From: ehofman <ehofman>
Date: Fri, 13 Feb 2004 12:54:38 +0000 (+0000)
Subject: Make sure the friction forces are positive, otherwise they will push the aircraft... 
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=c648bc18f756e1d4b9b4a33b9a62ebdee89654ec;p=flightgear.git

Make sure the friction forces are positive, otherwise they will push the aircraft rather than holding it into place. The ground reaction code still needs some attention.
---

diff --git a/src/FDM/JSBSim/FGLGear.cpp b/src/FDM/JSBSim/FGLGear.cpp
index fb3748211..3de603f40 100644
--- a/src/FDM/JSBSim/FGLGear.cpp
+++ b/src/FDM/JSBSim/FGLGear.cpp
@@ -403,6 +403,11 @@ FGColumnVector3& FGLGear::Force(void)
         FCoeff = dynamicFCoeff*fabs(WheelSlip)/WheelSlip;
       }
 
+      // A negative force coefficient will result in a force pulling the wheel(s)
+      // back instead of trying to stop them from moving.
+      if (FCoeff < 0.0)
+          FCoeff = 0.0;
+
 // Compute the vertical force on the wheel using square-law damping (per comment
 // in paper AIAA-2000-4303 - see header prologue comments). We might consider
 // allowing for both square and linear damping force calculation. Also need to