private double Kias(double grossWt, double alt)
{
if (alt <= 10000.0)
{
return(250.0);
}
var cruiseKias = fuelData.CruiseKias(grossWt);
var optAlt = fuelData.OptCruiseAlt(grossWt);
var optCruiseKtas = Ktas(cruiseKias, optAlt);
var kias = fuelData.ClimbKias;
var ktas = Ktas(kias, alt);
return(ktas > optCruiseKtas?KtasToKcas(optCruiseKtas, alt) : kias);
}
/// <summary>
/// Get AvgWindCalculator to approximate the wind.
/// Returns null if user disabled wind optimization.
/// </summary>
/// <exception cref="InvalidUserInputException"></exception>
public static AvgWindCalculator GetWindCalculator(
AppOptions appSettings,
Locator <IWxTableCollection> windTableLocator,
AirportManager airportList,
FuelDataItem fuelData,
double zfwTon,
string orig,
string dest)
{
if (!appSettings.EnableWindOptimizedRoute)
{
return(null);
}
if (windTableLocator.Instance is DefaultWxTableCollection)
{
throw new InvalidUserInputException(
"Wind data has not been downloaded or loaded from file.\n" +
"If you do not want to use wind-optimized route, it can be disabled " +
"from Options > Route.");
}
if (fuelData == null)
{
throw new InvalidUserInputException("No aircraft is selected.");
}
var origin = airportList[orig.Trim().ToUpper()];
if (orig == null)
{
throw new InvalidUserInputException("Cannot find origin airport.");
}
var destination = airportList[dest.ToUpper()];
if (dest == null)
{
throw new InvalidUserInputException("Cannot find destination airport.");
}
var dis = origin.Distance(destination);
var alt = fuelData.EstimatedCrzAlt(dis, zfwTon);
var tas = Ktas(fuelData.CruiseKias(zfwTon), alt);
return(new AvgWindCalculator(windTableLocator.Instance, tas, alt));
}
public static double EstimatedAvgWt(this FuelDataItem item,
double distance, double landingWt)
{
double grossWt = landingWt;
const int iteration = 2;
for (int i = 0; i < iteration; i++)
{
var alt = item.OptCruiseAlt(grossWt);
var ktas = Ktas(item.CruiseKias(grossWt), alt);
var time = distance / ktas * 60.0;
var ff = item.CruiseFuelFlow(grossWt);
grossWt = landingWt + ff * time / 2.0;
}
return(grossWt);
}
private double Kias(double grossWt, double alt, VerticalMode mode)
{
var cruiseKias = fuelData.CruiseKias(grossWt);
if (mode == VerticalMode.Cruise)
{
return(cruiseKias);
}
if (alt <= 10000.0)
{
return(250.0);
}
var optAlt = fuelData.OptCruiseAlt(grossWt);
var optCruiseKtas = Ktas(cruiseKias, optAlt);
var kias = mode == VerticalMode.Climb ?
fuelData.ClimbKias : fuelData.DescendKias;
var ktas = Ktas(kias, alt);
return(ktas > optCruiseKtas?KtasToKcas(optCruiseKtas, alt) : kias);
}
