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9ec879cea0
Ported the existing docs, but the real goal is getting the docs for campaign version moved here, as well as the manual. RTD will have an "edit on github" button that'll keep this accessible to players, but it'll be much easier to keep docs up to date while developing features if it's part of the code base.
81 lines
2.8 KiB
Markdown
81 lines
2.8 KiB
Markdown
# Measuring estimated fuel consumption
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To estimate fuel consumption numbers for an aircraft, create a mission with a
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typical heavy load for the aircraft. For example, to measure for the F/A-18C, a
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loadout with two bags, two GBU-31s, two sidewinders, an AMRAAM, and an ATFLIR.
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Do **not** drop bags or weapons during the test flight.
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Start the aircraft on the ground at a large airport (for example, Akrotiri) at a
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parking space at the opposite end of the takeoff runway so you can estimate long
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taxi fuel consumption.
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When you enter the jet, note the amount of fuel below, then taxi to the far end
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of the runway. Hold short and note the remaining fuel below.
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Follow a typical takeoff pattern for the aircraft. For the F/A-18C, this might
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be AB takeoff, reduce to MIL at 350KIAS, and maintian 350KIAS/0.85 mach until
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cruise altitude (angles 25).
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Once you reach angels 25, pause the game. Note your remaining fuel below and
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measure the distance traveled from takeoff. Mark your location on the map.
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Level out and increase to cruise speed if needed. Liberation assumes 0.85 mach
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for supersonic aircraft, for subsonic aircraft it depends so pick something
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reasonable and note your descision in a comment in the file when done. Maintain
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speed, heading, and altitude for a long distance (the longer the distance, the
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more accurate the result, but be careful to leave enough fuel for the final
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section). Once complete, note the distance traveled and the remaining fuel.
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Finally, increase speed as you would for an attack. At least MIL power,
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potentially use AB sparingly, etc. The goal is to measure fuel consumption per
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mile traveled during an attack run.
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```
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start:
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taxi end:
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to 25k distance:
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at 25k fuel:
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cruise (.85 mach) distance:
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cruise (.85 mach) end fuel:
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combat distance:
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combat end fuel:
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```
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Finally, fill out the data in the aircraft data. Below is an example for the
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F/A-18C:
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```
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start: 15290
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taxi end: 15120
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climb distance: 40NM
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at 25k fuel: 13350
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cruise (.85 mach) distance: 100NM
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cruise (.85 mach) end fuel: 11140
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combat distance: 100NM
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combat end fuel: 8390
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taxi = start - taxi end = 15290 - 15120 = 170
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climb fuel = taxi end - at 25k fuel = 15120 - 13350 = 1770
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climb ppm = climb fuel / climb distance = 1770 / 40 = 44.25
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cruise fuel = at 25k fuel - cruise end fuel = 13350 - 11140 = 2210
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cruise ppm = cruise fuel / cruise distance = 2210 / 100 = 22.1
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combat fuel = cruise end fuel - combat end fuel = 11140 - 8390 = 2750
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combat ppm = combat fuel / combat distance = 2750 / 100 = 27.5
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```
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```yaml
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fuel:
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# Parking A1 to RWY 32 at Akrotiri.
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taxi: 170
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# AB takeoff to 350/0.85, reduce to MIL and maintain 350 to 25k ft.
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climb_ppm: 44.25
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# 0.85 mach for 100NM.
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cruise_ppm: 22.1
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# ~0.9 mach for 100NM. Occasional AB use.
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combat_ppm: 27.5
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min_safe: 2000
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```
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The last entry (`min_safe`) is the minimum amount of fuel that the aircraft
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should land with.
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