KILN DRYING HANDBOOK. 
Table 6. — Aircraft Schedule I. 
39 
Stage of drying. 
Drying conditions. 
Maximum 
dry-bulb 
temper- 
ature. 
Minimum 
relative 
humidity. 
Wet bulb. 
At the beginning 
After fiber saturation is passed (25 per cent) 
At 20 per cent moisture 
At 15 per cent moistixre 
At 12 per cent moisture 
At 8 per cent moisture 
Final 
120 
125 
12s 
138 
142 
145 
145 
Per cent. 
80 
70 
60 
44 
38 
33 
33 
113 
114 
112 
112 
112 
110 
110 
SPECIES FOR WHICH AIRCRAFT SCHEDULE I IS APPLICABLE. 
Ash, white, blue, and Biltmore. 
Birch, yellow. 
Cedar, incense. 
Cedar, northern white. 
Cedar, western red. 
Cedar, Port Orford. 
Cypress, bald. 
Pine, sugar. 
Pine, white (eastern and western). 
Spruce, red and white. 
Spruce, Sitka. 
Table 
-Aircraft Schedule II. 
Stage of drying. 
Drying conditions 
Maximum 
dry-bulb 
temper- 
ature. 
Minimum 
relative 
humidity. 
Wet bulb. 
At the beginning , 
After fiber saturation is passed (25 per cent) 
At 20 per cent moisture 
At 15 per cent moisture 
At 12 per cent moisture 
At 8 per cent moisture 
Final 
105 
110 
117 
129 
135 
135 
135 
Per cent. 
85 
73 
62 
46 
42 
40 
40 
°F. 
100 
101 
103 
106 
109 
107 
107 
SPECIES FOR WHICH AIRCRAFT SCHEDULE II IS APPLICABLE. 
Cherry, black. 
Douglas fir. 
Mahogany. 
Oak, white, and red. 
Walnut, black. 
Maple (hard and soft). 
OAK WHEEL BLANKS. 
Several schedules have been developed for oak artillery-wheel 
stock — club-turned spokes and bent rims. Since oak is extremely 
variable in its drying characteristics, extreme care must be exer- 
cised in using these schedules. Steaming of bent rims must be 
done with caution, since over-steaming will relieve the set caused 
by the bending, thus allowing the stock to straighten out. Steaming 
for from 1 to 2 hours at 160 to 180° F. may be done periodically 
after the outer one-half inch has dried below 25 per cent. 
