Look at the 90deg winding direction here:
https://youtu.be/4dka29FSZac?t=231Almost no longitudinal strength, if they really never put any lengthwise fibers in there, those fools.
Unidirectional carbon fiber strength, along fiber: 3'430 MPa
Unidirectional carbon fiber strength, 90deg to fiber direction: 96 MPa
https://www.luzi-2.ch/material/faser-kennwerteAccording to Barlow formula, you need 2x strength in radial direction and 1x strength in longitudinal direction
https://en.wikipedia.org/wiki/Barlow%27s_formulaResult from that winding machine, 38x strength in radial direction, 1x strength in longitudinal direction.
That thing folds like a coke can, looooong long before radial strenght has reached it limits.
The only reason why it didn't fold at 3000m when he went solo is that they apparently used something like 5inches of carbon, i.e. totally over engineered, but without any brains.
Right approach would have been using carbon fiber sheets with fibers in 2/1 ratio in radial/longitudinal direction.
But using a stupid lathe and winding tons of carbon rowing @ 90deg is so much more simple and lazy.....
My bets is that this deathtrap simply imploded, because of dumb engineering.