This was my first opportunity to shoot prop planes. And subsequently first attempt at prop blur. I remembered reading a tip somewhere about 1/125 so I used that as a starting point. Was hard to tell on the back of my camera what the shots would look like. I couldn't see the blur, so really looked to me like it was blurred to the point it disappeared. I tried various shutter speeds from 1/125 and down. This was one of my better shots. Sadly the panning shots when it took off weren't sharp enough for my liking. I need to practice panning more, obviously!