Design Criterions for the Dimensions of the Forebody of a Long-Range Flying Boat
Abstract
A correlation is made of the gross-load coefficient and the forebody length-beam ratio for a limited number of present-day multiengine long-range flying boats for which the spray characteristics are known. The spray criterion and the derived relationships permit a choice of dimensions of the forebody for various degrees of seaworthiness and permit the evaluation of the relative effect of forebody length, beam, and length-beam ratio for a proposed design. It is concluded that the gross-load coefficient for comparable spray characteristics varies as the square of the forebody length-beam ratio. The forebody length has a relatively greater influence than the beam on the low-speed spray characteristics. When the length and the beam are both varied to maintain comparable sizes of forebody, the effect of length is not so pronounced as when length alone is varied. Large increases in length-beam ratio are required for comparable sizes of hull to obtain a definite improvement in the spray characteristics. Comparable spray characteristics may be obtained with a smaller forebody by use of high length-beam ratios.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1943
- Accession Number
- ADA801344
Entities
People
- John B. Parkinson
Organizations
- National Advisory Committee for Aeronautics