Nowaeckt and Sharma 
Il. "GENERAL APPROACH 
The originality of the present study lies not in the develop- 
ment of a novel method but in the concerted application of miscella- 
neous existing analytical, computational and experimental techniques 
to our specific purpose. Since these numerous tools have to be appli- 
ed in a rather intricate sequence to get the information desired, it 
seems necessary in the interest of clarity to precede the account of 
work done by a brief schematic description of our general approach. 
The internal details of the individual techniques are only of indirect 
interest in the present context and will therefore be banished to appro- 
priate appendices. 
The basic aim is to determine for a given hull-propeller sys- 
tem the propulsion factors and their potential, viscous and wave com- 
ponents by all feasible analytical and experimental means, This dic- 
tates roughly the following set of operations. 
First, a considerable amount of basic information can be ga- 
thered by a number of independent experiments and theoretical calcu- 
lations which may be executed in any convenient sequence. On the ex- 
perimental side we may deploy the following more or less routine mo- 
del tests in the towing tank : 
E1) Hull resistance test, 
E2) Propeller open water test (at deep and shallow submer- 
gence), 
E 3) Self-propulsion test with hull and propeller, 
E4) Nominal wake measurements behind the hull in forward 
and reverse motion, and 
E5) Wave profile measurements (e.g. longitudinal cuts) for 
the hull with and without propeller. 
On the theoretical side only few calculations can be perform- 
ed without resort to some empirical data ; these are : 
T1) Wavemaking resistance of the hull, 
T2) Wave wake induced by the hull in the propeller plane 
(both in forward and reverse motion), and 
T3) Potential wake induced by the hull in the propeller plane. 
1848 
