I have the BCMA 40cc and I can tell you it is powerful. The new pro 42 is supposed to be even more powerful. I just ordered a 52Pro for an Aviation Models 30% Extra 260 I'm going to put together. Haven't heard any hard facts on the 42 but after 7 20ounce tanks of gas the 40 puts out 19 pounds of static thrust with a Xoar 20x8. More then enough for the CAP. Once it's broken in it should develop 23 pounds of thrust in the air and 20-21 static.