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Ah right, makes sense. Not having to bag it would have been enough of a reason for me.
M40J is a mostly outdated fibre
This made me laugh, by the way. A year ago this was our high-end fibre, only used on special occasions. But then again, you lot probably spend more on a single wing element than a student team on their entire car.
Tijmen-
We’ve got a couple of generations of fibre newer than M40J. M46J pretty much superseded it, which is a general purpose stiff fibre, but there’s a whole new generation of fibres coming through that offer higher strength as well as the high stiffness. These are replacing those older-style fibres where you had a choice of high strength, high modulus, or somewhere in between but not both.
Jonny69
It’s easier to cut (main reason) and it’s better in compression and shear than Nomex. You’d usually use Nomex on thinner gaps. I shaved a thicker bit down to the correct thickness. Bonding it in is no different as I’ve used what I believe is the strongest 2-part epoxy adhesive available. We’ve got stronger adhesive films which are lighter, but I’d have to tape it all up and vac bag it, whereas with this I can just spread it on and weight it down on the surface table overnight. I forgot to take a pic before I put it together!