Join Date: Feb 2008
Location: N. VA
Thanked 1 Time in 1 Post
Rep Power: 8
around .75 * max RPM ...
Over the years sailing OPBs, most folks ended up cruising at around 75% of max RPM or whatever got them to hull speed, whichever was lower.
My 30' Islander Bahama goes about 6.5 knots at 2700 RPM, which is 75% of my 2GMF's 3600 max RPM. My hull speed is 6.64 knots, so that's about right.
Those who do not know their hull speed should check out this Sailcalc page
. It shows you all kinds of interesting statistics about your brand, size, and model boat (assuming it is on the list). I have no idea how accurate it is overall, but it was pretty close when I spot-checked a couple of its statistics for my boat using the original formulae.
T. P. Donnelly
S/V Tranquility Base
1984 Islander 30 Bahama