X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FFDM%2FLaRCsim%2Fc172_engine.c;h=64632a2d103557b79d4005c0da57f080bd855ff1;hb=e1d5a52a3a535007d4249aeba84fc645158997a7;hp=8ab7b4502d70658d7ad8e4ba8d5939118e19b8a0;hpb=1f1b2bab5025e8ce671e9edc0f187ff73117650d;p=flightgear.git

diff --git a/src/FDM/LaRCsim/c172_engine.c b/src/FDM/LaRCsim/c172_engine.c
index 8ab7b4502..64632a2d1 100644
--- a/src/FDM/LaRCsim/c172_engine.c
+++ b/src/FDM/LaRCsim/c172_engine.c
@@ -71,24 +71,33 @@ extern SIM_CONTROL	sim_control_;
 
 void c172_engine( SCALAR dt, int init ) {
     
-	float v,h,pa;
-	float bhp=160;
+    float v,h,pa;
+    float bhp=160;
 	
     Throttle[3] = Throttle_pct;
 
     
+    if ( ! Use_External_Engine ) {
+	/* do a crude engine power calc based on throttle position */
 	v=V_rel_wind;
 	h=Altitude;
 	if(V_rel_wind < 10)
-		v=10;
-    if(Altitude < 0)
-	   h=0;
+	    v=10;
+	if(Altitude < 0)
+	    h=0;
 	pa=(0.00144*v + 0.546)*(1 - 1.6E-5*h)*bhp;
 	if(pa < 0)
-		pa=0;
-	F_X_engine= Throttle[3]*(pa*550)/v;
-	M_m_engine = F_X_engine*0.734*cbar;
-	/* 0.734 - estimated (WAGged) location of thrust line in the z-axis*/
+	    pa=0;
+
+	F_X_engine = Throttle[3]*(pa*550)/v;
+    } else {
+	/* accept external settings */
+    }
+
+    /* printf("F_X_engine = %.3f\n", F_X_engine); */
+
+    M_m_engine = F_X_engine*0.734*cbar;
+    /* 0.734 - estimated (WAGged) location of thrust line in the z-axis*/
 
 }