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26 Cards in this Set
- Front
- Back
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What does "solid" wood imply? |
Member consisting of one piece of wood |
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What is laminated wood? |
Assembly of two or more layers of wood glued together with the grains approximately parallel |
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What is plywood? |
Odd number of thin plies or veneers with the grain of each layer placed 90° with adjacent plies |
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What are high density wood materials? |
Compreg, impreg or similar heat stabilised wood, or any of the hardwood plywoods |
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What loads are wooden glue joints meant to take? |
Shear |
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No matter what wood is used, the slope of the grain cannot be steeper than...? |
1:15 |
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What is softwood used for? |
Structural repair/construction |
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Is cross grain-sprial grain, diagonal grain acceptable as a wood defect? |
Yes as long as the grain does not diverge from the longitudinal axis more than the specified amount |
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Are wavy, curly and inter locked grains (wood) acceptable in wooden structures? |
Yes if local irregularities dont exceed limitations specified |
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Are hard knots acceptable in wood? |
Up to 3/8inch diameter |
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Are pin knot clusters acceptable in wood structures? |
Small one are acceptable if only a small effect on grain direction |
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What defects are not permitted in wooden structures? |
Cross grain Wavy curly and interlocked grain Hard knots Pin knot clusters Spike knots Pitch pockets Mineral streaks accompanied by decay Checks shakes and splits Compression wood Compression failures Tension Decay |
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What adhesives in wooden aicraft I'd considered obsolete and deteriorates when exposed to moisture? |
Casein glue and plastic resin glue |
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What is open assembly time, closed assembly time, and pressure time? (Wooden) |
Time between adhesive applied and assembly of components Tinw between contact and pressure applied Time between pressure applied and cured |
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What are the preparations for wood gluing? |
Proper and equal moisture contents of woods to joined Machined or planed surfaces Selection of proper adhesive Application of good.gluing technique Gluing under recommended temp conditions |
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What temp should wood gluing be done? |
Above 70°f |
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A damaged wooden spar may be spliced any where except...? |
Wing/landing gear/engine mount/lift and interplane fittings |
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What should not be used in spar repairs? |
Nails/screws |
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What drill is used for wood boring? |
Lip and spur/Brad point |
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What repair is used to repair small holes in plywood? |
Fabric patch |
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What repair is used on plywood small holes where the largest dimension of the hole is not more than 15 times skin thickness ? |
Splayed patch |
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What repair us used for plywood skins not over 1/8inch thick damaged along framing members? |
Surface patch |
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Where is a plug patch on wood used? |
Plywood skins where cutout is no larger than 6 inches diameter |
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What is the preferred repair for plywood? |
Scarf patch |
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What types of wood decay are there? |
Rot, dote, red heart, purple heart |
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How much wood decay is allowed? |
None |
