That’s pretty thin. I’d say that the arrows flex every time you shoot them. This produces tiny stress fractures which are exacerbated by very mild exposure to air (a type of corrosion); whereas carbon is inert on exposure to the elements. Yep it does fracture but it depends on how it’s laid. Meanwhile the aluminium core is protected. Why don’t full aluminium arrows do the same? They are thick enough that very mild surface fractures don’t run deep enough.
One advantage of having the ali on the outside is that the arrows are much easier to pull. Another is that they don't splinter like carbons and conventional ACs do (or at least the splinters are contained). I see what you mean about the ali probably being thin though.
A carbon outer over an aluminium core does seem more logical to me. I suspect the 7075 (a decent grade) aluminium on the FMJs is thin and possibly gets brittle over time. I’ve had two aluminium bike frames fail on me in the past; stress fractures.
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