My guess is that the tail and nose of the jet didn't stay aligned well enough coming out of the loop as a result of not enough rudder being applied to keep the tail alignment to the nose during the loop. Inthe frame at <u>0:46 seconds </u>where the jet is at the bottom right of the video frame and immediately before the reversal snap-roll into the spin (at 0:47) the tail looks like it is sliding inward slightly toward the low wing. Looking at the wings at that same 0:46 frame they look they are starting to go a tad cockeyed to what thelongitudinal axis of the fuselage would be if it wasn't yawing. As such the fuselage begins to yaw its nose slightly outward toward the high wing. This is pulling the high wing out of optimum relative air flow position which will cause a separation of the air from the wing.The fuselage because of its turning slighly inward begins to induce drag which just compounds the situation further.

The fuselage at this point might be angled inward enough toward the low wing immediately before the snap-roll that the rudder would be rendered ineffective in holding the tail position in its alignment with the nose. Almost exactly at that same moment when this is occuring the snap-roll begins to occur rolling the jet toward thehigh-wing side. In essence the high wing leading edge was pulled out of position enough to cause separation of airflow fromthat high wing. Given the pulling of the wing out of position, the canards probably functionally failed as well.

So the root cause may fall to the side ofthe old proverbial [NTSB] "pilot-error" as a result of performing a loop without sufficient surface controlsthatheallowed the tail to slide toward the low wing. The rest is unfortunately history. I'm sorry tohave "thrown the pilot under the bus" on response but most crashes in real flyingor RC are due to pilot error, notalways necessarily strictly mechanical failure. There is no distructive intent toward the pilot with my opinion on this post. I wasn't there and at best Iam playing "armchair". The best of pilots make mistakes as we are all human.This doesn't mean the pilot is a bad pilot. It just means thepilot may have gotten a little behindin controlling thejet.....and then again maybe upon examination of the jet it will be discovered that a mechanical failure did in-fact occur.....