I do like Wittman's designs. Innovative, bare-bones, and efficient. Almost like they were designed by a racer Of the Buttercup, Wittman once said it was the only plane he designed that went faster than he thought it would.
FWIW @planecrazzzy, I do prefer the sharp, trapezoid tail on your BC. Are the tail feathers flat or airfoil?
I read an article that stated the wingtips reduce stall speed and increase cruise (at something like 9,000').
From what I gather the Tailwinds fly a like the AA-1A I am accustomed to. When I look at the differences between the Tailwind and Buttercup, I do lean more towards the Buttercup. From what I have read the BC has a shorter TO distance then the Tailwind. Since I like to FLY as opposed to go fast on the ground, that suits me quite well. The AA-1 takes a month of Sundays to get into the air.
Of course, someone took Wittman a step further [LINK]