A friend had his AeroVee do the crankshaft break 2 summers ago, it broke where the lat Bob Hoover said they break. I have pictures I'll post when I find them.Like others I thought this was history. I know that years ago the Aerovee was having some prop departing concerns and the company came up with a different crank. I have read of at least one Aerovee crankshaft break recently with the new crank. Not sure what year the new cranks came out as this video is from 2013:
Corvairs were breaking cranks but the 5th bearing seems to have cured that. The other thing that I do (even though many say it's not required) is to index the prop. But it appears in the photos of the VW prop breaks that they are separating right behind the hub. I don't see how indexing would change any of that unless somehow balance or harmonics are affected.
The other thing learned on Corvairs is that the prop, fly wheel, and ring gear should be on the same end of the crank. If you load both ends of the shaft with weights then it's gonna undergo a lot of twisting.
But I'm the dunce in the group ...