diff --git a/include/sim.h b/include/sim.h
index e156e66..e8aa8d6 100644
--- a/include/sim.h
+++ b/include/sim.h
@@ -87,12 +87,6 @@ void burnStartTimeCalc(struct sVars &Vars) {
 }
 
 void thrustSelection(struct sVars &Vars, int t) {
-  // TODO: Determine a real tolerance
-  double tol = 0.001; // 0.001 seems to be a nice tolerance
-
-  // Check to see if current velocity is close to the F15's total velocity
-  bool b_burnStart = (Vars.burnVelocity < (1 + tol) * Vars.vz * -1) &
-                     (Vars.burnVelocity > (1 - tol) * Vars.vz * -1);
 
   if (Vars.burnElapsed != 2000) {
     // determine where in the thrust curve we're at based on elapsed burn time
@@ -101,7 +95,7 @@ void thrustSelection(struct sVars &Vars, int t) {
     Vars.mass = Vars.massInitial - (Vars.mdot * Vars.burnElapsed);
   }
 
-  else if (b_burnStart) {
+  else if (abs(Vars.burnVelocity - Vars.vz) < .001) {
     // Start burn
     Vars.burnStart = t;
     Vars.burnElapsed = 0;