And the PF community did a great job of discussing some of the physics and mathematics involved.In summary, the conversation centered around the vector equation ##\frac{|V_0 \times V_f|}{g} = R## and its lack of use and teaching in projectile motion. The article "Convenient Equations for Projectile Motion" from the American Journal of Physics was brought up as a useful resource for understanding and utilizing this equation. The AAPT was ultimately very supportive and allowed for the use of their material in the discussion on Physics Forums.
Thanks for your kind comment. AAPT (or their representatives) were very helpful - I think they were happy for a long-archived article in AJP to get some renewed attention. Certainly there was something of a process to be followed (as you would expect) but at the end of the day the permission granted was very generous in extent.