Djungelman said..
What I would like to know is when you would prefer the short fuse with big stab option and when you would go for the longer stab with smaller stab for the same amount of stability and lift? I gues there is a difference in riding character but what is it?
As a try hard racer/speedster i'd put the larger stab into storage/not use it. The larger stab (on a short fuse) is a compromise between the two sometimes different worlds of lift/stability and control.
A shorter fuse tail = less leverage for the stab, which means when you get hit by a gust, its easier to overwhelm the sudden lift by shifting your weight. Trade off is you pitch up and down more.
longer fuse tail = more leverage for the stab, which means less pitching, steadier ride. Trade off is when you get hit by a gust sometimes you're just going to be along for the ride.
sticking a bigger stab on a shorter fuse gives you lift (from the larger surface area of the stab) but at the same time the shorter fuse gives you the ability to stay on top of the situation, because you can overwhelm the lift easier with weight shift. All of which is great for a free ride foiler
the reason i stick with the smaller stab (255) on each different size fuse is because on the shorter fuse im looking for the lift to to not start kicking in till at a higher speed. The longer fuse you need to use the smaller stab anyway, because the larger stab would just deliver too much lift (using the smaller stab is more about how much lift you get, not just drag reduction).
the longer fuse is generally for upwind/downwind sailing, where you can use that extra lift to get better angles. The shorter fuse is great for more cross breeze type sailing.