6.3.3- Fabric Flashcards
What are the most suitable conditions for the application of fabric?
Room temperature of 16°C to 21°C and relative humidity of no more than 70%.
What is the weft of a fabric?
The threads running the width of the fabric.
What is cotton tape often referred to as?
Egyptian tape.
For stringing of fabric what is normally used?
Flax cord.
How should fabrics be stored?
20°C in dry, clean conditions away from direct sunlight.
How do you stop any dope from reacting with the protective treatments?
Adhesive cellulose or aluminium tape, or painted with dope resistant white paint.
What angle can the warp or weft of a fabric be fitted to the slip stream?
45° or in line.
What are the two methods of fabric covering an airframe?
Prefab Envelopes
Blanket.
How does the envelope method of fabric covering work?
Made from the patterns for the various surfaces and are loose enough to slip them over the structure but still achieve the required tautness when doped.
How does the blanket method of fabric covering work?
Lengths of fabric are joined side by side.
What are the two types of seams?
Balloon
Lap.
What is the balloon seam sometimes referred to as?
French fell.
What is a balloon seam?
The edges of the fabric are folded back and then fitted to into each other and then sewn. (Page 182 of notes).
What stitches are used for repair? And what are the two less commonly used?
Herring bone (baseball) and boot stitch. Overhand and lock.
Why do you put beeswax on threads?
To protect them from friction, fraying and damage to the eyelets.
Where is boom stringing used?
Used on deep aerofoil sections, the cord goes around the rib boom instead of the entire rib.
What are the most common methods of fabric attachment?
Strip
Stringing
Adhesives
What is strip attachment of fabrics?
Wrapping it around a rod and then securing in a channel or groove.
How is fabric attached to plywood?
Dope, it should be rubbed down after it has dried with wet and dry.
What methods of drainage and ventilation are there?
Drainage holes
Drainage eyelets
Shielded eyelets
How can the ability to inspect the structure be incorporated into fabric covering?
Woods frames
Zip panels
Spring panels
What is the major disadvantage of woods inspection frames?
A new patch must be doped on each time.
What can be repaired using a darning?
Irregular holes or jagged tears, provided it’s not bigger than 50mm at any point. Stitches should follow the line of the warp and weft.
What dimensions are fabric insertions used for fabric repairs?
For damage over 100mm square.
Name the two methods used to test fabric?
Seyboth and maule.
Describe the principles of using a maule tester.
Spring loaded instrument with a blunt point. Breaking point of fabric is reached on the scale, if fabric is punctured it fails.
Describe the principles of a seyboth tester?
The force it takes to pierce the fabric is measured on a coloured scale, all punctures must be repaired.
What does doping achieve?
Tautening
Waterproofing
Airproofing
Light proofing
What dope is used to protect from UV?
Aluminium Dope.
