FRP, thanks for the McKee suggestion.

I have a 8' prone board redone as a McKee 4+1. Before this, the board was a blue and white thruster with an overly wide tail. Tail block was added later after I missed a long-distance session due to a smashed tail with exposed EPS.

Is it true that McKee setups need 'juice' to come alive?

Biggreen, the math on the 116*11/72 is 17 3/4" and 116*4/72 is 6 1/2", so very much in the ballpark. Thanks for the formula!

The board is for my daughter for flat water messing around and as a collaborative artwork project...but I thought with side fins and a little extra volume 'Pappi' could take it out on small waves.