- Pat and Diane,
I suggest that you ask Amel about the correct pitch,alternatively you
could ask the makers of Maxprops.
I have an Autoprop and although it may be very efficient I have no
way of telling. What I do know is that it is essential to keep it
virtually spotless as even minor fouling causes it to go to too
coarse a pitch which overloads the engine and also reduces power. Bad
fouling can reduce boat speed to a couple of knots and engine speed
to about 1200 RPM.
It also very difficult to steer when the bowthruster is out of
action. It does not give the feeling of acceleration even if the
throttle is opened wide.
My last boat had a Maxprop and was very satisfactory and I wish that
my SM had one.
Incidentally recent messages referred to an expensive tool to release
the bearings on an Autoprop. I bought such a tool which was a
standard fitsall tool for working on items which need a tool with two
pins to insert in the fitting. It was quite useless which was
fortunate as I then found that grease has to be forced into the
centre of the fitting causing the old grease to come out of the
fitting. The nipple on the side of the fitting would not accept any
Best wishes, Anne and John SM319