I'm curious about the gross weight on an experimental Rans S-7S. I noticed that on their website it is listed as the same as the certified light sport version, 1320 lbs. Is this correct for the experimental? I was under the impression that it could carry more than that.

All S-7S aircraft have the same gross. 1320. Some of the older non-s models have less.

Any idea if the 1320 lb limit is to keep it LSA, or is it based on strength of the airframe / engine power?

As a builder I suppose you can set almost any limit if you are willing to do the flight tests. I assume the Gross weight is a function of the LSA limit. It also will help with resale.
I would give the guys at Rans a call. They are more than willing to share info.

SamIntel:
The factory says 1320, so it's 1320. Does that mean it can't, won't, or hasn't carried aloft more? Of course not. They are a pretty conservative bunch there in Kansas, which I prefer in my airplane designer. VERY conservative on the performance claims in all regards (I think they list the stall at 45 while I fly around sub 30 all the time) and I'd imagine the gross weight calcs are similarly conservative. Good, I like that cushion and don't plan on testing it.

I see you're in Montana, stop by the Three Forks Fly-in this summer and let's go flying, there are some great gravel bars nearby.

Alright, thanks for the info guys.

courierguy,

If I am able to stay in Montana (I'm in Bozeman) this summer I will be at the Three Forks fly-in and will definitely take you up on that offer! I've recently been dreaming about having an S-7 or Cub to do just that kind of flying.