Flutter of Flexible Hydrofoil Struts 



DISCUSSION 



Reuven Leopold 



U.S. Navy Naval Ship Engineering Center 

 Hyattsville 3 Maryland, U.S.A. 



Thank you, Mr. Besch. Besides the interesting paper we may- 

 congratulate you on finishing on time. The floor is open for discussion. 

 If no -one has a question ready, I guess I will fill in. I have an awful 

 lot of questions and I thought I would never get them in, but it looks 

 as though I shall. 



The tested configuration was designed as a cantilever beam. 

 The analysis assumed the same, hence fixed at one end. In an actual 

 design, fixity cannot be (or by design is not) achieved. For example 

 the strut serves as a rudder, or is supported by a flexible foundation. 

 How would this affect the flutter dominating mode shapes ? 



REPLY TO DISCUSSION 



Peter K. Besch 



Naval Ship Research and Development Center 

 Bethesda 3 Maryland, U.S.A. 



We can include motion of the hull and flexibility of the hull in 

 our analysis, but we have not done so in this paper. Our paper merely 

 consists of the analysis of existing results, and we admit that further 

 analysis would be required for full-scale applications. The analysis 

 requires further development in order to be able to treat model re- 

 sults successfully and these are firmly supported cantilever beams. 

 It must further be remembered that no full-scale data is available of 

 any type in this area, so further work must be done. 



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