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Questions and Answers
Which rotor blade design has a superior aerodynamic pitch characteristic?
Which rotor blade design has a superior aerodynamic pitch characteristic?
Which blade design is characterized by a higher camber on one side compared to the other?
Which blade design is characterized by a higher camber on one side compared to the other?
How do engineers achieve a similar pitching characteristic with an asymmetrical blade design?
How do engineers achieve a similar pitching characteristic with an asymmetrical blade design?
What is the primary reason symmetrical rotor blades are more commonly used?
What is the primary reason symmetrical rotor blades are more commonly used?
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Which planform features leading and trailing edges that run parallel to each other?
Which planform features leading and trailing edges that run parallel to each other?
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Why do manufacturers prefer the uniform planform for rotor blade production?
Why do manufacturers prefer the uniform planform for rotor blade production?
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Which skin configuration is considered easier to repair?
Which skin configuration is considered easier to repair?
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When can the chord line mass balance weight on a rotor blade be moved?
When can the chord line mass balance weight on a rotor blade be moved?
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What is the primary reason for painting the bottom of rotor blades flat black?
What is the primary reason for painting the bottom of rotor blades flat black?
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Which material is NOT typically used in the construction of rotor blades?
Which material is NOT typically used in the construction of rotor blades?
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What is the most common method used for inspecting composite rotor blades?
What is the most common method used for inspecting composite rotor blades?
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What is the effect of adding weight to the leading edge of a rotor blade?
What is the effect of adding weight to the leading edge of a rotor blade?
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What is the purpose of stainless steel capping on the leading edges of rotor blades?
What is the purpose of stainless steel capping on the leading edges of rotor blades?
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What type of rotor blades are required to have static discharge capability?
What type of rotor blades are required to have static discharge capability?
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Where are chordwise mass balance weights typically located on a rotor blade?
Where are chordwise mass balance weights typically located on a rotor blade?
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Which component is rigged first on a helicopter?
Which component is rigged first on a helicopter?
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What action is required before connecting the collective and throttle?
What action is required before connecting the collective and throttle?
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In what order are the flight controls rigged?
In what order are the flight controls rigged?
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What is the primary function of the main servo flap?
What is the primary function of the main servo flap?
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Which system is considered more complex?
Which system is considered more complex?
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What type of airfoil is a fixed elevator on a helicopter?
What type of airfoil is a fixed elevator on a helicopter?
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Which vibration absorbing device uses a weighted drum supported by three springs?
Which vibration absorbing device uses a weighted drum supported by three springs?
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What does the correlator do?
What does the correlator do?
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How many gradient actuators are present if all flight control systems have force trim?
How many gradient actuators are present if all flight control systems have force trim?
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Study Notes
Rotor Blade Design
- Two main designs: symmetrical and asymmetrical
- Symmetrical blades have better aerodynamic pitch characteristics
- Asymmetrical blades provide greater lift for the same surface area, with higher camber on one side
- Engineers use sweeping edges on asymmetrical blades to achieve symmetrical pitching characteristics
- Symmetrical blades are the most common design due to the asymmetrical design's instability
- Two main planform types: parallel (uniform) and tapered
- Uniform planform has parallel leading and trailing edges
- Uniform planform creates greater lift due to its chord line
- Tapered planform has converging leading and trailing edges with decreasing chord length towards the root
- Manufacturers prefer uniform planforms for cost-effectiveness, using one machine stamping for ribs and only one rib part number.
- Tapered planforms need different rib numbers due to varying chord length
- Tapered blades provide more equal lift, accounting for speed variations
- Parallel blades have negative twist for maintaining the same lift at different rotor blade speeds.
Helicopter Skin Configurations
- Single pocket: Quicker to build, but harder to repair if damaged.
- Multi pocket: Easier to repair, but more expensive to build.
Helicopter Construction
- Bonded construction is stronger and eliminates drilling holes
- Multi-pocket skin configuration is easier to repair than single-pocket
Rotor Blade Weights and Balance
- Weight added to the leading edge lowers the helicopter in its plane of rotation.
- Weight added to the trailing edge raises the helicopter in its plane of rotation.
Trim Tabs
- Trim tabs adjust the rotor blades to fly higher or lower in their plane of rotation.
- Trim tab position is adjusted to alter the aerodynamic effect of airflow, for achieving correct pitch changes.
Rotor Blade Material and Color
- Metal, composite, and wood are common materials for rotor blades.
- Rotor blade bottoms are painted flat black to reduce glare for the pilot.
Rigging Procedures
- Rigging occurs before further procedures and ensures removal of all residual hydraulic force.
- Collective is rigged first on a helicopter for all stages of preparation.
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Description
This quiz covers the essential aspects of rotor blade design, focusing on symmetrical and asymmetrical configurations. It also explores planform types, highlighting the advantages and disadvantages of uniform and tapered designs. Understand the aerodynamic implications and manufacturing preferences in rotor blade engineering.
