/// <summary>
/// Flaps and brake settings can be overriden.
/// </summary>
/// <exception cref="Exception">Unexpected error</exception>
public static double LandingDistanceMeter(CalculatorData d,
string flaps = null, string brake = null)
{
var p = d.Parameters;
var t = d.Table;
if (flaps == null)
{
flaps = t.AllFlaps()[p.FlapsIndex];
}
if (brake == null)
{
brake = t.AllBrakes()[p.BrakeIndex];
}
// Matching table
var m = t.Entries.Where(x => x.Flaps == flaps && x.Autobrake == brake)
.First();
var weight1000LB = p.WeightKG / 1000 * Constants.KgLbRatio;
var(table, elevation, head, tail, reverser) = p.SurfaceCondition == 0
? (m.Dry, m.ElevationDry, m.HeadwindDry, m.TailwindDry, m.BothReversersDry)
: (m.Wet, m.ElevationWet, m.HeadwindWet, m.TailwindWet, m.BothReversersWet);
var len = table.ValueAt(weight1000LB);
var alt = ConversionTools.PressureAltitudeFt(p.ElevationFT, p.QNH);
len *= 1 + alt / 1000 * elevation / 100;
len *= 1 + (p.HeadwindKts >= 0 ?
(-head * p.HeadwindKts / 10) :
(tail * -p.HeadwindKts / 10)) / 100;
len *= 1 - (p.Reverser == 1 ? reverser : 0) / 100;
len *= 1 + (p.AppSpeedIncrease / 5) * (m.Speed5Knots / 100);
return(len * Constants.FtMeterRatio * t.Multiplier);
}
/// <summary>
/// Overrides the brake settings of CalculatorData.
/// </summary>
/// <exception cref="RunwayTooShortException"></exception>
/// <exception cref="Exception"></exception>
public static LandingReport LandingReport(CalculatorData d)
{
var p = d.Parameters;
var t = d.Table;
var all = t.AllBrakes().Select(b =>
{
return(ExceptionHelpers.DefaultIfThrows(() =>
{
var dis = LandingDistanceMeter(d, null, b);
return new ReportRow()
{
BrakeSetting = b,
RequiredDistanceMeter = RoundToInt(dis),
RemainingDistanceMeter = RoundToInt(p.RwyLengthMeter - dis)
};
}, null));
}).ToList();
var selected = all[p.BrakeIndex];
if (selected == null)
{
throw new Exception("Unexpected error occurred.");
}
if (selected.RemainingDistanceMeter < 0)
{
throw new RunwayTooShortException();
}
return(new LandingReport()
{
SelectedBrake = selected,
AllBrakes = all
});
}
