Fill in the Blanks
1. Sitka Spruce
2. quarter, shrinkage
3. 1 to 15
4. Mahogany
5. rot-inhibiting
6. varnish
7. 1/10th
8. 5:1
9. Aramid
10. high stress, vibration
11. selvage
12. bias
13. uni -directional
14. mats
15. resin, catalyst, catalyst
True or False
1. true
2. false
3. false
4. true
5. true
6. false
7. true
Knowledge Application
1. The same type of plywood as originally used.
2. Knots, checks, splits, pitch pockets, cross grain, curly grain, decay; dry rot, etc.
3. Resorcinol glue, Phenol-formaldehyde glue, and epoxy resin glue.
4. To allow the moisture content to equalize, thereby minimizing dimensional changes in the wood.
5. If the maximum open-assembly time is exceeded, the joint may fail since the glue may begin setting up before the joint is assembled.
6. Clamping forces air out of the joint, brings the wood surfaces together evenly and is, in part, responsible for the strength of the glue line.
7. 70 degrees Fahrenheit or as specified by the glue manufacturer.
Multiple Choices
1. c
Solid spruce spars may be replaced with laminated ones or vice versa, provided the material is of the same high quality.
2. b
When a wood splice is made, the bond between the two pieces of wood consists only of a layer of glue. How strong the joint will be depends on how well the gluing operation was performed.
3. c
The species used to repair a part should be the same as that of the original whenever possible.
4. b
In cases of elongated boltholes in a spar, or cracks in the vicinity of boltholes, a new spar section should be spliced in, or the spar should be replaced.
5. a
Compression failures are characterized by a buckling of the fibers that appear as streaks on the surface of the piece, substantially at right angles to the grain.
6. c
Decay. All pieces must be free from rot, dote, red heart, purple heart, and all other forms of decay.
7. b
Mineral streaks are not acceptable in wood if they are accompanied by any decay.
8. a
I-beam spars are externally routed on both sides to reduce weight while retaining adequate strength.
9. b
Pin knot clusters. Small clusters are acceptable, provided they produce only a small effect on grain direction.
10. b
A cantilever wing is one that uses no external bracing.
OTHER QUESTIONS
1. Sitka Spruce
2. quarter, shrinkage
3. 1 to 15
4. Mahogany
5. rot-inhibiting
6. varnish
7. 1/10th
8. 5:1
9. Aramid
10. high stress, vibration
11. selvage
12. bias
13. uni -directional
14. mats
15. resin, catalyst, catalyst
True or False
1. true
2. false
3. false
4. true
5. true
6. false
7. true
Knowledge Application
1. The same type of plywood as originally used.
2. Knots, checks, splits, pitch pockets, cross grain, curly grain, decay; dry rot, etc.
3. Resorcinol glue, Phenol-formaldehyde glue, and epoxy resin glue.
4. To allow the moisture content to equalize, thereby minimizing dimensional changes in the wood.
5. If the maximum open-assembly time is exceeded, the joint may fail since the glue may begin setting up before the joint is assembled.
6. Clamping forces air out of the joint, brings the wood surfaces together evenly and is, in part, responsible for the strength of the glue line.
7. 70 degrees Fahrenheit or as specified by the glue manufacturer.
Multiple Choices
1. c
Solid spruce spars may be replaced with laminated ones or vice versa, provided the material is of the same high quality.
2. b
When a wood splice is made, the bond between the two pieces of wood consists only of a layer of glue. How strong the joint will be depends on how well the gluing operation was performed.
3. c
The species used to repair a part should be the same as that of the original whenever possible.
4. b
In cases of elongated boltholes in a spar, or cracks in the vicinity of boltholes, a new spar section should be spliced in, or the spar should be replaced.
5. a
Compression failures are characterized by a buckling of the fibers that appear as streaks on the surface of the piece, substantially at right angles to the grain.
6. c
Decay. All pieces must be free from rot, dote, red heart, purple heart, and all other forms of decay.
7. b
Mineral streaks are not acceptable in wood if they are accompanied by any decay.
8. a
I-beam spars are externally routed on both sides to reduce weight while retaining adequate strength.
9. b
Pin knot clusters. Small clusters are acceptable, provided they produce only a small effect on grain direction.
10. b
A cantilever wing is one that uses no external bracing.
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