diff --git a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
index fb69507825..77dad6d371 100644
--- a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
+++ b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
@@ -38,7 +38,24 @@ namespace Foam
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
-Foam::scalar Foam::seriesProfile::evaluate
+Foam::scalar Foam::seriesProfile::evaluateDrag
+(
+    const scalar& xIn,
+    const List<scalar>& values
+) const
+{
+    scalar result = 0.0;
+
+    forAll(values, i)
+    {
+        result += values[i]*cos((i + 1)*xIn);
+    }
+
+    return result;
+}
+
+
+Foam::scalar Foam::seriesProfile::evaluateLift
 (
     const scalar& xIn,
     const List<scalar>& values
@@ -108,8 +125,8 @@ Foam::seriesProfile::seriesProfile
 
 void Foam::seriesProfile::Cdl(const scalar alpha, scalar& Cd, scalar& Cl) const
 {
-    Cd = evaluate(alpha, CdCoeffs_);
-    Cl = evaluate(alpha, ClCoeffs_);
+    Cd = evaluateDrag(alpha, CdCoeffs_);
+    Cl = evaluateLift(alpha, ClCoeffs_);
 }
 
 
diff --git a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.H b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.H
index 7c4793e28e..5e2611d6c3 100644
--- a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.H
+++ b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.H
@@ -28,7 +28,7 @@ Description
     Series-up based profile data - drag and lift coefficients computed as
     sum of cosine series
 
-        Cd = sum_i(CdCoeff)*sin(i*AOA)
+        Cd = sum_i(CdCoeff)*cos(i*AOA)
         Cl = sum_i(ClCoeff)*sin(i*AOA)
 
     where:
@@ -79,12 +79,21 @@ protected:
 
     // Protected Member Functions
 
-        //- Evaluate
-        scalar evaluate
-        (
-            const scalar& xIn,
-            const List<scalar>& values
-        ) const;
+        // Evaluate
+
+            //- Drag
+            scalar evaluateDrag
+            (
+                const scalar& xIn,
+                const List<scalar>& values
+            ) const;
+
+            //- Lift
+            scalar evaluateLift
+            (
+                const scalar& xIn,
+                const List<scalar>& values
+            ) const;
 
 
 public: