Re: [Jsbsim-devel] Prop aircraft yaws to the right on take-off.

[Alan T. <ajt...@v-...>]

I have made some progress by adding the following code to FGLGear  
bind(). (near line 798) I can now see these properties in Flightgear.

   property_name = base_property_name + "/wheel-XForce-lbs";
   PropertyManager->Tie(property_name.c_str(), &vFn(eX));
   property_name = base_property_name + "/wheel-YForce-lbs";
   PropertyManager->Tie(property_name.c_str(), &vFn(eY));
   property_name = base_property_name + "/wheel-ZForce-lbs";
   PropertyManager->Tie(property_name.c_str(), &vFn(eZ));

   property_name = base_property_name + "/strutforce-lbs";
   PropertyManager->Tie(property_name.c_str(), &StrutForce);

The result of this is similar numbers in the property tree for 
wheel-ZForce-lbs and strutforce-lbs. With the throttle opened the 
numbers are larger for the left gear than the right gear, as expected. 
The value gets smaller as the aircraft accelerates on the runway.

However  the properties wheel-XForce-lbs and wheel-YForce-lbs are zero. 
They stay this way  even with the brakes applied despite the aircraft 
coming to a halt.

Is there any reason why vFn(eX) and vFn(eY) are zero?

Regards

Alan