We don't handle propellers turning backwards. This got clamped

implicitly in PropEngine by disallowing negative torques, but that was
removed at some point.  We really need the explosion protection here
at the source.

diff --git a/src/FDM/YASim/Propeller.cpp b/src/FDM/YASim/Propeller.cpp
index ee5a9e0ee36dc243f9d42433c833a230b4c874d6..59e115b6fa9c0a7b28780375c73fb3a7c214785d 100644 (file)
--- a/src/FDM/YASim/Propeller.cpp
+++ b/src/FDM/YASim/Propeller.cpp
@@ -53,6 +53,9 @@ void Propeller::calc(float density, float v, float omega,
     // calculate V (propeller "speed")
     if(v < 0) v = 0;
 
+    // The model doesn't work for propellers turning backwards.
+    if(omega < 0.001) omega = 0.001;
+
     float J = v/omega;
     float lambda = J/_j0;