I think you misunderstood me. The tumble was intentional. The pilot was showing off. The plane did not tip stall. Also, I did not say mine tip stalls badly. When it stalls, yes one wing drops a little, but it is not violent and is easily recoverable. Many r/c planes behave this way. I calculated the wing area on my Fun One to be 556.5 square inches. My plane weighs 5.5 lbs. When you do the math and the conversions, that comes out to a wing loading of about 23 oz/ft^2 . I will graduate in May with an Aerospace Engineering degree and am in the process of designing an r/c plane for our senior design project. I've done my research and this is not a high wing loading. I do know of some things that could be contributing to your plane flying badly.

1) If your CG is too far forward, it effectively increases your wing loading and can make it behave the same way as having a high wing loading. I had to add several ounces of lead to the tail of my Fun One.

2) The bad tip stalling could be caused by a warped wing. If your wing tips have negative washout (wing tips are at a higher incidence than the wing root), then they can stall before the wing root and cause it to tip stall violently.

FYI: A high wing loading does not cause a plane to tip stall. Wing loading is directly related to the stall speed of the plane, though. The higher the wing loading, the higher the stall speed. The cause of tip stalling is when the wing tip stalls before the wing root.