[Csp-commits] svn:csp r1410 - in trunk/CSP/CSPSim: . Source

[<sv...@ww...>]

Author: mkrose
Date: 2004-12-18 03:39:57 -0800 (Sat, 18 Dec 2004)
New Revision: 1410

Modified:
   trunk/CSP/CSPSim/CHANGES.current
   trunk/CSP/CSPSim/Source/Engine.cpp
Log:
Hack upon hack to prevent engine cutoff when stationary in a light
tailwind (AOA near 180 deg).

Browse at: https://www.zerobar.net/viewcvs/viewcvs.cgi?view=rev&rev=1410

Modified: trunk/CSP/CSPSim/CHANGES.current
===================================================================
--- trunk/CSP/CSPSim/CHANGES.current	2004-12-18 11:38:01 UTC (rev 1409)
+++ trunk/CSP/CSPSim/CHANGES.current	2004-12-18 11:39:57 UTC (rev 1410)
@@ -11,6 +11,9 @@
    3160.  You still need to specify ServerIp to connect to remote index
    servers.
 
+ * Hack upon hack to prevent engine cutoff when stationary in a light
+   tailwind (AOA near 180 deg).
+
 2004-12-18: delta
  * Until we make a more accurate FCS, we'll use the animation binding to
    provide a better visual approximation of the animations of the "ailerons"

Modified: trunk/CSP/CSPSim/Source/Engine.cpp
===================================================================
--- trunk/CSP/CSPSim/Source/Engine.cpp	2004-12-18 11:38:01 UTC (rev 1409)
+++ trunk/CSP/CSPSim/Source/Engine.cpp	2004-12-18 11:39:57 UTC (rev 1410)
@@ -169,17 +169,20 @@
 
 void EngineDynamics::cut() {
 	double alpha = b_Alpha->value();
+	// f is a totally ad-hoc means of preventing a slight tailwind from killing
+	// the engine when we aren't moving.
+	double f = simdata::clampTo(4.0 * (b_Mach->value() - 0.25), 0.0, 1.0);
 	if ((std::abs(alpha) > simdata::PI_2) || (alpha < -m_A)) {
-		m_Force = simdata::Vector3::ZERO;
+		m_Force *= (1.0 - f);
 	}
 	else if (alpha < m_B) {
-		m_Force *= cos( flatten(alpha));
+		m_Force *= (1.0 - f) + f * cos(flatten(alpha));
  	}
 	else if (alpha < m_C) {
-		m_Force *= cos(m_B + (simdata::PI_2 - m_B)*(alpha - m_B)/(m_C-m_B));
+		m_Force *= (1.0 - f) + f * cos(m_B + (simdata::PI_2 - m_B)*(alpha - m_B)/(m_C-m_B));
 	}
 	else {
-		m_Force = simdata::Vector3::ZERO;
+		m_Force *= (1.0 - f);
 	}
 }