Wood Flashcards
The reference species as a standard of tree wood is _______ _______
Sitka Spruce
Aircraft wood must be _____ dried
Kiln
The wood’s Specific Gravity must be Greater than ______
0.36
The slope of the grain must not be steeper than __ in ___
1 in 15
Must be ________ ___________ (Vertical Grain)
Quarter Sawed
What kind of cut is this?
Quarter Sawed
Grains of Laminated wood must run __________ to eachother
Parallel
The best kind of wood for Spars is __________ wood
Laminated
___________ is constructed from veneors that are hot bonded together
Plywood
Grains of Veneors on Plywood run at ____ degree angles to eachother
90
Wet Wood is susceptable to ______, this usually occurs at 20% moisture and up
Fungi
Splits often occur ________ ______ _________
along grain lines
Wood shrinkage is greatest in a ____________ direction
Longitudinal
______ __________ is usually due to improper fabrication/prolonged exposure to moisture
Bond failure
Acceptable Moisture is ___ - ___ %
8-16%
Ideal Moisture is ____-____%
10-12
Drain Holes size:
1/4”
Most common, FAA approved 2-part synthetic
Resorcinol Glue
Modern repair adhesives
Epoxy Resins
Usable life of the glue from time it is mixed until time is used is called ____ _______
Pot Life
Time between application of glue, until closing joint
Open Assembly time
Time between closing and applying pressure
Closed Assembly Time
Time during which the parts being pressed together
Pressing time
______ ________ is the most satisfactory way of making an end joint between 2 solid wood members
Scarf Joints
