The hull-form to be chosen had to enclose all spaces that have been described or listed. Since the _Savannah_ is known to have sailed quite fast for her length, her lines had to equal those of the _Ohio_; however, her smaller size and other factors indicated a somewhat different hull-form, with harder turn of the bilge and a little less deadrise. Due to the position of the machinery, the effect of its weight and that of the necessary fuel had to be considered. The midsection, or cross section of greatest area, would have to have been only a little abaft the paddle wheel axle to allow proper trim with a minimum of ballast. It was found by this criterion that the midsection of the reconstructed hull was located in proportion to length in a comparable manner to that of the _Ohio_. The run could have been made about as long and easy, in proportion, as that of the _Ohio_; likewise, the entrance could have been equally well designed for sailing. Probably a little ballast--stone, gravel, sand or pig iron--was required under the temporary flooring of the cargo holds, most of it abaft the mainmast. Some ballast would normally have been placed under the cabin stores, in the run. The boilers, engine, and fuel weights were relatively important. To trim the ship, with minimum ballast, the location of the machinery weights would have to have been about as shown in the reconstruction drawings. It may be observed that the engine and fuel weights are relatively great for the recorded hull dimensions and resultant displacement limitation, indicating only a small quantity of ballast would have been employed under any circumstance. Using the _Ohio_ as a guide, the midsection was formed to comply with the dimensions of the boilers and with due regard to the small dimensions of the _Savannah_. The result was a section having very moderate rise of straight floor, carried farther out in proportion to beam than in the _Ohio_, but with rather easy turn of the bilge and moderate tumble-home in the upper topsides. This section has a form found in plans of some American freighting ships of 1815-1830, but with slightly slacker bilge. The stern used in the reconstruction was the "square stern and round tuck" seen in the _Ohio_ and referred to in the _Savannah's_ register. Collins' "round stern," shown in Hudson's drawing, did not come into use in America until about 1824, and then in naval ships only, so far as existing plans of American vessels show. [Illustration: Figure 6.--Reconstruction of the hull lines and general arrangement of the _Savannah_.]