Dcs When to Use Cross Feed Fuel
The F-15 has often been labeled as the greatest U.S. fighter aircraft from the 1970s until the early 21st century. The F-15C is a pure fighter with outstanding performance and has scored over 100 air-to-air victories without suffering any confirmed losses. The DCS Flaming Cliffs F-15C includes a professional level flight model, a detailed 6 degrees of freedom capable cockpit, highly accurate external model and sounds.
As a DCS Flaming Cliffs title, F-15C focuses on ease of use without complicated cockpit interaction, significantly reducing the learning curve. As such, F-15C features keyboard and joystick cockpit commands with a focus on the most mission critical of cockpit systems.
Powerplant
Afterburner operation is simulated in detail, with complex afterburner spray ring calculations.
Startup procedure is fully modeled.
Pressing the Engine Start key initiates the automatic startup procedure, faithfully modeled in detail.
The model follows real-world steps needed to start the engine in a real F-15; however the current implementation can only be performed automatically without additional manual input by player.
The JFS (Jet Fuel Starter) pull-out handle starts the JFS. Upon JFS reaching sufficient speed, the READY lamp lights up on the right console. The engine start procedure begins a few seconds later based on selected input (left or right).
Two possibilities can arise after the first engine is started:
- If the command input is to start one engine, the JFS will turn off automatically;
- If the command input is to start two engines, JFS will work at idle for some time, then begin to spin the second engine.
The right engine is always started first when starting both engines. This way the hydraulic pump operated by the right engine can be checked.
JFS LOW display illuminates after the JFS is started, showing that one or both hydraulic accumulator are discharged. After starting the engine, the hydraulic pressure in the accumulator rises and the display will turn off.
Other indicator lights may illuminate during start-up, including L GEN OUT, R GEN OUT, or EMER BST ON. This is not a malfunction. However, if the lights remain on after the start-up procedure is completed, a malfunction may indeed have occurred.
Fuel System
The F-15C carries internal fuel in four fuselage and two wing tanks with total capacity of 2,070 gallons (7,836 liters).
The fighter can also carry up to three external fuel tanks, two under wing and one under fuselage, with a total capacity of 610 gallons (2,309 liters).
Maximum overall capacity for all internal and external tanks is 3,800 gallons (14,385 liters). The interconnected fuselage tanks are located behind the cockpit and under the speed brake, between the two engine air intake ducts.
All internal, external and CFT fuel can be dumped via the Fuel Dumping System through fuel vent outlets located at the trailing edge of each wingtip.
Aerial refueling can be accomplished via the Air Force type fixed boom system with an air refueling receptacle.
| Tank | Capacity (gal) | Fuel Weight (lbs) | Fuel Weight (kg) |
|---|---|---|---|
| Tank 1 | 655 | 4257 | 1931 |
| Right Feed | 234 | 1521 | 690 |
| Left Feed | 189 | 1228 | 557 |
| Left/Right Wing Internal | 496 | 3224.5 | 1462.5 |
| 496 | 3224.5 | 1462.5 | |
| TOTAL INTERNAL | 2070 | 13455 | 6103 |
| Left/Right Wing External Drop | 610 | 4072 | 1847 |
| 610 | 4072 | 1847 | |
| TOTAL INTERNAL + EXTERNAL WING DROP | 3290 | 21599 | 9797 |
| Fuselage Drop | 610 | 4072 | 1847 |
| TOTAL INTERNAL + EXTERNAL FUSELAGE DROP | 2680 | 17527 | 7950 |
| TOTAL INTERNAL + EXTERNAL DROP | 3800 | 25671 | 11644 |
| Maximum possible fuel capacity | 3800 | 25671 | 11644 |
Fuel transfer system is fully automatic. Fuel from external fuel tanks are transferred to the internal tanks by regulated engine bleed air pressure.
However, the 1 tank pump will not operate on the F-15C with the aerial refueling receptacle door open (SLIPWAY switch is not in the CLOSE position).
Fuel from external tanks will not feed if the landing gear handle is lowered, or if SLIPWAY switch is in the OPEN position, but only as long as the FUEL LOW light is not illuminated.
Normally, the left engine is powered by the Left engine feed tank, and the right engine by the Right engine feed tank. When flying on one engine, the engine feed tank of the disabled engine will not feed the running engine until the operative engine's feed tank fuel supply dips well below the FUEL LOW limits.
External Fuel Transfer Switch
The WING (for external wing tanks) and CTR (for centerline tank) switches are set to NORM for normal transfer and refuel functions when external tanks are used. The switches have no effect when external tanks are not used.
As conformal tanks are not covered in this model, the CONF TANK switch is set to STOP TRANS to maintain logical fuel flow.
The EXT TRANS switch is set to WING / CTR.
Fuel Quantity Indicating System
Combined indicator that displays different fuel quantities is located at the bottom right of the Main Instrument Panel.
The pointer shows the total internal fuel in thousands of lbs (readings must be multiplied by 1,000). The counter marked as "TOTAL LBS" indicates total internal, external, plus CFT fuel.
The two lower counters marked LEFT and RIGHT provide individual tank monitoring possibility. The tank to be monitored must be selected by a selector knob and the current fuel levels of the selected tank are indicated by the two counters.
The Selector knob is set to the "FEED" positions to display fuel state for engine feed tanks.
The LEFT and RIGHT lower counters therefore display total fuel in the left and right engine feed tanks.
FUEL LOW Caution
The FUEL LOW caution automatically displays, and the appropriate caution light illuminates, if fuel level in one of the engine feed tanks decrease below a minimal limit.
Individual fuel level sensors in the engine feed tanks are set to 1,000 pounds for the right engine feed tank, and 600 pounds for the left.
BINGO FUEL Caution
In a real F-15, the pilot can manually set bingo fuel level by a knob in the upper right corner of the Fuel Quantity Indicator display. Once this level is reached by the fuel quantity pointer, a BINGO FUEL caution on the MPD/ MPCD display comes on.
In the case of this simulation, BINGO fuel level is set to 3,500 lbs.
Fuel Dumping System
All internal, external and CFT fuel, except for fuel in engine feed tanks, can be dumped overboard.
With the landing gear handle lowered, fuel in external tanks is not dumped.
The dump switch is spring-loaded to the lever-locked NORM position. If the switch is placed into its DUMP position, it is held there electrically.
The fuel is dumped at an approximate rate of 390 PPM (pounds per minute) for the right wing tank and 260 PPM for the left wing tank and tank 1.
Note:
Unequal dumping rate for the left and right wing tanks creates an imbalance of approximately 130 pounds per minute. This imbalance continues to grow until all fuel is dumped from both wing tanks.
Fuel from the external wing tanks is pumped into internal tanks and then dumped.
Fuel dumping continues:
- While the switch remains in the DUMP position.
- Until the BINGO caution comes up, in which case the fuel dump switch returns to its NORM position automatically.
- Until there's no fuel left in the feed tanks. This is possible if the BINGO fuel level is set to less than 2,700 pounds.
Source: https://www.digitalcombatsimulator.com/en/products/planes/eagle_fc/?PAGEN_1=3
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