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Page Title:
Table 8-4. Fuel Temperature Correction |
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 Table 8-4. Fuel Temperature Correction
Fuel Flow
Fuel Flow
Temp. F
No. / Hr. Max.
No. / Hr. Max.
Corr
Temp. F
-- rr
Co
+.020
307.0
80
313.0
60
.000
306.7
81
+.021
312.7
61
+.001
306.4
82
+.022
312.4
62
+.002
306.1
83
+ .023
312.1
63
+.003
305.8
+.024
84
311.8
64
+ .004
305.5
85
+ .025
311.5
65
+ .005
305,2
86
+.025
311.2
66
+ .006
304.9
87
+.027
310.9
67
+.007
304.6
88
+.028
310.6
68
+ .008
304.3
89
+.029
310.3
69
+.009
304.0
+.030
90
310.0
70
+.010
303.7
91
+.031
309.7
71
+.011
303.4
92
+.032
309.4
72
+.012
303.1
73
93
+.033
309.1
+.013
302.8
74
94
+.034
308.8
+.014
302.5
308.5
75
95
+.035
+.015
302.2
96
308.2
76
+.036
+.016
301.9
307.9
77
97
+.037
+.017
301,6
78
98
+.038
307.6
+.018
301.3
99
+ .039
307.3
79
+.019
2.
Corrected
net
BHP
-Observed
BHP
x)
1
Table 8-5. Fan Horsepower to be Used for Correcting
Engine Gross Horsepower
+ air temp. correction + Induction air pressure
correction + fuel temperature correction)
Engine Speed
(rpm)
3. Gross horsepower = c o r r e c t e d n e t B H P +
fan horsepower.
125.0
2520
4.
Correction factor references
108.0
2400
a. Induction air temperature correction
83.5
2200
62.5
2000
factor - Table 8-2
45.6
1800
b. Induction air pressure correction
32.0
1600
factor - Table 8-3
21.5
1400
c. Fuel temperature correction factor
13.5
1200
and maximum fuel flow - Table 8-4
7.2
1000
5.7
900
5. Specific fuel consumption =
Fuel flow lb/ hr.
FORMULAE
-
AVDS-1790-2A
Corrected gross BH P
6.
Specific
oil
consumption
=
Oil
Consumption
lb/
hr.
Corrected gross BHP
=
3.1416
7. Fuel Air Ratio = Fuel lb/ hr.
N
=
RPM
of
Dynamometer
shaft
Air
lb/
hr.
T
= Torque in lb. ft = LWZ
SAMPLE
CALCULATIONS:
= Length of torque arm in feet
L
= Weight of scale reading (lbs)
W
=
2400
Example: r p m
(Beam reading)
=
1339
torque
= Scale reading factor (ratio to
Z
beam
=
255
actual
weight,
in
units)
wet
barometer
=
29.64
If length of torque arm is 21.00 inches or 1.75
1. Dry barometer = 29.35
feet, and scale reading factor is 3, then
2. Average entrance pressure in inches of
OBHP = W N
water = 0
1000
8-11
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