Se mueve la hélice si navegas a vela

[Kane]

La verdad es que en enlace que cita Paco son bastante expeditivos:
(Mi hélice siempre gira libre).

Propeller Drag Test Results

Jig Drag = 12 pounds with no prop mounted. Measured at WOT. (wide open throttle)

Locked Prop Drag: 45-50 pounds: 50 -12 = 38 pounds of actual propeller drag when locking the propeller in reverse under sail.

Freewheeling Prop Drag: 20-25 pounds: 25 - 12 = 13 pounds of actual propeller drag when freewheeling the propeller under sail.

The locked propeller drag is 2.92 times more drag or a 292% increase in drag over a freewheeling propeller when you remove the test jig from the equation!!!!

As I said earlier, the test results are not even close. There's no need to worry about the .001's or a few pounds of drag here or there or even the rather "unscientific" method I used in this test. If a sailor cares to find an additional knot of boat speed in light winds, he must free wheel his propeller under sail. (note: I picked an average wind day with flat water and tried my props both locked and free wheeling while under sail. I have two props on my catamaran, and Main Sail's test was verified on my boat (it wasn't even close) --Rick)

Despite the Yamar advisory, which voids their warrantee if you lock their transmissions while sailing and despite Volvo's recommendation that you sail while their transmission are in neutral and despite the MIT study, the University of Strathclyde Ocean Engineering white paper, the Yachting Monthly data and this webapge, which all basically show the same thing, that a fixed prop caused more drag, there are still a few die hard types arguing the helicopter blade theory.

I have never seen so much misinformation on a sailing subject as we get on this one. I recommend you read this page carefully yet again, and get this right. Unless your transmission specifically says to shift into reverse while sailing, all sailboat owners should be free wheeling their propellers while sailing. On second thougt, if they ignore this webpage, it will be great for our economy as they will have to buy new transmissions!

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Saludos,
Carlos
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