6.10 Flashcards by Oisin Tyrrell

Q

Strand

A

Made of wires twisted together

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Q

Cable

A

Made of strands twisted together

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Q

What forces to Cables and Pulleys transmit

A

Tension and Pulling

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Q

What device is used to keep tension in a Single cable system

A

Spring Loaded Device

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Q

What is Preforming

A

Bending of strands to there position in a cable

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Q

What metals are Cables made from

A

Galvanised Carbon Steel

Stainless Steel

CRS

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Q

What kind of forces (stresses) act on a cable

A

Tension Stress and Bending

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Q

What is Tensile Strength of a Cable Dependent on

A

Size

Material

Construction

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Q

Explain Cables looses strength due to bending

A

The inability for strands and wires to adjust themselves when the cable is bent

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Q

Explain Fatigue sue to bending in Cables

A

Small cracks form under bending loads

Eventually causes Fatigue failure

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Q

Wear of a Cable is determined by

A

Outer Wire Size

Composition

Construction

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Q

Larger Outer wires have

A

More wear resistance

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Q

Misaligned Pulleys will cause an increase in

A

Cable Wear

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Q

What effect will stretching of a cable have on output

A

Produce an Uneven Delayed and Reduced Output

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Q

Structural Stretch

A

Core Compression

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Q

Elastic Strecth

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A

Elongation of Wires

Q

Elastic Limit of Stainless Steel Cable

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A

60% of Breaking Force

Q

Elastic Limit of Galvanised Steel Cable

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A

50% of Breaking Force

Q

How many strands 7 x 19

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A

7

Q

How many wires in a 7 x 19

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A

19 wires

Q

Smaller Wires means

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A

More Flex

Q

LockClad Cables

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A

Twisted Steel wire with Aluminium tube around it

Same coefficient of expansion as fuselage

Q

What do turnbuckles do

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A

Adjust Cable Tension and Length

Q

Turnbuckle LH thread indications

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A

Knurl or Grove

How are Turnbuckles locked

Spring Clips Lockwire

What conditions can alter the tension of a cable

Temp Flexing of aircraft

Tension Regulator Purpose

Keep Tension in Tolerances

Broken Cable Compensator Purpose

Protect against Broken Cables

Fair leads Purpose

Prevent Chaffing when routing through Aircraft Structure

Max Deflection of a Cable in Fairlead

3 °

Quadrants and Drums

Input or Output of Cable Systems

Bowden Cables

Transmit force via inner cable in hollow housing

Lengthening Housing of Bowden Cables

Tightens Cable

Shortening Housing of Bowden Cable

Loosens Cable