Hi Guys, I got confused about which Norvel small engine to get, so I got all of them! An AME .049, Big Mig .061, and .074. I use the .049 and .061 interchangebly in a Herr Piper Cherokee. I pretend that the .049 is a Lycoming 0-360 Four banger, and the .061 is the Lycoming 0-540 Six banger. The .074 stays on my Schoolgirl. I pretend that she is either a Pitts or an Ag Cat, depending on the throttle setting. I do stunts for a while and then dust crops for a while kind of like a little kid with a toy. It puts a smile on my face.