I have made 5 very similar wood core scabbards, all 36" long to fit the same blade. My objective in making all of these cores for the same sword was to end up with one lined core for storage with good oiled cloth to blade contact, and an unlined core for more traditional presentation. Additionally, I wanted to experiment with lamination over the exterior of the wood core. I believe the combination of leather and wood construction could have resulted from rather poor historical performance of hide glue for permanently bonding wood to wood, while historical performance of hide (both from animal and fish skin) glue for bonding leather and sinew to wood was excellent (good enough to make laminated bows.) I do not have an interest in making my own glue from fish skin (is water proof and was done all over the world by 1000 AD) but felt that fibergloss cloth and epoxy would work well, and not be noticeable underneath a leather cover. After 5 trials, I had the two cores I was after with very good fit. This left me with 3 extra cores (too loose or too tight a fit to offer to someone else) that I chose to use for destructive tests.
Of the three "extra cores" one was a cloth lined core with about 1/8" thick poplar wood and two layers of epoxy fiberglass lamination. The two solid cores were about 1/4" thick wood (one walnut, and one poplar) and neither were laminated, simply glued with yellow carpenters wood glue after hollowing out of the halves. My simple test was to support the ends of the 36" long scabbards on two logs (Osage Orange sections left from a tentative bow project.) I stood on the center of the scabbards and judged how much of my weight they could bear. The two solid wood core scabbards were obviously going to fail under my weight, but my 50 lb (22 kg) son could stand on them with creaking and groaning sound of impending failure. If he jumped, the scabbards failed. The much thinner but laminated core bore my weight. I decided to test it for resilience and found that it made a pretty good trampoline. I got bold and had my wift take a picture since I was not sure anyone would believe this. I was attempting to spring very high into the air, when the laminated core made that little sound like paper tearing (nylon threads within the lamination tearing) and suddenly cracked.
My conclusion that I wished to share on this post is that using lamination over the core of a scabbard obviously increases strength significantly (at least in this one instance by more than a factor of 4.) We know that scabbards for katana's were sometimes laminated with shark or ray skin and fish glue. I would be logical that in wood/leather medieval scabbards, the leather was not just decorative, but an integral part of the scabbard structure.
Jared Smith

