RE: Hi-Start vs Winch - Area Needed ? ?
If a highstart has too much rubber for the launch length, it's going to deliver poorer launches. If you don't stretch the rubber enough, you're not going to get the power it's capable of providing. And it's weight is going to penalize with no reward. There will be excess rubber that's not pulling it's own weight.... pun intended.... and more importantly, not providing power. and there's an even greater probability the line lenght is excessive as well, since line length is proportional to rubber.
In a limited launch length problem, it'd be nice to have an adjustable highstart. (BTW, winches are perfectly adjustable and suit the problem perfectly.) It's actually quite easy to make your own adjustable highstart. In fact, you can make doubly adjustable ones, but more on that later.
Lengths of rubber hooked together work perfectly. Even when the rubber is different strengths, but more on that later. Anyway.... if the OP's available 'runway' is too short for his present highstart, all he's gotta do is adjust the length of the rubber and line. If I were him, I'd do some design work first. I'd figure out how long I wanted the rubber and cord to be first. Don't know where to start on that? Measure what your present highstart has at rest and stretched, and work from those proportions compared to how much 'stretch' your site has in it.
Putting connectors into the highstart system works perfectly. Putting them into the rubber part works just as well. You wind up with an adjustable system that can be tuned to different flying sites.
It worked in the old days. It'll work now. But for the OP..... don't bother if you can pull your present highstart to the max at your present site. or if you don't want to bother getting the max out of your highstart. If the latter is the case, I'd advise you invite somebody with a winch over to fly and see what it does.