Question:
I now have my boat back from the shop where it was repowered with a
2000 310hp Merc & Bravo III drive. My buest guess at prop size was to
go with 24s. This turns out to be not enough prop as the motor runs up
to the rev limiter getting the boat on plane and can easily get up to
5000rpm. The boat is a 26' express cruiser with a dry weight of around
7000lbs.
If I remember right the rule of thumb for props, like on my bass boat,
is 200rpm for each inch in pitch. Does this hold true for dual prop
outdrives as well. If not is there a rule of thumb?
Second question is how feasable is swapping props in the water. I can
find shoreline that will allow me to stand behind the boat and have
access to the outdrive. I would also assume the standard prop wrench
isn't go be enough to get the first prop off. Any idea the wrench size
to get the front prop off.
(dock handling is soooooo much better with the BIII than my old BI)
Answer:
The old 200 rpm per inch of pitch does not hold true for counter rotating
props, and there is no rule of thumb estimates that are accurate. As for
the second question, hopefully someone with alittle experience in this area
will ne nice enough to post!
