ORIGINAL: Ali

Scary as it is, but I find myself agreeing with bevar
I have flown enough viper jets to know there is nothing wrong with their aerodynamics. I have flown and demoed them flying at what seems like just above walking pace.Its a simple case of it being 40 lbs (+ in some cases) of jet. That wing can only work to a certain point and then it just gives up, like all wings do. When it does, and depending on the pilots inputs the result can be messy. I think in many cases that the big viper is just too much of a jump for some pilots unassisted. Flying the bigger and higher loaded jets is different and requires some different techniques. Things that you would get away with on a lighter loaded sports jet or aerobatic model will bite you in the *****.
As with the first Vjet crash ( From the top of a loop) There will be lots and lots of conjecture about reasons why. There will be technical analysis into down wind turns, Conspiracy theories about airframe design, construction and even radio failure. But just as per that first viper crash, I am going to stick my neck out and say the unpopular thing, in that I think it was a piloting error. We have all made them, and will carry on making them. ( Its the nature of being human) I just hope we can learn from it.
If I get time, I will try to post some videos in the coming weeks of
a) How slowly the Vjet can fly
b) What a standard stall with the most efficient recovery I can perform looks like
c) What a deep stall with an aggravated recovery ( Leading to a departure and spin ) looks like
d) How to recover from this situation.
When I am teaching people on jets, I really try to focus on slow speed flight. I think it is one of the single most important, and overlooked aspects of jet flying. I have to admit in being a little lax in covering stall entry and recoveries.. I guess its something that I.... ( We all) could do well spending some time on. As these videos have shown, there is often not much time between entering a stall, and it all being over.
I am sorry for the loss of your viper, especially this one as I felt part of the construction process ( With the emails and Pm's
)