A high structural rigidity with low stresses and high stiffness is
important for low speed engines. The RTA84C and RTA96C designs
exploit a well proven structure with a ‘gondola’ type bedplate
surmounted by very rigid A-shaped double-walled columns and cylinder
blocks, all secured by pre-tensioned vertical tie rods. Both bedplate
and columns are welded fabrications designed for minimum machining.
The cylinder jacket is assembled from individual cast iron cylinder
blocks bolted together to form a rigid whole. The fuel pumps are
carried on supports on one side of the column and the scavenge air
receiver on the other side of the cylinder jacket.