fuel Storage Aerodynamic Requirements Turnover A ngle Step H eight Weapon Clearance Rear Ram p O ther Restraints Preparation for Shipment Tiedown and Lifting Points Aircraft Size and Weight Limitations Terminal Facilities Cargo Vehicles Size and Weight Limitations Van Loading Body D imensions M uscular Strength G lare Light Transmission, Reflection, and Fogging Adverse Visual Effects Optimal Visual Areas System A nalysis Flow Charting Function A nalysis Operational Sequence Diagramming General Control Principles V ibration Emergency Egress Emergency Environments Human Factors Engineering Considerations Emergency Egress Preliminary Design Acoustical Noise Level and Suppression Acoustical Concepts H earing Loss Noise Exposure DOD Noise Limits Control of Noise at Source Environmental Considerations Therm al Stress Environmental Control System Heating Requirements Cooling Requirements Ventilation Requirements Thermal Analysis Atmospheric Contaminants Oxygen Requirements Configuration Composition and Optimization Contribution of Operational Factors to Mission Effectiveness Illustration of System Complexity Reliability as a Function of Complexity Trends in Helicopter Cruise Speeds Trend of Structural Weights for Helicopters Representative Mission Profile, Heavy-lift Helicopter Cost and Effectiveness for Various Designs Typical Curvilinear CER Typical Mean Drag and Lift Coefficients Disk Loading vs Power Loading Moments and Forces of a Hovering Rotor Vortex Pattern Beneath Hovering Rotor V ortex Pattern Maximum Figure of Merit V ertical D rag Formats for Total Efticiency W ald's Equation Effect of Reversed Flow Basic Flow Chart for Numerical Method Typical Charts for Estimating Performance Velocity Components Projected Disk Area, Overlapping Rotors Tandem-rotor Interference Factors Retreating Tip Angle of Attack Installation of Electrically Powered Model Installation of Hydraulically Powered Model Typical Resuhs for Model W ithout Rotor Arrangement of Download Facility Engine Weight vs Shaft Horsepower Gas Turbine Engine Cycle Generalized Helicopter Turboshaft Engines Plan View of Rotor in Flight Schematic of Two-bladed Semirigid Rotor Photograph of Two-bladed Semirigid Rotor Floating Hub Rotor M odern Hingeless Rotor Tilt of Rotor Thrust Vector Rotation of Blade Increment, Plan View Rotation of Blade Increment, Rear View Effect of Activity Factor on Thrust Coefficient Comparison of Performance for Turboprop and Turbofan Engines M ission-specified Constraint Altitude Dependence of Turbine Engine Power Temperature Dependence of Turbine Engine Power Gas Turbine Specific Fuel Consumption Induced Power Correction Tandem-rotor Geometry Hover Power Loading at Altitude Sea Level Power Loading Rotor Figure of M erit Maximum Rotor Figure of Merit Climb Power Determination Fuel Required in Forward Flight Available Fuel W eight Ratio Configuration Selection M ain Rotor Radius Cost-effectiveness Optimizatio i Typical M ission Profile H over Ceiling Hover Ceiling Calculation Procedure Aircraft Hover Power Development Hover Fuel Calculation Helicopter Speed Capability Payload-range Calculation Chart Specific Range Performance Payload-range Capability Optimum Specific Range Performance Elements Required for Specific Range Computation Range Index Method Effect of Wind on Range Capability Ferry Range M ission Generalized Range Parameter Generalized Helicopter Performance Elements Required To Compute Endurance Level Flight Power Required Clim b Capability Forward Climb Capability-Graphical Format Minimum Level Flight Power Required Maximum Forward Rate of Climb Determination Service and Combat Ceiling Capability Ceiling Capability Calculation Vertical Climb Performance Determination of Vertical Climb Capability Takeoff Profile Height-velocity Profile Power Requirements for Takeoft Landing Profile Development of Takeoff Level Acceleration Capability Takeoff Performance - Acceleration Phase Development of Takeoff Performance Climb Capability Takeoff Performance - Climb Phase Development of Approach Rate of Descent Landing Performance - Approach Phase Determination of Landing Deceleration Capability Landing Performance - Deceleration Phase Typical Altitude-speed Limits.

Relationship Between True and Equivalent Airspeed Typical Altitude-velocity Diagram Typical Structural Altitude-speed Constraints Typical Vibration Characteristics Fuselage Pitch A ttitude Basic M echanism of Autorotation Nondimensional Velhcities in Vertical Autorotation..

Forces on Helicopter in Autorotation. Rate of Des. Maximum Rotor Capability Idealized Flare M aneuver Conditions for Autorotation at End of Cyclic Flare C ritical Velocity Height-velocity Curve for UH-l Height-velocity Curve for CHB Typical Rotor Thrust Capability.. Analytical Aerodynamic Maximum Thrust Specific Fuel Consumpticn vs Engine Power Maximum Range Management Variables Flight Path Profiles for Takeoff Procedures Continued Flight and Rejected Takeoff Diagram Balked Landing and Landing Diagram Escort M ission Profile Reconnaissance Mission Profile Frequency of Occurrence of Load Factors Derived Gust Velocity Encounter Distribution Level Flight Forces Pullup Maneuver Typical Maneuver-Time Spectrum Landing Attitudes, Tricycle Gear Landing Attitudes, Skid Gear Landing Attitudes, Tail Wheel Gear Landing Attitudes, Quadricycle Gear Most Common Asymmetrical Landing Attitudes Asymmetrical Attitudes, Tricycle Gear Asymmetrical Attitudes, Skid Gear Asymmetrical Attitudes, Tail Wheel Gear Asymmetrical Attitudes, Quadricycle Gear Typical Impact Pulse tfr Helicopters Braked Roll, Two-point Braked Roll.

Idle Powers for a Typical Free-turbine Engine Drag Limits for Helicopter Fittings Effect of Blade Twist on Loading Distribution Rotor Plan View Looking Down Angle-of-attack Distribution at High Forward Speed Modal Representation of Blade Displacements Elem ents in Analysis Typical Blade Cross-sectional Loading Representative Blade Structure Determination of Constant K,.

Planetary System Load Diagram Loading Diagram for y-Direction Rotor Pitch Change Typical Bungee Capsule Fig, Fig. Fig Fig. Pitch Link Load Waveform Block Diagram, Control Load Determination Alternating Pitch Link Load vs Airspeed Spring Mass System Typical Steady-state Maneuvers Typical Transient Maneuvers Load Factor vs Bank Angle Typical Tail Boom Weight Distribution Unit Loading for Tail Boom Typical Fuselage Shear and Moment Curves Rotor Vibratory Loads Transmitted to Structure Effects of Dynamic Load Factor Increment Dynamic Increment Definition Ram p Force Excitation Typical Spanwise and Chordwise Lift Distribution Typical Ordnance Blast Pressure Allowable Shear Buckling Shearflow Schematic Beam-rib Structure Schematic of Spring Substitution for Skid Gear Goodman Diagram Typical S-N Curve Example S-N Curve Ground-air-ground Cycles Analytical Demonstration of Infinite Fatigue Life Three Types of Vibration Simple Harmonic Motion Time History of an Element of f, and y, in Steady State Complex Representation of Condition of Fig.

Relative Modal Amplitude vs Forcing Frequency Mathematical Model of an Isolation System Normalized Response for a Typical Isolation System Southwell Diagram Phase Relations of Blades n - 1 , 0, 1 in Regressing Mode Phase Relations of Blades n - 1 , 0, 1 in Advancing Mode Boundary from Advancing Tip Mach No.

Frozen Azimuth Flapping Instability Boundary Automatic Hover -. Automatic Stationkeeping -. Passive Failures - i. Life-load Relationship -.

Suggestions for Good Design Practice of Gearboxes -. Gearbox Lubrication Considerations -. Accessory Bearings -. Transmission Main Drive Train -. Integral Type -. Separate Type - Installation Considerations -. Lubrication -. Splash Lubrication System -. Circulating Lubrication Systems -. Preliminary Gear and Bearing Loss Predictions -.

Inertial Separators - S. Vortex Tube Inettial Separators -. Centriftipl Inertial Separator -. Compressed Air Power - t. Self-sufficiency - S. Ground Support Functions - S. Flight or Alternate Support Functions - S. Weight Optimization -. Electrical Energy Transfer -?.. Hydraulic Energy Transfer - S.

Pneumatic Energy Transfer - S. Direct Drive Energy Transfer - S. Combination Energy Transfer -. Space Opti. Fixed Weight Penalty -. Variable Weight Penalty -. Ram Air Drag Penalty -. Bleed Air Penalty -. Constant-speed Drive System -. Air Turbine System -. Controlled-speed Hydraulic Motor System -. Cycloconverter System -. System Pressure Trade-offs -. Accumulators - I. System Pressure Relief Valves - f.

Filters - I. Statie and Dynamic Seals - I. Fittings -. Tubing -. Hose Assemblies -. Detail Design Item Preview. EMBED for wordpress. Want more? Advanced embedding details, examples, and help! The preliminary design covered in AMCP is developed during the proposal phase, at which time all subsystems must be defined in sufficient detail to determine aircraft configuration, weight, and performance.

Along with AMCP , Preliminary Design, and AMCP, Detail Design, this part is intended to set forth explicit design standards for Army helicopters, to establish qualification requirements, and to provide technical guidance to helicopter designers in both the industry and within the Army.

This volume defines the requirements for airworthiness qualification of the helicopter and for demonstration of contract compliance, and also describes the test procedures accomplished by the Army. Also, the customer organizations become larger, more efficient, demand more reliability and accuracy, and in general, refine their capability in all areas.

The manufacturers and government in turn are forced to provide more comprehensive and accurate information about the product, thus requiring an ever increasing flight test effort. This handbook discusses flight testing as it relates to helicopter performance determinations.



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