Evaluating shrinkage of wood propellers in a high-temperature environment

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Evaluating shrinkage of wood propellers in a ...
Richard Bergman
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Last edited by MARC Bot
February 9, 2019 | History

Evaluating shrinkage of wood propellers in a high-temperature environment

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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.

Publish Date
Language
English

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Book Details


Edition Notes

Cover title.

"February 2008"--T.p. verso.

Includes bibliographical references (p. 6).

Also available on the World Wide Web.

Published in
Madison, WI
Series
Research note FPL -- 0309

Classifications

Library of Congress
SD433 .B47 2008

The Physical Object

Pagination
7 p. :

ID Numbers

Open Library
OL24021816M
LCCN
2008412900

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February 9, 2019 Created by MARC Bot import existing book