Windsor Body 3-D boat-tail research
 

Here's a link to Jeff Howell et al.'s research at Loughborough University.
It's really good science, and they're getting closer and closer to the more complicated, compound-surface tails, which may come later as follow on research.https://www.mdpi.com/2311-5521/8/2/59

i read it yesterday .bunch usefull information about boattails