This guy shows up at the field with a low wing 40 size ARF. white trimmed in red and yellow. (sorry, I'm not familiar with ARFS ) He never asked for any type of help.
Later, we found out that he thought he could handle it because he can fly a park flyer.
Here's what happened: The climb out went well. and he got in the pattern just fine. At about 200 ft he had his hands full still trying to adjust the trims, I thought. After completing three high passes he put it in a shallow full power dive toward the end of the runway, then leveled off at 20 ft.
Then "it" happened, the best rekit I've ever seen. It exploded right before our eyes. no pitch changes, no roll input, not even a glitch. It just exploded.

investigation results:
The builder thought that the wing was a two piece, and the ply wood spar joiner comes out for transport. ( no glue ) and the dowel pins and the plastic bolts hold the wing together.
When the spar failed the wing split the fuselage in two . The canopy and the turtle deck went straight up taking the rudder with it. (it looked like the pilot punched out) And the motor. fire wall, cowl and nose gear was found at the end of the runway. the stabilizer hit the right wing and took out most of the ribs the left wing fluttered to the ground without a scratch. What a mess.

years ago out club president had a saying that stuck with me: I don't want to see any one crash their plane, but if they are going to crash I want to see it.