22 O. H. Oakley 
VELOCITY (KNOTS) 
10 100 8-47 / 
HELICOPTER 
—— 
COMMERCIAL AIRCRAFT 
100 
SPECIFIC POWER (HP/ton) 
° 
10 100 
Fig. 21. Specific power curves 
limit line. Of course, power per ton is not the only parameter; in the Spar Ship, for instance, 
this was considered of minor importance. Nevertheless, it does illustrate one facet of our 
high performance ships. 
This paper by no means covers all the possible high performance ships. Only some of 
high promise have been discussed and these with the caution that for every promise there 
arises a multitude of problems. 
DISCUSSION 
(Discussion of this paper is included with that of the following paper, by J. D. “ 
van Manen.) 
