hmm... i think it will depend on the power, a RN with 1200cc motor might do it? but a XFT with a 865cc might do it too. The question would be, given 1000cc, what is the heaviest ski that can backflip flatwater. That is just more specific. I guess we can almost say a 750sxi and 800SXR probably aren't the ones that would be doin it. If anything, its going to be the aftermarket hulls, REV, XFT, etc. Again, someone can maybe chime in if a RN has done it with enough power w/ a 'new lighter hood' and things like that. A stock RN vs a RN with a lighter hood, etc can make a difference too.