Fig. 3. Scaling of bell geometry with bell height. Shoulder height
(hs/h) and fineness
(r0/h) ratios are plotted on the left-hand
vertical axis, while the wall thickness ratio (
/h) is plotted on
the right-hand axis. Shoulder height and fineness ratios decrease with
increasing bell height. The slopes of both lines were significantly different
from zero (P<0.05 for both). The wall thickness ratio did not
scale with bell height.