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Aviation History
1918
1918 - 0966.PDF
unusual, and the double inlet and outlet water connectionsbetween each pair of cylinders are of new design. The forma- tion of these twin water connections is clearly shown in thedetail sketch of the cylinder head (Fig. 9). together with the water passages cast round the sparking plug bosses ; the latterare somewhat inaccessibly situated in the space between the two cylinder headwater joints. The two semicircular bosseswhich are cast on the sides of the cylinder water joints are provided for the attachment of the two carburettors, whichare fixed to the front and rear cylinders by long studs screwed into these bosses in the water joints. To allow for the inter-changeability of the cylinders, these holes are drilled in even- cylinder ; when the cylinder is not assembled at the front orrear, they are plugged with brass grub screws as shown in the sketch. An interesting point of design in these cylinders lies in thefact that no water connections between the cylinders are made other than the twin head-joints referred to. This principleis similar to that used in the cylinders of the Zeppelin-May- bach engines ; these were provided with one large water joint,5 in. diameter, between each pair of water jackets, which was an extension of the cast-iron head. The cylinder barrelswere also of cast-iron, and were fitted with two inlet and three exhaust valves per cylinder. The exhaust valve pockets are provided with an additionalwater passage above the exhaust port, and cast so as to give a free water space completely round the centre portionof each exhaust valve-stem guide. The valve guides cast in the cylinder heads are fitted withcast-iron bushes pressed into position. The exhaust bushes do not extend the full length of the guides as the inlet do,but are kept back a distance of 10 mm. from the bottom of the guide, so that they are protected from the hot gases. AUGUST 29, 1918. As a further precaution against seizing, the diameter of thebottom of the exhaust bush is slightly reduced so that the bush has room to expand. >• \M' > 1 J I Fig. 6.—Cylinder, complete. Fig. 7.—Cross-section of cylinder throughinlet and exhaust valves, and section of cylinder barrel and water jacket on cylindercentral axis. Fig. 8. —Details ofcylinder head and water jacket screwedjoints. 964 Fig. 9.—Sketch of Cylinder head, showing water passages and connections.
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