Thank you Roger - your stamina is impressive - thanks! ... I
start to get your point - Sorry it took so long. Coming from
Denmark, where the water is around 13 degrees Celcius these
days, this is a very important message to all sailers: Get
out and sail, and lock your propeller, so we soon can come
out swimming in warmer waters! ... ;-)) ... No Roger you
don't have to give me a lecture in how many sailors we need
in order to increase the temperature in the waters around
Denmark by ten degrees ... you have been very helpful so far
.... thank you!

--
Flemming Torp



"Roger Long" skrev i en meddelelse
...
Your intuition is wrong. You never loosen the grip, you
just change to a different kind of grip. Ever notice how
hot brakes get? That's because they are turning all that
energy into heat. When you let the prop go, it is still
restrained by the friction of the bearings and oil in the
transmission. They get warmer because they are turning
the energy being produced into heat. That gets reflected
in drag on the boat.

When the prop is locked, the shaft break, clutch, or
whatever is holding it doesn't get hotter. What gets
hotter is the water flowing past the blades. That energy
production gets reflected in drag on the boat as well but
there is less of it at normal sailing speeds and
freewheeling shaft rpm.

--

Roger Long



"Flemming Torp" fletopkanelbolle2rp.danmark wrote in
message
. ..


My intuition tells me that when you ' loosen the grip' on
the propeller shaft and let the propeller turn freely, it
reduces the drag on the boat. Right or wrong?

--
Flemming Torp