曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
13000 15000 17650
+0.39 +0.34 +0.27
+0.41 +0.35 +0.25
+0.37 +0.31 +0.18
+1.05 +0.89 +0.68
+2.25 +1.88 +1.44
+1.51 +1.28 +0.99
+3.21 +2.75 +2.11
-0.22 -0.19 -0.16
500 lbs per tank -0.15 -0.13 -0.11 -0.35 +0.29 +0.15
1000 lbs per tank -.048 -0.40 +0.41 +016
Fill Tank -2.31 -1.91 -1.18 -1.21
Note: A plus (+) means aircraft CG moves aft and negative (-) means forward CG movement.
*The above fuel values represent the total fuel on board such that the 500 lb, 1000 lb, or full in each tank is
the starting point and the expended fuel is 500 lb, 1000 lb, or full leaving zero fuel in each tank.
6-5
TM 1-1520-238-10
Section III. FUEL AND OIL
6.11 OIL WEIGHT AND MOMENT.
For weight and balance purposes, oil is considered a
part of aircraft basic weight.
6.12 FUEL WEIGHT AND MOMENT.
When the actual or planned fuel loading (pounds or gallons)
and type is known, the total fuel weight and moment/
100 can be determined from the fuel moment
Tables 6-2 and 6-3. The tables present data for JP-4,
JP-5, and JP-8 based on the approximate density for
these fuels at 15 degrees centrigrade. The following information
is provided to show the general range of fuel
density to be expected. Density of the fuel will vary depending
on fuel temperature. Density will decrease as
fuel temperature rises and increase as fuel temperature
decreases at the rate of approximately 0.1 lb/gal
for each 15 degree centrigrade temperature change.
Density may also vary between lots of the same fuel at
the same temperature by as much as 0.5 lb/gal. The full
tank usable fuel weight presented in the tables for density
closest to that of the fuel being used may be used
for mission planning. The aircraft fuel gage system was
designed for use with JP-4, but does tend to compensate
for other fuels and provide acceptable readings.
When possible the weight of fuel onboard should be determined
by direct reference to aircraft fuel gages.
6.12.1 Fuel Moments. The forward fuel moment calculations
are complicated by the L-shape of the tank.
Consider the tank being filled from empty to 132.8 gallons;
the fuel cg remains constant at 150.6 inches. From
132.8 gallons to full (156 gallons), the cg of the total fuel
moves aft linearly to 153.7 inches at capacity. The aft
fuel cg is constant at 255 inches.
6.13 AUXILIARY FUEL TANKS.
A slight increase in the risk of postcrash
fire exists if a mishap occurs after
tanks are pressurized. Crashworthiness
of the fuel system is
reduced by external fuel tanks,
which are designed for FERRY MISSION
ONLY. External fuel tank
installation is prohibited for use in
tactical missions.
The auxiliary fuel tanks are installed on the wing pylons
in sets of two or four and are for extending the helicopter
ferry range. Plumbing from the fuselage to the
tank is provided with each tank. Each tank has a capacity
of approximately 230 gallons. Table 6-4 lists the
weight and moment/100 of each fuel tank, wing plumbing
and total fuel for JP-4, JP-5, and JP-8. Note that the
data are given for one tank, wing plumbing, and indicated
fuel so that any combination can be determined.
The table can be used for inboard and outboard locations
because the small moment/100 differences can be
ignored. Remember to add the tank, and specific fuel
together for one location, then multiply by 2 or 4 depending
on the number of tanks carried. Add wing
plumbing for 2 or 4 tanks as appropriate.
6-6 Change 4
TM 1-1520-238-10
Table 6-2. Fuel Loading - Forward Tank
NOTE
Moment varies slightly with fuel density. Moments listed are based on JP-4 @ 6.5 lb/gal. These values
may be used for JP-5 or JP-8 as the variation with fuel density is small.
Change 2 6-7
TM 1-1520-238-10
Table 6-3. Fuel Loading - Aft Tank
6-8 Change 2
TM 1-1520-238-10
Table 6-4. Auxiliary Fuel Tanks
JP-4 Density= 6.5 lb/gal
JP-5 Density= 6.8 lb/gal
JP-8 Density= 6.7 lb/gal
Auxiliary. Tank
Weight Moment/ US.
Item Each (lb) 100 Gallons
Auxiliary Fuel Tank 140.0 268 —
Wing Tank Plumbing
2 Tanks 16.0 35 —
4 Tanks 20.0 43 —
JP-4 Fuel (Capacity) 1495.0 2906 230.0
JP-5 Fuel (Capacity) 1564.0 3040 230.0
JP-8 Fuel (Capacity) 1541.0 2996 230.0
Note 1: Weight and moment are shown for one tank with fuel; and must be
doubled for two inboard or multiplied by 4 when inboard and outboard
stations are used.
Note 2: Add wing tank plumbing for 2 tanks or 4 tanks as appropriate.
6-9
TM 1-1520-238-10
Section IV. PERSONNEL
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