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| | e pitch feature of up to 3 inches. In the future the propellers for boats will have a ' of the blades when in operation. Interceptor propellers are geometrically | |
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| | The Interceptor™ design is an adjustable protrusion on the trailing edge of the pressure face of the boat blade to produce a surface discontinuity. The protrusion is arranged with an included angle equal to or less than 90 degrees which causes a"wedge" of circulating fluid to be captured. This "wedge" of fluid induces a local increase in lift for boat in this region of the foil section, without the associated frictional drag associated with alternative foil sections. Furthermore the effective pitch of the blade foil section is dependant on the relative height of the interceptor strip. The ability to adjust the relative height of the protrusion via interchangeable strips allows the "effective pitch" of the propeller to be adjusted to marine suit the specific application the propeller operates in. | |
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| | | The Interceptor solves the pitch problem by machining a recess into the trailing edge of each propellor blade. Strips of a specialised polymer are manufactured to fit and lock into the recesses. The top of each insert sits proud of the trailing edge of the propeller blade and creates the interceptor, effectively altering the pitch of the propeller. The ideal pitch can then be calculated using VEEM's interactive website and the pitch adjusted using a set of inserts of equal height. The insert heights range from 0 to 3 mm. When a change in pitch is required a set of inserts of a different height can be used, eliminating the need to either change to a new propeller or mechanically alter the existing one. | |
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