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Updated to latest JSBSim, including preliminary support for

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windmilling propellers.
This commit is contained in:
david 2001-12-25 00:02:25 +00:00
parent 73a898e346
commit 36f00b1c12
1 changed files with 11 additions and 1 deletions
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12
src/FDM/JSBSim/FGPropeller.cpp
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@ -154,9 +154,18 @@ double FGPropeller::Calculate(double PowerAvailable)
}
Thrust = C_Thrust*RPS*RPS*Diameter*Diameter*Diameter*Diameter*rho;
vFn(1) = Thrust;
omega = RPS*2.0*M_PI;
// Check for windmilling.
double radius = Diameter * 0.375; // 75% of radius
double windmill_cutoff = tan(Pitch * 1.745329E-2) * omega * radius;
if (Vel > windmill_cutoff) {
cout << "Windmilling: " << Vel << " > " << windmill_cutoff << endl;
Thrust = -Thrust;
}
vFn(1) = Thrust;
// The Ixx value and rotation speed given below are for rotation about the
// natural axis of the engine. The transform takes place in the base class
// FGForce::GetBodyForces() function.
@ -187,6 +196,7 @@ double FGPropeller::GetPowerRequired(void)
double rho = fdmex->GetAtmosphere()->GetDensity();
if (MaxPitch == MinPitch) { // Fixed pitch prop
Pitch = MinPitch;
cPReq = cPower->GetValue(J);
} else { // Variable pitch prop
double advance = fdmex->GetFCS()->GetPropAdvance(ThrusterNumber);