Dear Experts! I am currently try to measure the drag of an buoyant object. I did 10 replicates, in general terms 10 tests all with the same set-up and same release mechanisms. To start off with I will explain my project: Drag reduction in swim cap First of all I got one accelerometer with buoyant object. This buoyant object is shown in picture. Which I will measure the drag associated with this object (drag coefficient Cd). To do so I get a set of data acceleration versus time in X direction. Then I numerically integrate it to get velocity and again to get time. The issue I am having is I couldn't get the data to overlap or consistent otherwise it would be pointless to say that ok the hydrophobic or hydrophilic solution that being used for the swim cap is actually reducing the drag. It would be great if someone could explain the actual way of processing the data. Or if it is an unavoidable issue. It really hard for this problem in my report. Thanks.