F. H. Todd 
SURFACE TANKERS ARE DESIGNEO 
FOR A SPEED GIVEN BY 
z =2 (1-06 - Cg) 
CIRCULAR SECTION SUBMARINE 
TANKERS USING DEADWEIGHT — 
DISPLACE MENT RATIOS FROM 
{50,000 
D.H.P. 
100,000 
$0,000 
[~) 
Vv IN KNOTS 
Fig. 11. Comparison of surface and submarine tankers of 93,750 
tons deadweight 
