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Recently I asked a question here about the nature of the lightweight Royalex that was used in the Eclipse. The "final answer", provided by a few p-netters and verified by the info in some old Mad River catalogs, turned out to be that this type of lightweight Royalex is exactly the same in all respects to regular Royalex, except that it is thinner than the Royalex used in other Mad River boats. Thus there should be no tendency to get scratched more easily than "regular" Royalex since the outer layer is the same material in either case. However, to my eye, regular Royalex is anything BUT scratch resistant.
I might add that I've been paddling an Eclipse quite a bit so far this year. It's been a while since I've paddled a Royalex tandem, and I'd nearly forgotten how flexible they are in the bottom. Were it not for the V-shape of the hull, the crosswise curvature would disappear or even reverse itself when carrying a person at each end but no really heavy cargo on the floor in-between them. Not everyone who sees this flexing actually "sees" it, but I'm fussy and I notice such things. Looking at puddled water on the floor makes the nature of that flexing pretty obvious too. I don't consider it very fast at all, but then, my paddling partner isn't really strong. This boat has, by far, the fattest and bluntest entry at the bow of any canoe I've ever seen (except for some whitewater boats), which shouldn't contribute to speed. I like it though. I'd call it a pretty average general-purpose boat, and have enjoyed using it a lot.