3 ms·
Especially if you buy your material because it is past shelf lofe, don't use an autoclav and forgoe curing. Fun experiment: Take a roll from some toilet paper,
by hef19898 3y ago
Especially if you buy your material because it is past shelf lofe, don't use an autoclav and forgoe curing.
Fun experiment: Take a roll from some toilet paper, squeeze it somewhat evenly at the ends. It is kond of stable. Then peel the layers apart, ans squeeze again. The same would happen if the composite tube delaminated at one of the end cap rings. This whole thing is beyond infuriating.
- SV_BubbleTime 3y ago> don't use an autoclav and forgoe curing. I haven’t read that. But, that’s not an option. Carbon won’t just cure on its own, ever. It will be a shitty sticky mess forever. It had to be cured somehow. As to the carbon expiration. I don’t know what that was. I suspect it could be epoxy like in prepreg, but I doubt prepreg here. And it could be shelf life of the carbon itself as it can be hydrophilic in some cases.
- buildsjets 3y agoAllegedly, they bought expired (out of freezer time) prepreg from Boeing Surplus. Boeing has released a statement that they have no records of this, so it likely passed through a third party before he acquired it.
- hef19898 3y agoFrom what I fpund, which admittedly wasn' a lot, the used pre-preg for the spining of the hull. Judgeing from the video, the environment wasn't too clean neither. Then they put all 480 layers for some hours into an oven at 160 (?) degree celsius. Thats it... Not testing afterwards, no aditional curing, no temp control during winding of the pre-preg (that is tricky enough already under ideal circumstances, 480 layers, the resin will be basically hardened, well dried, before the last layer is applied).