ON line I have seen that ripstop nylon is used for many things. I had forgotten that it was used in spinnakers. It certainly took some hammering in the two spinnakers I used for racing. It is used for paragliders and no doubt can be bought in heavier weights than I have ever seen.
Ask the manufacturer for detaails of strength, porosity, stretch etc.
Nylon was a stretchy material, but the spinnaker material seemed to hold shape well, I wonder if the reinforcing material is also nylon.
Hi Frank I'd stick to what has been serving your drifter well over all your flying years. It could be worth asking your sail maker if they can do a set in the 'Xlam' fabric that Skyranger use its great although a little dearer that the Dacron ones. You will find discussion on the skyranger and other webb searches.
Kasper (and others) see my posts "A short story, then a long journey" An addition will be a foam infill so that I have something to press on and force the resin through the material. The resin is the actual skin, the material only an anchor.
Way way back in the early days of home building hang gliders we used rip stop nylon (we called it parka nylon) & it really stretched heaps. Of course then came dacron which didn't stretch and later mylar, kevlar etc. Cost increased as the products improved. I'd use dacron although more expensive than nylon it will outlast it by a long shot.
I imported a quantity of rip-stop fabric in the 80's to cover a project I was working on. A friend was about to re-cover his Jackaroo and asked to buy the material from me as I was a way down the track from needing it. It was heat shrinkable but never permanently tautened. It was always stretching and quite unsuitable. I don't know whether it has advanced but I would not try it. Don
Dacron/polyester may ONLY be plain weave BUT
1. It’s stretch in warp/weft are well known and VERY much less than nylon spinnaker fabric.
2. It’s cost in white in 4-5oz is equal or less then nylon ... colours are generally around 50% more than white unless you buy the entire roll
3. UV stability well known and very good
Sorry but if nylon was actually well suited to hard work you’d have seen them rolled out in the mainsails decades ago - it has not because higher load is not well handked by it due to stretch and deformation from the required cut and in aircraft use the limited stretch and retaining shape wins hands down.
Polyester wins unless you have the money for a laminate ... and even there laminated for yachts are often not well suited to aircraft because they have accepted increased cost and stability over UV life.
Trilam is a good laminate if you can get it ... and it’s polyester core with clear laminate overlay.
Not quite understanding there sorry, you have a leading edge with a total of 12oz dacron covering?
The reason I'm asking is I'm toying with an idea of making metal wings using perforated metal skins, 40 or 50% (the measurement for the amount of hole area, which of course is also the reduction in weight), and then covering it. I have zero knowldge of materials and covering experience.