I ran a 15x4W on my TT61 2C. It was okay, experimented it on my Harrier 90. A 13x4W is very little prop for the 61 2C for 3D, maybe a 14x4W as a minimum.

On another note, it is not worth it to fly the Twist with a 61 2C. The extra weight of the engine will increase the wing loading by heck of a lot. The increase in weight is more than the increase in performance. I tried this combo on quite a new planes. Best engine is something like the Twist is a SA82 turning a 14x4W.