Propeller Functionality Comparision Table    …...          Saildrive Installations Only                                                                     































 ---------    RATING   BY  TYPE        0 = WORST   to     9 = BEST    FOR  EACH  FUNCTION   ----------


Functionality Required of Propeller Unit IMPORTANCE
Autoprop Fixed  Fixed  Folding Folding Kiwiprop Feathering Feathering SDC



0  to  9 = MOST 3 Bladed 2  Bladed 3 Bladed 2  Bladed 3 Bladed 3 Bladed 2 Bladed 3 Bladed 2 Bladed






















Motoring Speed at Cruise RPM 9
9 8 9 8 8 8 8 8 9


Reverse Thrust 9
9 8 9 1 0 9 8 9 9


Drag when Sailing - On and Off Wind 9
5 1 0 9 8 8 7 7 8


High Reverse Thrust @ Idle 6
9 8 9 0 0 9 8 9 9


Ease of Installation 4
7 9 9 0 0 9 0 0 7


Low Mass 5
0 7 5 1 0 9 2 0 9


User Variable Pitch - Ahead 4
0 0 0 0 0 9 9 9 9


User Variable Pitch - Astern 4
0 0 0 0 0 0 9 9 9


Low Moment of Inertia - Saildrive & Shaft 3
0 7 5 2 0 8 2 0 9


Minimal Corrosion Potential 8
0 0 0 0 0 8 0 0 9


Internally Lubricated 6
0 9 9 0 0 9 9 9 9


Blade Sacrifice in Catastrophe 3
0 0 0 0 0 9 0 0 9


Simple Blade replacement option 2
7 0 0 6 6 9 0 0 7


Initial Cost of Unit 6
0 9 8 5 4 5 2 0 6


Low Cost Blade Replacements 2
3 0 0 3 3 9 0 0 9






TOTALS:
246 346 331 222 195 568 354 333 618







Enter your own importance and results ratings to the above Excel table to recalculate the relative rankings  of the various units



In each case the ratings are assigned 0 for the worst case and 9 for the best case - they are relative ratings - not absolute









NB: The SDC Hybrid unit is the only type of the above that is not also available for shaft type installations ….















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