A hull without chines has a gradually curving cross section. Multi chines are more complex to build but produce a more seaworthy hull form. The hull was a normal frame and longeron design with chines. Hull shapes are categorized by roundness/flatness, and by the presence and angle of chines. The hull is of a 'three plank' construction, that is with two chines. Designs with higher numbers of chines (D), often just called multichine hulls, are also common. Havells India owns some Chines brands like Havells, Lloyd, Crabtree, Standard Electric and Promptech. The Cajun "pirogue" is an example of a craft with hard chines. Raptor has chines along its nose section that align with its engine air intakes. The addition of chines also allowed the removal of the planned canard foreplanes. The "chines" were added after "Columbia" arrived at KSC in 1979. Cooling was carried out by cycling fuel behind the titanium surfaces in the chines. All chines are in a state of constant change due to erosion. Drums have top and (usually) bottom "chimes" or rims&colon; sometimes called "chines". These included requested modifications to the launch vehicle to add chines.