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https://github.com/dcs-liberation/dcs_liberation.git
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211ec86e2e
This PR 1) introduces a cruise_speed parameter to the AircraftType class and uses it as an override for default TOT/Ground Speed calculations and 2) sets this for the AH64. The reason for this change is that air starts with the Apache at a speed >130kt seems to completely break the FCR, even if you subsequently slow down. In the development branch, Liberation sets the Apache to travel at 168kt, so any player air starting won't be able to use their FCR and it wouldn't be readily apparent as to why. In the longer run this parameter may also be useful for other aircraft e.g. to override the cruise speed to the most efficient etc.
66 lines
2.4 KiB
Python
66 lines
2.4 KiB
Python
from __future__ import annotations
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from datetime import datetime
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from typing import TYPE_CHECKING
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from game.utils import Distance, SPEED_OF_SOUND_AT_SEA_LEVEL, Speed, mach
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if TYPE_CHECKING:
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from .flight import Flight
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from .package import Package
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class GroundSpeed:
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@classmethod
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def for_flight(cls, flight: Flight, altitude: Distance) -> Speed:
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# TODO: Expose both a cruise speed and target speed.
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# The cruise speed can be used for ascent, hold, join, and RTB to save
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# on fuel, but mission speed will be fast enough to keep the flight
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# safer.
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if flight.squadron.aircraft.cruise_speed is not None:
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return mach(flight.squadron.aircraft.cruise_speed.mach(), altitude)
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# DCS's max speed is in kph at 0 MSL.
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max_speed = flight.unit_type.max_speed
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if max_speed > SPEED_OF_SOUND_AT_SEA_LEVEL:
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# Aircraft is supersonic. Limit to mach 0.85 to conserve fuel and
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# account for heavily loaded jets.
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return mach(0.85, altitude)
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# For subsonic aircraft, assume the aircraft can reasonably perform at
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# 80% of its maximum, and that it can maintain the same mach at altitude
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# as it can at sea level. This probably isn't great assumption, but
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# might. be sufficient given the wiggle room. We can come up with
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# another heuristic if needed.
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cruise_mach = max_speed.mach() * 0.85
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return mach(cruise_mach, altitude)
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# TODO: Most if not all of this should move into FlightPlan.
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class TotEstimator:
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def __init__(self, package: Package) -> None:
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self.package = package
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def earliest_tot(self, now: datetime) -> datetime:
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if not self.package.flights:
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return now
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return max(self.earliest_tot_for_flight(f, now) for f in self.package.flights)
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@staticmethod
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def earliest_tot_for_flight(flight: Flight, now: datetime) -> datetime:
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"""Estimate the earliest time the flight can reach the target position.
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The interpretation of the TOT depends on the flight plan type. See the various
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FlightPlan implementations for details.
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Args:
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flight: The flight to get the earliest TOT for.
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now: The current mission time.
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Returns:
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The earliest possible TOT for the given flight.
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"""
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return now + flight.flight_plan.minimum_duration_from_start_to_tot()
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