I've got the brillelli 26 in mine with a sullivan smoke system, so my stearman weighs around 17 or 18 pounds and the 26 will pull it strait up as far as you want to go. The 46 might damage the plane. I will post a picture of it when I take it out next, I took out the front cockpit and sheeted over the hole and intend on putting a red checker board pattern on the bottom of the wings and horizontal stab as soon as the ups man brings my monocote.