Development of a Safer Jon Boat. Volume II.
Abstract
Conventional jon boats have stability and operational characteristics which make them inherently less safe than other recreational boats. Four boats are studied to determine static and dynamic stability, underway stability, and speed under power. Results are quantified by tests performed in a test tank and in the water. Test procedures used are presented in an appendix. Modifications are attempted to improve the stability and handling of two of the boats. These modifications consist of bilge keels to damp out rolling and foam pontoons to improve powering characteristics by altering the bottom shape. Results of these tests were used to design a second generation safe jon boat. This design incorporated floodable aluminum pontoons, open at the stern, providing the desirable bottom shape for planing with considerable improvement in transverse stability at rest due to the entrapped mass of water. The design is judge to not greatly increase cost or weight, keeping both these factors to less than 20% increase, and does not degrade any of the other desirable qualities of jon boats. Six hundred feet of documentary film clips are available from the Coast Guard R and D Center as a visual supplement to this report. A written narrative is included as Appendix C to this report. Volume I contains the results of performance tests of designs developed in this work plus additional designs developed elsewhere that were intended to meet the same criteria. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1975
- Accession Number
- ADA021081
Entities
People
- Peter M. Secrest
Organizations
- [Means, goals and clinical aims of physioradiological methods of examination.]