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Is that a real project? It still surprises me that in the years since the zipp vumachrono we haven't had anything much happening in the aero crankset world. I think there is a gap in the market for some very thin metal cranks to fit in a powermeter spider.
specialist-
Is that a real project?
No, it's just CAD practice. Since the VumaChrono we've had Vision Metron and Campag Bora/Bullet, neither of which has exactly flown off the shelves, plus the Look Zed track crank.
Within the constraints of pedal axle support and chain clearance on 11-speed bikes, there isn't really a good reason to try to make skinny cranks. If you go too thin you lose stiffness fast, the limiting load is torsion and to a first order approximation that's proportional to the fourth power of the minor axis. 15mm thick is where we are now, if you went to 12mm you'd have to double the major axis and then you'd be at >6:1 chord:thickness and the UCI would start moaning
gbj_tester
If that hits first, you can mill bits off it. Eventually you get to the point where your pedal axle is poking out of the back of the crank. I'd like to do shorter threads, I think large diameter (like FC-7300/PD-7300 but without the bearing-in-crank thing) would keep the stress within reasonable bounds with a 10mm thread engagement, which is about 4mm less than we use with 9/16×20, so 125mm Q looks feasible. Custom pedal axles and custom cranks - only rich people need apply :-)