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Bridle tension system
Cylinder Sealing Strips

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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NOTE 2 The centerdeck station is a part of the control system in that it is a vital visual and communications link between the catapult officer and the control console. (The control system on CV-68 and subsequent carriers uses the ICCS and the central charging panel. This control system is discussed in more detail later in this chapter.) LAUNCHING ENGINE SYSTEM The components of the typical catapult launching engine system (fig. 4-3) are virtually the same on all catapults. The major difference is the total length of the launching cylinders, and, in the case of the C-13-2 catapult, the diameter of the launching cylinders (refer to table 4-1). As is shown in figure 4-3, the launching engine of a steam catapult consists of two rows of slotted launching (power) cylinders, cylinder covers, two sealing strips, two steam piston assemblies, a shuttle, two water brake cylinders, and the catapult trough covers. Associated with the launching engine are the digital endspeed indicator system, cylinder elongation and expansion indicators, and trough heaters. Launching Cylinders Each catapult has two rows of launching cylinders mounted parallel to each other in the catapult trough. They are made up in sections, with the number of sections determined by the overall length of the catapult. The cylinder sections are bolted together at their flanges (fig. 4-4) by means of long stud bolts, spacers, and nuts. Base pads are welded in the bottom of the catapult trough at specified intervals to match the bearing pads fastened to the cylinder bases. Shims are then used to properly align each cylinder section, and then the cylinder sections are secured to the trough base pads by bolts and clamps, which prevent the lateral movement of the cylinders while allowing smooth elongation of the cylinders due to thermal expansion. Lubricator fittings are provided for lubrication of the sliding surfaces. Figure 4-3.—Launching engine system (typical). 4-5







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