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- 2008412900 abstract "Minimizing wood shrinkage is a priority for many wood products in use, particularly engineered products manufactured to close tolerances, such as wood propellers for unmanned surveillance aircraft used in military operations. Those currently in service in the Middle East are experiencing performance problems as a consequence of wood shrinking during long-term storage at low equilibrium moisture content conditions prior to installation. To evaluate the extent of shrinkage, seven sugar maple (Acer saccharum) veneer propellers were dried from 11% to 3% moisture content in a controlled environment of 150°F (65°C) for 3 days. Two of these wood propellers were encased in polyethylene bags. Results showed 5 to 20 times more shrinkage for the thickness of the propeller hub and the hub face perpendicular to the propeller blades (across the grain), respectively, compared with the hub face parallel to the blades (along the grain). Two hubs, coated with aluminum oxide paint, showed dimensional changes similar to those observed for uncoated hubs. For the two wood propellers encased in polyethylene bags, moisture loss was slowed during the course of the experiment by roughly 46%. Wrapping the wood propellers prior to shipping would slow moisture desorption, thereby minimizing shrinkage during short-term storage. Processing the propellers at a lower equilibrium moisture content would minimize shrinkage during long-term storage.".
- 2008412900 contributor B11266074.
- 2008412900 contributor B11266075.
- 2008412900 contributor B11266076.
- 2008412900 created "[2008]".
- 2008412900 date "2008".
- 2008412900 date "[2008]".
- 2008412900 dateCopyrighted "[2008]".
- 2008412900 description "Includes bibliographical references (p. 6).".
- 2008412900 description "Minimizing wood shrinkage is a priority for many wood products in use, particularly engineered products manufactured to close tolerances, such as wood propellers for unmanned surveillance aircraft used in military operations. Those currently in service in the Middle East are experiencing performance problems as a consequence of wood shrinking during long-term storage at low equilibrium moisture content conditions prior to installation. To evaluate the extent of shrinkage, seven sugar maple (Acer saccharum) veneer propellers were dried from 11% to 3% moisture content in a controlled environment of 150°F (65°C) for 3 days. Two of these wood propellers were encased in polyethylene bags. Results showed 5 to 20 times more shrinkage for the thickness of the propeller hub and the hub face perpendicular to the propeller blades (across the grain), respectively, compared with the hub face parallel to the blades (along the grain). Two hubs, coated with aluminum oxide paint, showed dimensional changes similar to those observed for uncoated hubs. For the two wood propellers encased in polyethylene bags, moisture loss was slowed during the course of the experiment by roughly 46%. Wrapping the wood propellers prior to shipping would slow moisture desorption, thereby minimizing shrinkage during short-term storage. Processing the propellers at a lower equilibrium moisture content would minimize shrinkage during long-term storage.".
- 2008412900 extent "7 p. :".
- 2008412900 hasFormat "Also available on the World Wide Web.".
- 2008412900 identifier fpl%5Frn309.pdf.
- 2008412900 isFormatOf "Also available on the World Wide Web.".
- 2008412900 isPartOf "Research note FPL ; 0309".
- 2008412900 issued "2008".
- 2008412900 issued "[2008]".
- 2008412900 language "eng".
- 2008412900 publisher "Madison, WI: Forest Products Laboratory,".
- 2008412900 relation "Also available on the World Wide Web.".
- 2008412900 subject "623.74/6042 22".
- 2008412900 subject "Propellers, Aerial Testing.".
- 2008412900 subject "SD433 .B47 2008".
- 2008412900 subject "Wood Testing.".
- 2008412900 title "Evaluating shrinkage of wood propellers in a high-temperature environment / Richard Bergman, Robert J. Ross.".
- 2008412900 type "text".