How an aeroplane is built . of dampness or moisture thefabric may contain it will be contracted inarea, and however tight it may be stretchedand sewn on, it will relax and becomequite slack on coming in contact with thewarm, dry air of the dope room. It isfairly safe to say that no amount of dopingwill succeed in bringing up the tautness ofthe fabric as it is required for first-classwings, and the finished article will be adisappointment. PUTTING ON THE covering the wings it is usual to puton the covers over the leading edge. i84 HOW AN AEROPLANE IS BUILTStretch the cover over the to
How an aeroplane is built . of dampness or moisture thefabric may contain it will be contracted inarea, and however tight it may be stretchedand sewn on, it will relax and becomequite slack on coming in contact with thewarm, dry air of the dope room. It isfairly safe to say that no amount of dopingwill succeed in bringing up the tautness ofthe fabric as it is required for first-classwings, and the finished article will be adisappointment. PUTTING ON THE covering the wings it is usual to puton the covers over the leading edge. i84 HOW AN AEROPLANE IS BUILTStretch the cover over the top and bottomof the ribs, then stretch the fabric to thetrailing edge and tack down with a fewfine gimp pins. Sometimes this is donewith pins. The fabric should then bestretched lengthways and all seams straigh-tened from the front to the back. After which the two surplus ends of thefabric should be cut off, leaving only abouthalf an inch of each end to turn in andmake a seam. The sewing up of the seammay then be Fig. 34. The first stitch should be made by pass-ing the needle through the fabric from theinside, pulling it through and passing overthe edge, then across the gap to the fabricon the top of the wing. Here the needleis again passed from the inside of the fabricto the outside, and the stitches both drawntogether (see Fig. 34). This has the effectof neatly and tightly drawing together theends of the fabric. wing will now have to go throughthe process of stringing. This consists HOW AN AEROPLANE IS BUILT of putting a loop of string over the fabricand round each rib, and knotting andcarrying the end of the string about fourinches farther on and repeating the sameoperation. This is done to each rib, onwhich there will be about eight or nineloops. This is for the purpose of attaching thefabric to the ribs, preventing the fabricripping, and generally helping to distributethe load. The lines of string are after-wards covered with strips of fabric, with
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Keywords: ., bookcentury1900, bookdecade1910, bookidhowa, booksubjectairplanes
