I have a 90 rigger with vertical sides on the front & back sponsons with flat plane bottoms....turns on a dime at high speed with no problems. Goodbye angled chines!
You might want to do vertical sides, but the lower outside edge of the sponson can be a non trip. Only a small section like 1/2" wide, so the sponson width for example is 3-1/2" but the actual riding width is 3-1/8"
So fast cat I posted a thread below this one, what are your thoughts about having tops of sponsons parallel to waterline or not? And how does that relate to changing the planing angle or AOA
Aaron....I have tried flat tops... angled tops & have not noticed NOTHING in performance...I only angle the tops for looks. Things I have noticed was AOA on the bottom of sponsons & the CG.