INTRODUCTION 
Major naval ships powered with marine gas turbines and using 
controllable-pitch (CP) propellers for thrust reversal are currently being 
added to the Fleet. Ships with CP propellers include the DD-963 Class, 
the FFG-7 Class, and the DDG-47 Class. 
Accordingly, the Navy has been conducting a research and development 
(R&D) program to establish the technology for producing reliable CP pro- 
pellers with delivered power in the range of 35,000 to 40,000 horsepower 
(26,000 to 30,000 Wee As part of this program, CP propellers were 
installed on the U.S.S. PATTERSON (FF-1061) and U.S.S. BARBEY (FF-1088) 
with delivered power of 35,000 horsepower (26,100 kW). These installations 
were intended to demonstrate that CP propellers in this range of power had 
adequate reliability for application to ships with gas turbine prime 
movers. 
Because of the structural failure of the crank rings to which the 
blades of the CP propeller on the FF-1088 were bolted, R&D efforts were 
intensified. The program undertaken at DINSRDC included: 
1. Blade Loading of CP Propellers 
a. Model measurement and theoretical prediction of blade load- 
ing on CP propellers. 
b. Model and full-scale wake measurements and theoretical pre- 
dictions of wake. 
c. Full-scale measurements of forces, pressures, and strains in 
CP propeller components. 
2. Structural Design of CP Propeller Blade Attachments. 
3. Development of Materials for CP Propeller Systems. 
The current report presents the results of work conducted under Sec- 
tion la of the CP Propeller Research and Development Program, i.e., model 
Theses silie J.J. et al, "U.S. Navy Controllable Pitch Propeller Programs," 
presented at a Joint Session of the Chesapeake Section of the Society of 
Naval Architects and Marine Engineers and the Flagship Section of the 
American Society of Naval Engineers, Bethesda, Maryland (19 April 1977). 
