I ran the .46LA on my trainer, then reused the engine in my 4 * 40. I started out using a Master Airscrew 11 x 6. I later decided to try an APC. I put on an APC 11 x 6 and was amazed at the increase in performance. The plane was considerably faster and had much more vertical climb. The APC also caused a lot less vibration and noise. I now run a 50SX with an APC 12 x 7 and am very happy with the performance.
Scott