[Jsbsim-cvslogs] CVS: JSBSim/src/models/propulsion FGPropeller.cpp, 1.57, 1.58

[Bertrand <bco...@us...>]

Update of /cvsroot/jsbsim/JSBSim/src/models/propulsion
In directory sfp-cvs-1.v30.ch3.sourceforge.com:/tmp/cvs-serv470/src/models/propulsion

Modified Files:
	FGPropeller.cpp 
Log Message:
Removed this condition since it gives an erratic behaviour to the induced velocity computations when the aero velocity has a very small magnitude and is oscillating around zero.

Index: FGPropeller.cpp
===================================================================
RCS file: /cvsroot/jsbsim/JSBSim/src/models/propulsion/FGPropeller.cpp,v
retrieving revision 1.57
retrieving revision 1.58
diff -C2 -r1.57 -r1.58
*** FGPropeller.cpp	2 Jan 2016 17:42:53 -0000	1.57
--- FGPropeller.cpp	4 Jun 2016 11:06:51 -0000	1.58
***************
*** 242,259 ****
    else
      Vinduced = 0.5 * (-Vel - sqrt(-Vel2sum));
- 
-   // We need to drop the case where the downstream velocity is opposite in
-   // direction to the aircraft velocity. For example, in such a case, the
-   // direction of the airflow on the tail would be opposite to the airflow on
-   // the wing tips. When such complicated airflows occur, the momentum theory
-   // breaks down and the formulas above are no longer applicable
-   // (see H. Glauert, "The Elements of Airfoil and Airscrew Theory",
-   // 2nd edition, §16.3, pp. 219-221)
- 
-   if ((Vel+2.0*Vinduced)*Vel < 0.0) {
-     // The momentum theory is no longer applicable so let's assume the induced
-     // saturates to -0.5*Vel so that the total velocity Vel+2*Vinduced equals 0.
-     Vinduced = -0.5*Vel;
-   }
      
    // P-factor is simulated by a shift of the acting location of the thrust.
--- 242,245 ----