AIRCRAFT WOODS: Their Properties, Selection, and Characteristics
(REPRINT FROM NATIONAL ADVISORY COMMITTE E FOR AERONAUTICS REPORT 354)
October 1941
THIS REPORT IS ONE OF A SERIES ISSUE D TO AID THE NATION S WAR PROGRA M
No. 1079
UNITED STATESLDEPARTMENT OF AGRICULTURE -- ~~FOREST SERVIC E I~~FOREST PRODUCTS LABORATOR Y Madison, Wisconsi n In Cooperation with the University of Wisconsi n r
CONTENTS
Summary : : i Introduction : 2 Strength values for aircraft design 2 Other properties needed in aircraft desiga 3 Tensile stress . .stress 3 i Torsional properties Form factors 4 Adjustment of Table 1values Moisture coatsn$ + Variability 5 Duration of stress : 7 Selection of material S Primary factors in selecting wood s .~ 9 Specific gravity-etrg gtb. relations 9 Minimum specific gravity- reglsirement 10 Permissible defects 11 Cross grain 11 Defects causing cross grain and limited thereby 13 Shakes and checks 15 Mineral streaks 15 Injury resulting from insect attack 15 Seasoning defects 16 Manufacturing defects 16 Prohibited defects IT Lscmy 17 . Compression wood IS Compression failures 18 Secondary factors in selecting wood, 19 Locality of growth 19 Bate of growth 20 . Position in tree