Fabrics Flashcards
What fabrics used in aircraft
Unbleached Linen or cotton fabric
What is cotton used for
To prevent chatting between fabric and the structure
Serrated pinked edge
String
Wax or nylon cord
How should fabrics be stored
20 degrees
Dry and clean
Preparation of fabrics
Sharp edges , bolts covered
Protection layer added
What is the relationship between warps and wefts
More warps than wefts
Covering material
Prefabricated envelops
Blanket method
What is a bollon Seam
French fell
the seam, the edges of the fabric are folded back and are then fitted into each other, tacked together and then machine sewn
What is a lap seam
Only used when specified by the manufacture
Hand sewing
Three stitches per cm
Lock stitch per 50 cm
Overhand stitch
Sudden change of section occurs
Beeswax
Used when not pre waxed
Prevents damage to hole and to assist sewing
Flaxing
Single cord used unless started other wise
What is boom stringing
Used on deep aerofoil passed around boom instead of typical stringing
Slip stream area , diameter of a prop plus one rib of a multi engine
diameter of a prop plus one rib of a multi engine
Prefabricated envelops
The envelopes are made loose enough to facilitate slipping them over the structure and to achieve the proper tautness after doping.
Blanket
length of fabric is used and covers are made-up on the site. Lengths of fabric, or a number of lengths joined side-by-side, being used to cover the aircraft structure.
Seams
The seams in the fabric covering should be either parallel to the fore-and-aft line of the aircraft or on a bias, depending on the covering method used
Attachment of fabric to plywood
Dope
Smoother with fine glass a paper
Wood treated with one coat of tautens he dope and another
Fabric stretched over wood
Attachment of Fabric to Metal Surfaces
the fabric is generally doped into position. Alternatively, a thermoplastic adhesive may be used and guidance on the use of this material may be obtained from the relevant aircraft manuals.
Drainage holes
usually positioned in the lower surface of components or wherever entrapment of moisture is possible, but when holes are used for ventilating purposes
Drainage eyelets
Drainage eyelets (grommets) are usually oval or circular in shape and are doped onto the surface of the fabric
Maule tester
Spring loaded with a blunt point
Pushed down on the fabric until the point found in book
Fabric penatrated has failed test
What does aluminium dope do
Makes fabric uv protected
