Jacked69, you might get a buddy with a tachometer to help you tune your Evolution .46 NT. Even with a 10x6 prop, that engine should have been able to make your Alpha .40 trainer scream at full throttle.

A good 11x6 propeller should make a big improvement, but only if the engine is dialed in properly. Make sure you're really getting the 11,500 to 12,000 or so RPMs at wide-open-throttle that you should be. No prop will run well if the engine isn't tuned correctly. You'll also want to make sure the engine is idling reliably down around 2400 to 2800 rpms. If the idle is above 3000 rpms with that 11x6 propeller, slowing down for landings will be an adventure.

jib's suggestion of the Aviastar .53 2-stroke available from http://www.sigmfg.com is a good example of a bargain engine that will haul around a .40-size sport plane with authority. Another good choice to look at is the JBA .56 2-stroke available from http://www.bj-model-engines.com/SKJBA.html or from http://www.kangkeusa.com The $79.99 JBA .56 has been tach'd side by side with O.S. Max .55 AX and turns almost identical rpms on the same propeller.

You can read about Ed Moorman's test results here: http://www.rcuniverse.com/forum/m_67...tm.htm#6762745

Ed Moorman is a big fan of the O.S. Max .55 AX, so his positive review of the JBA .56 is all the more interesting.

In any event, the right propeller and a really good tuning can be more effective than replacing an engine. Good luck!