Forces on an A.C.V. Executing an Unsteady Motion 



VI. 2. Future "Work 



It would be interesting to verify some of the above-mention- 

 ed theoretical results by experiment. In particular, one would like to 

 know how accurately the induced side force is predicted - or what the 

 equivalent smoothing would be. Such an experiment would have to 

 take into account aerodynamic and momentum side forces as well as 

 skirt contact, which might be significant. 



Numerical work can be extended in various areas. Further 

 test cases, including the effect of finite depth might be examined. 

 Incidentally, many manoeuvers are carried out in finite depth near 

 the terminals. This aspect is therefore important. 



Possibilities for theoretical work include an investigation 

 into the yawing moment acting on the vehicle about the vertical axis. 

 Some experiments by Everest indicated that the craft is generally 

 stable in yaw. 



ACKNOWLEDGEMENTS 



The writer is grateful to the Office of Naval Research, 

 Washington for their support of part of this work under Contract No. 

 N00014-67-A-0181-0018 Task No. NR 062-420, which was carried 

 out during 1969 and 1970 in the Department of Naval Architecture 

 and Marine Engineering at the University of Michigan in Ann Arbor, 

 Michigan. This work is briefly covered in the section on Rectilinear 

 Motion in Horizontally Unrestricted Water. For a more detailed 

 account, the reader is referred to Doctors and Sharma (1970 and 

 1972). 



The Section on Rectilinear Motion in a Tank represents some 

 calculations performed for research supported by the Australian 

 Research Grants Committee during 19 72. 



The writer also wishes to acknowledge valuable suggestions 

 pertaining to this paper made by Professor P. T. Fink, Dean of the 

 Faculty of Engineering at the University of New South Wales in 

 Sydney. 



59 



