Three-wheelers are another beast. They don't bend the blades double, so even though the wheels are smaller, won't have as much hardening effect. The big throat is the reason they still exist. Patternmakers used them a lot, but most every pure woodworking shop featured the 20-24" double wheel saw when I was a pup. Three-wheelers didn't resaw, but they could make patterns for molds of pretty good size, as long as they were no more than 4 inches thick.