diff --git a/src/app/shipyard/Calculations.js b/src/app/shipyard/Calculations.js
index 0b9873ff..23ad030a 100644
--- a/src/app/shipyard/Calculations.js
+++ b/src/app/shipyard/Calculations.js
@@ -293,7 +293,7 @@ export function calcRoll(mass, baseRoll, thrusters, engpip, eng, boostFactor, bo
   let minMul = thrusters instanceof Module ? thrusters.getMinMul('rotation') : (thrusters.minmulrotation ? thrusters.minmulrotation : thrusters.minmul);
   let optMul = thrusters instanceof Module ? thrusters.getOptMul('rotation') : (thrusters.optmulrotation ? thrusters.optmulrotation : thrusters.optmul);
   let maxMul = thrusters instanceof Module ? thrusters.getMaxMul('rotation') : (thrusters.maxmulrotation ? thrusters.maxmulrotation : thrusters.maxmul);
-
+  eng = 0;
   let result = calcValue(minMass, optMass, maxMass, minMul, optMul, maxMul, mass, baseRoll, engpip, eng);
   if (boost == true) {
     result *= boostFactor;
@@ -321,7 +321,7 @@ export function calcYaw(mass, baseYaw, thrusters, engpip, eng, boostFactor, boos
   let minMul = thrusters instanceof Module ? thrusters.getMinMul('rotation') : (thrusters.minmulrotation ? thrusters.minmulrotation : thrusters.minmul);
   let optMul = thrusters instanceof Module ? thrusters.getOptMul('rotation') : (thrusters.optmulrotation ? thrusters.optmulrotation : thrusters.optmul);
   let maxMul = thrusters instanceof Module ? thrusters.getMaxMul('rotation') : (thrusters.maxmulrotation ? thrusters.maxmulrotation : thrusters.maxmul);
-
+  eng = 0;
   let result = calcValue(minMass, optMass, maxMass, minMul, optMul, maxMul, mass, baseYaw, engpip, eng);
   if (boost == true) {
     result *= boostFactor;