The moment of the plane (or its overall length) will also greatly affect its ability to tumble. Airframes with a SHORTER moment will generally tumble better. Typically I would put my planes into a straight vertical climb, pull the throttle back and right before the stall give it full down elevator and full throttle (might mix in some rudder).

A biplane such as the Pitts or Christen eagle will tumble VERY well. Caps, Edges, and others with a shorter moment for an acrobatic plane also tumble well.

The other approach is similar to a blender but I warn you in real life there is a posibility you can tear apart your plane if you enter the maneuver too fast or if there is any structural issues.