Kiwiprops™

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Voile Magazine Sun Odyssey 34.2 Volvo 2030

This analysis was published in Voile Magazine in April 2009  utilising a  Jeanneau Sun Odyssey 34.2  fitted with a 28 hp Volvo 2030 shaft  installation rated 3200 - 3600  max rpm.  Vessel specifications follow this table below:

NB:  THESE TESTS AND TABLES WERE PRIOR TO OGIVAL FOIL UPGRADE - ADD 0.3 TO 0.5 Knots TO ABOVE DATA FOR CURRENT PERFORMANCE COMPARISIONS.

Kiwiprop Performance at Cruise RPM:

Users are always interested in the motoring speed thay can expect with a Kiwiprop along with the other  features available. The following information was taken directly from the Voile Magazine report above  at  2000,  2500  &  3000 rpm which covers virtually all cruise rpm regimes  that the vast majority of users would operate within.

The left most colums are simply the data as reported. The next three columns take the same data and rank it by ascending vessel speed at those particular column heading rpm settings. Red indicates the unit was outside the minimum rpm required as indicated in the Voile report.

What it shows is the Kiwiprop on this installation was very highly ranked at all three cruise speeds relative to all other units that met warranty criteria. There is no reason why users cannot expect similar relative performance from their own installation bearing in mind the constraints in place for this evaluation.  Boats that have more displacement, shorter waterline lengths, greater wetted area, steeper shaft angles, less power or higher rpm shaft speeds will invariably have lower speeds than reported on this vessel.

Cruise Speeds vs Max RPM Achieved:

The following graph from the full report above shows by plotting speed at cruise rpm of 2200 on the Y-axis vs  the max rpm in descending order achieved by the engine on the X-axis - that there is a very strong correlation between lower max rpm and higher cruise speeds.  As we have stated previously - any comparision of propeller performance can only be made in the context of similar max rpm constraints.

New engines require that they reach a minimum max rpm to qualify for warranty. The Voile test results show in red the four units that did not meet these criteria.


This is the orginal article scanned in French:

 
This graph shows the motoring performance of the Kiwiprop vs the benchmark standard type Nakashima  fixed 3 bladed unit. NB:  AGAIN - PRIOR TO CURRENT OGIVAL FOIL MODFICATION
Sun Odyssey 34.2 Specifiations: