Outboard Waterjet Propulsion Development

The project is currently on schedule. The design review meeting was held on 08/26/97 at the Coastal Systems Station in Panama City, Florida. The mechanical arrangement, performance analysis and design features were presented at the review meeting. A number of suggestions and recommendations from the participants were noted for future guidance of the project. A meeting on 27 August was held at the 2CI facility to plan the continuing engineering and design efforts by 2CI and Vehicle Technology. Some of the significant data presented is attached herewith: Attachment A: NBOE Specification Comparison. This list shows that the proposed outboard waterjet should be able to meet the specification. Attachment B: This diagram shows the general arrangement, with engine cover removed, of the outboard waterjet. Attachment C: This diagram provides the major dimensions of the current design layout. Attachment D: This shows the arrangement of the mainshaft assembly with impeller and pulley. This assembly is driven from the engine by means of a HTD toothed belt. Attachment E: This shows the weight analysis. Jet weights were mainly proportioned from actual scale weights of a similar, but larger, jet. The engine weight was an actual scale weight of the current version of the engine. Attachment F: This shows the estimated resistance curve for the hull based on tests of a similar size hull (no test data was available for the current hull). Thrust curves for the jet are given for 55 horsepower (the power necessary for this application) and at 70 horsepower, the normal rating of this engine. Production dynamometer results for this engine average about 73 horsepower.