Audrey (aka Skipper) has sewn for decades, and she has five different sewing machines that she uses for various projects. A few years back, when we decided to sew our own sails and boat covers, she knew she would need a machine suited for working with thicker fabric and heavier thread. On the recommendation of a sailor friend, we bought a Sailrite Ultrafeed LSZ-1 walking-foot sewing machine and have ever since been very pleased with its performance. The LSZ-1 does both straight stitching and zigzag, which is used in sailmaking and repair; the Ultrafeed also comes in a straight-stitch-only model, the LS-1.
Both models have a walking foot, which pulls the top of the fabric at the same time as the feed dog pulls the bottom, ensuring even stitching and fabric alignment. This is a marked advantage over an ordinary sewing machine where only the bottom layer of fabric is pulled by the teeth of the feed dog. That may be fine for sewing a few layers of common fabrics, but not for sewing sails or boat covers where the fabrics are slippery or so thick that the top layers don’t keep up with those on the bottom. The walking foot also reduces the amount of seam tape or the number of fabric clips or pins required to hold the fabric together but gum up machines and slow sewing.
The walking foot has two parts: an inner presser foot that holds the fabric pieces in place while the needle stitches them, and an outer presser foot with two rows of teeth that grip the fabric directly above the feed dog’s teeth, pulling the fabric ahead up to 6mm when the needle is above them. The inner walking foot alternates with the outer walking foot and presses down on the fabric, compressing the layers so the stitch is tight, and holding the fabric against the needle plate until after the needle has withdrawn and the outer pressure foot has descended. A larger-than-usual opening in the needle plate reduces needle strikes and allows for a 5mm-wide zigzag stitch on the LSZ-1. The long and wide zigzag stitch is important for sailmaking as it can move with the cloth as the sail stretches in strong wind.
The Ultrafeed has a needle bar stroke of 1-11/32″ (34mm), twice that of some home sewing machines, and 3/8″ clearance between the raised walking foot and the needle plate, also twice that of a home machine, and can sew almost anything that fits in that space. It can sew multiple layers of heavyweight fabric, leather, or canvas, which is essential when stitching corners where fabric gets folded for overlapping seams or reinforcing layers are added in places such as the corners of sails. We’ve tested the Ultrafeed on 16 layers of canvas, as much as we could fit under the presser foot, and had no trouble sewing it.
Many industrial sewing machines are equipped with a walking foot, but the Ultrafeed machines are affordable and find just the right balance of power, reliability, precision sewing, and portability for working multiple layers of a wide range of fabrics. A lightweight home machine’s motor and presser foot can be quickly overwhelmed, while industrial machines may be too heavy and too fast to do intricate work. The Ultrafeed’s walking foot is the perfect size feed for sewing seams in sailcloth and it has adjustable tension for the presser foot, thread, and bobbin to handle jobs from 0.75-oz spinnaker fabric up to several layers of 20-oz Sunbrella or leather. The 49-lb machine has a good weight that holds it steady when working with heavy fabric, is easy to thread and to wind bobbins, sews uniform stitches, is fast, smooth and quiet, and can handle the thickest jobs you’ll encounter sewing sails and outdoor equipment. If one machine that does just straight and zigzag can handle all of your sewing tasks, the Ultrafeed LSZ-1, with its adjustments for presser foot, thread and bobbin tension, will do light sewing for household chores as well as the heavy work for boat-related projects.
The Ultrafeed cost more than our other machines, but it quickly paid for itself after we made a sail for our Penobscot 14 skiff, repaired several sails, and constructed three boat covers. Cost sharing may be an option for small clubs like TSCA chapters or groups of like-minded do-it-yourselfers. Skipper isn’t one who would use a feather or a frying pan to pound a nail, and she found the Ultrafeed LSZ-1 is just the right tool for our small-boat sewing projects.
Audrey and Kent mess about in small boats in the bays and rivers of northwest Florida. Their adventures are logged at their blog, Small Boat Restoration.
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