Originally Posted by vinayfm
Actually a revolving prop applies more brake than one that is locked and capitate. In my humble opinion
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Then you opinion is wrong. This question has been debated ad nausium on sailing forums
, but the scientific debate is settled. The only real open question is how much additional drag is produced. This is a function of the specific prop in question, and boat speed, but the results are always the same. Allowing a prop to spin creates less drag.
NOTE: less drag is nice, but not destroying your transmission
is likely more important. So only allow your prop to spin if your transmission
allows for it.
The best study i have seen recently below. But it is in line with the rest of them.
"The experimental results confirm that a locked propeller
produces greater drag than does a freewheeling screw (up to 100% more drag was observed, this being at higher speeds). Furthermore, for the freewheeling case, the magnitude of the hydrodynamic resistance is significantly affected by the amount of frictional torque on the shaft, low torque being accompanied by low drag."