diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 33f961be..747135e5 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1081,7 +1081,8 @@ def save_workout_database(f2, r, dosmooth=True, workouttype='rower',
                           makeprivate=False,
                           oarlength=2.89, inboard=0.88,
                           forceunit='lbs',
-                          consistencychecks=False):
+                          consistencychecks=False,
+                          impeller=False):
 
     message = None
     powerperc = 100 * np.array([r.pw_ut2,
@@ -1289,7 +1290,8 @@ def save_workout_database(f2, r, dosmooth=True, workouttype='rower',
                 startdatetime=workoutstartdatetime,
                 inboard=inboard, oarlength=oarlength,
                 timezone=timezone_str,
-                privacy=privacy)
+                privacy=privacy,
+                impeller=impeller)
     try:
         w.save()
     except ValidationError:
@@ -1421,24 +1423,32 @@ def handle_nonpainsled(f2, fileformat, summary=''):
     oarlength = 2.89
     inboard = 0.88
     hasrecognized = False
+    impeller = False
 
     row,hasrecognized,summary,fileformat = parsenonpainsled(fileformat,f2,summary)
 
     # Handle c2log
     if (fileformat == 'c2log' or fileformat == 'rowprolog'):
-        return (0,'',0,0,'')
+        return (0,'',0,0,'',impeller)
 
     if not hasrecognized:
-        return (0,'',0,0,'')
+        return (0,'',0,0,'',impeller)
 
     f_to_be_deleted = f2
     # should delete file
     f2 = f2[:-4] + 'o.csv'
     try:
         row2 = rrdata(df = row.df)
+        if fileformat == 'speedcoach2':
+            # impeller consistency
+            impellerdata, consistent, ratio = row.impellerconsistent(threshold=0.3)
+            if impellerdata and consistent:
+                impeller = True
+            if impellerdata and not consistent:
+                row2.use_gps()
         row2.write_csv(f2, gzip=True)
     except:
-        return (0,'',0,0,'')
+        return (0,'',0,0,'',impeller)
 
     # os.remove(f2)
     try:
@@ -1449,7 +1459,7 @@ def handle_nonpainsled(f2, fileformat, summary=''):
         except:
             pass
 
-    return (f2, summary, oarlength, inboard, fileformat)
+    return (f2, summary, oarlength, inboard, fileformat, impeller)
 
 # Create new workout from file and store it in the database
 # This routine should be used everywhere in views.py and mailprocessing.py
@@ -1476,6 +1486,7 @@ def new_workout_from_file(r, f2,
     inboard = 0.88
     if len(fileformat) == 3 and fileformat[0] == 'zip':
         f_to_be_deleted = f2
+        impeller = False
         workoutsbox = Mailbox.objects.filter(name='workouts')[0]
         msg = Message(mailbox=workoutsbox,
                       from_header=r.user.email,
@@ -1543,7 +1554,7 @@ def new_workout_from_file(r, f2,
 
     # handle non-Painsled by converting it to painsled compatible CSV
     if (fileformat != 'csv'):
-        f2, summary, oarlength, inboard, fileformat = handle_nonpainsled(
+        f2, summary, oarlength, inboard, fileformat, impeller = handle_nonpainsled(
             f2,
             fileformat,
             summary=summary
@@ -1571,7 +1582,8 @@ def new_workout_from_file(r, f2,
         summary=summary,
         inboard=inboard, oarlength=oarlength,
         title=title,
-        forceunit='N'
+        forceunit='N',
+        impeller=impeller,
     )
 
     return (id, message, f2)
diff --git a/rowers/models.py b/rowers/models.py
index 47b6d629..fd830b37 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -2734,6 +2734,7 @@ class Workout(models.Model):
                                choices=privacychoices)
     rankingpiece = models.BooleanField(default=False,verbose_name='Ranking Piece')
     duplicate = models.BooleanField(default=False,verbose_name='Duplicate Workout')
+    impeller = models.BooleanField(default=False,verbose_name='Impeller')
 
     def save(self, *args, **kwargs):
         user = self.user