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Curt noticed a while back that YASim was producing alpha and sideslip

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values that were angles between the aircraft's orientation and the
global velocity vector, not the airflow velocity.  So the HUD velocity
vector was wrong when the wind was non-zero.  Fix that.
This commit is contained in:
andy 2006-08-28 17:24:34 +00:00
parent 03bba2a792
commit 2f2d486778
3 changed files with 5 additions and 4 deletions
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5
src/FDM/YASim/Glue.cpp
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@ -2,11 +2,12 @@
#include "Glue.hpp"
namespace yasim {
void Glue::calcAlphaBeta(State* s, float* alpha, float* beta)
void Glue::calcAlphaBeta(State* s, float* wind, float* alpha, float* beta)
{
// Convert the velocity to the aircraft frame.
float v[3];
Math::vmul33(s->orient, s->v, v);
Math::sub3(s->v, wind, v);
Math::vmul33(s->orient, v, v);
// By convention, positive alpha is an up pitch, and a positive
// beta is yawed to the right.

2
src/FDM/YASim/Glue.hpp
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@ -10,7 +10,7 @@ namespace yasim {
// out the middle of the western hemisphere.
class Glue {
public:
static void calcAlphaBeta(State* s, float* alpha, float* beta);
static void calcAlphaBeta(State* s, float* wind, float* alpha, float* beta);
// Calculates the instantaneous rotation velocities about each
// axis.

2
src/FDM/YASim/YASim.cxx
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@ -441,7 +441,7 @@ void YASim::copyFromYASim()
// orientation
float alpha, beta;
Glue::calcAlphaBeta(s, &alpha, &beta);
Glue::calcAlphaBeta(s, wind, &alpha, &beta);
_set_Alpha(alpha);
_set_Beta(beta);