The Nacra F18 and now the Nacra 20s share a very similar trampoline design now with fat rounded head bolts spaced slightly above the hull on which the trampoline is laced to. I really like it because, like someone said, it gives a great spot to push off from and it also gives a great handhold when you need it.

It's probably a development that came about because someone somewhere won a race with something like it. However, it does allow for a more cost effective and reliable method by which to attach the trampoline to the hull.