Podcast
Questions and Answers
What material is used to protect the leading edge of rotor blades from erosion?
What material is used to protect the leading edge of rotor blades from erosion?
Why are the bottom of rotor blades painted flat black?
Why are the bottom of rotor blades painted flat black?
Which type of rotor blade is required to have static discharge abilities?
Which type of rotor blade is required to have static discharge abilities?
What is the primary inspection method used for composite rotor blades?
What is the primary inspection method used for composite rotor blades?
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Where are spanwise balance weights located on a rotor blade?
Where are spanwise balance weights located on a rotor blade?
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What effect does adding weight to the trailing edge of a rotor blade have?
What effect does adding weight to the trailing edge of a rotor blade have?
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What is the purpose of trim tabs on a rotor blade?
What is the purpose of trim tabs on a rotor blade?
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What should be done before rigging a helicopter?
What should be done before rigging a helicopter?
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Which blade design has higher camber on one side than the other?
Which blade design has higher camber on one side than the other?
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What planform produces more equal lift due to accounting for speed variation?
What planform produces more equal lift due to accounting for speed variation?
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Why are symmetrical blades considered the most common design?
Why are symmetrical blades considered the most common design?
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What happens to parallel blades as a result of having a negative twist?
What happens to parallel blades as a result of having a negative twist?
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What is a reason for using bonded construction in blade manufacturing?
What is a reason for using bonded construction in blade manufacturing?
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Which skin configuration is quicker to build?
Which skin configuration is quicker to build?
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What would happen if the single pocket skin configuration is damaged?
What would happen if the single pocket skin configuration is damaged?
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What is a characteristic of tapered blades in terms of rib configuration?
What is a characteristic of tapered blades in terms of rib configuration?
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What must be ensured before connecting the collective and throttle together?
What must be ensured before connecting the collective and throttle together?
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What is the first step in the testing process for the helicopter after rigging is complete?
What is the first step in the testing process for the helicopter after rigging is complete?
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What advantage does the main servo flap provide?
What advantage does the main servo flap provide?
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In what order should the flight controls be rigged?
In what order should the flight controls be rigged?
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Which device is more complex, the droop compensator or the correlator?
Which device is more complex, the droop compensator or the correlator?
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Which vibration absorbing device consists of weighted drum supported by three springs?
Which vibration absorbing device consists of weighted drum supported by three springs?
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What role does the elevator play in a helicopter?
What role does the elevator play in a helicopter?
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If a helicopter has a fixed elevator, what type of airfoil will it have?
If a helicopter has a fixed elevator, what type of airfoil will it have?
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Study Notes
Rotor Blade Design
- Two main designs: symmetrical and asymmetrical
- Symmetrical blades have better aerodynamic pitch characteristics
- Asymmetrical blades generate greater lift over the same surface area, with higher camber on one side.
- Asymmetrical blades are modified to have the same pitching characteristics as symmetrical blades (e.g. sweeping edges).
- Symmetrical blades are the most common design because of asymmetrical blade instability.
- Two types of blade planforms are uniform (parallel leading and trailing edges) and tapered (converging leading and trailing edges).
- Uniform blades generate greater lift due to chordline.
- Tapered blades have changing rib numbers due to varying chord lengths.
- Tapered blades produce more even lift across the blade due to speed variations.
Helicopter Skin Configurations
- Single pocket skin is quicker to build due to fewer pieces, but more difficult to repair.
- Multi pocket skin is easier to repair as individual damaged sections can be replaced.
- Multi-pocket skins are more expensive to build.
Bonded Construction
- Bonded construction is used because it's stronger and doesn't require drilling holes.
Rotor Blade Trim Tabs
- Trim tabs can be used to adjust the altitude of the blade.
- Moving weight forward on the trim tab lowers it in rotation.
- Moving weight backward on the trim tab raises it in rotation.
Rotor Blade Vibration
- Bifilar vibration absorbers use weights on the arms of a device
- Hub vibration absorbers use a weighted drum supported by springs.
Flight Controls
- Collective is rigged first.
- Throttle and collective are connected through a device called a correlator
- Drivetrain elements and hydraulic components of a helicopter are rigged individually before correlator connection.
Servo Flap
- Servo flaps located on the trailing edge of each blade.
- Improves autorotation and reduces forces needed for pitch or altitude change.
Other important factors
- Cyclic movement is adjusted to maintain a level attitude.
- Overspeed is dangerous, as it can cause unwanted centrifugal force in the helicopter.
- Mass balance weights are placed on the leading and trailing edge of the blades.
- Mass balance weights in chord-wise direction balance the weight across the rotor.
- The leading edge of each rotor blade contains a tracking weight.
- Span-wise weights are situated on the central section of rotor blades.
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Description
Explore the intricacies of rotor blade design, focusing on symmetrical and asymmetrical configurations, as well as their aerodynamic characteristics. The quiz also delves into the differences between single pocket and multi pocket skin configurations for helicopters, detailing their advantages and disadvantages.
