wood 4

Pressure is to be used to squeeze the glue out into a continuous film between wood layers and to force air from the joints; the amount of pressure for soft woods is:

125 to 150 pounds.

The length of the nails used in aircraft structures should be such that they penetrate the wood below the joint at least

3/8 inch.

To ensure reliability of a glue joint, what procedure should be used?

A small sample of glue should be mixed and applied to a similar wood joint and tested before the production repair is made.

Why is clear varnish used when finishing a structural wood surface?

The transparent coat permits visual inspection.

Which of the following structure types carry all of the stress loads through an internal structure.

Truss

Wood joints to be glued should:

be planed smooth and straight.

(1) Sandpaper should not be used to smooth softwoods prior to bonding. (2) Wood surfaces ready for bonding must be free from oil, wax, varnish and dust. Regarding these statements

both #1 and #2 are true.

The I beam wooden spar is routed to

reduce weight.

How are bracing wires attached to wood structures?

through the use of specialized fittings.

Pot life is a term that best describes:

usable life of adhesive from the time it is mixed.

Milk based glue considered inferior to modern glues.

Caesin

Time period between pressing two wood pieces with adhesive applied together and application of clamping force is:

Closed assembly time

Final finishing of a glue joint prior to applying glue should be done with 120 grit sand paper.

False

Glue which rapidly deteriorates when exposed to hot, moist environments or cyclic stress.

Plastic resin

The aerodynamic shape of the wing is defined by:

Ribs

Which of the following structure types depends upon a combination of internal structural members connected together with load bearing outer skins to transmit flight stresses?

Semi-monocoque

What kind of glue is recommended for making a repair to a wooden aircraft structure?

Synthetic resin glue

In general, the effect of temperature on proper adhesive curing is

critical for a proper glue joint.

The strongest wood joint is obtained by the use of:

glue only.

The strength of a well designed and properly prepared wood splice joint is provided by the

glue.