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what Bulleid was aiming for with his chain drive valve gear was a fit and forget valve gear that could be entirely enclosed in an oil bath along with the conecting rod, crank and crosshead assembly for the middle cylinder. How it worked was a three throw crank shaft was connected by two quadraplex chains to the crank axle. The crank shaft had two links coming off each throw, one running vertically up to ossilate the expansion link and the other running forward to the bottom of the combination lever. The expansion link and the top of the combination leaver being connected by a short radius rod. The arranrangement formed a square with crankshaft at the bottom righ corner, expansion link top right corner and the combination link connecting the top left and bottom left corners. The best way to really explain it though is with a diagram. <br /> <br />Malcolm, IMHO the Merchat Navy's were much better looking before rebuilding that after.
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