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Questions and Answers
What is the primary benefit of anodising aluminium alloy blades in propellers?
What is a key characteristic of steel propellers that makes them susceptible to issues without treatment?
Which process specifically distributes stresses evenly in the surface of metal propellers?
Which type of materials are typically employed in shot peening processes?
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Which characteristic is NOT a result of anodising aluminium alloy propeller blades?
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What is the purpose of using a go-no-go gauge during the inspection of the wear?
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Why is Prussian blue used on cone and hub faces?
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What material is the rear cone for center hub placement made of?
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What is the role of the removable bushing in a taper bore application?
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What is typically checked during general propeller installation?
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In the context of propellers, what does composite material typically refer to?
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Which method can be used to enhance the durability of metal propeller surfaces?
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What is the purpose of using tapered cones during installation?
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What primary purpose does shot peening serve in metal propeller construction?
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Which composite material is NOT mentioned as being used in the construction of propeller blades?
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In which of the following methods is a foam core placed to resist distortion in composite propellers?
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What is the role of the polyurethane foam filling in Fibre-Reinforced Plastic (FRP) moulding?
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Which of the following statements about fibre-reinforced plastic (FRP) blades is true?
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What is a common characteristic of the materials used in constructing composite propellers?
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Which feature is crucial in the retention of composite materials on the shank of a propeller?
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What is a significant advantage of using composite materials in propeller construction?
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Study Notes
Fixed Pitch Metal Propellers
- Aluminum alloy propellers are strong and malleable, extending to the propeller hub
- Anodizing creates a hard coating on aluminum blades which is corrosion resistant, waterproof, and airtight.
- Shot peening is a surface treatment that distributes stress and increases fatigue strength, especially for steel propellers which are brittle.
- Shot peening is done by blasting small beads of steel or glass onto the surface of the propeller.
Composite Propellers
- Blades can be constructed with fiberglass, Kevlar, carbon, or boron fibers.
- One method of constructing composite blades involves wrapping these fibers around an aluminum-alloy spar with foam in the leading and trailing edges.
- The second method uses a composite shell with a foam core.
- Fibre-reinforced plastic (FRP) blades consist of a laminated Kevlar shell with a foam core.
- Kevlar is layered in multiple directions to boost the strength of the shell.
- The leading and trailing edges are reinforced with solid Kevlar to resist flexing and buckling.
Propeller Installation
- Tapered cones are used on the front and back of the hub to center it on the prop shaft.
- Prussian blue is used to check the degree of mating between the cones and hub after the prop-retaining nut has been tightened.
- A protective cap should be fitted to the prop shaft threads to prevent damage during installation.
- In variable-pitch propellers, a removable bushing is fitted into the blade butt to provide a bearing surface for the blades.
- This bushing also allows for the fitment of a plug that balances the blades statically.
Propeller Construction
- The spider forging is the main component that connects the blades to the propeller hub.
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Description
Test your knowledge on fixed pitch metal and composite propellers. This quiz covers materials, construction methods, and surface treatments used in propeller design. Explore how aluminum alloys and advanced composites like Kevlar and carbon fibers enhance performance.