Wood (Week 4) 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 Veneers 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
tangential direction (parallel to growth rings)
what are the types of wood construction?
- solid wood
- laminated wood
- plywood
what is the minimum number of annular ring per inch?
6
2 or more layers of solid wood bonded togerther is called what?
Laminated wood
Constructed by bonding thin sheets of wood together called veneers
Plywood
This is the useable life of the glue from the time it is mixed until the time it must be used.
Pot life
the allowable time between the application of the glue and the time the joint is assembled. (once you put the glue one)
open assembly time
the allowable length of time between assembly of the joint and the application of clamping pressure.
closed assembly time
the period of time during which the parts are being pressed together.
pressing time
Ideal moisture content of wood
10-12%
For fungus to grow, the moisture content would normally have to be greater than?
20%
Acceptable Moisture is ___ - ___ %
8-16
