- Jul 27, 2011
The bottom does not have to be dirty to slow you down pulling a 150# to >200# dink + engine, etc. It can cost as much as a knot even under power. Under power you MIGHT be able to throttle up some to compensate. Not under sail. You’re stuck with it all day unless the wind picks up some; maybe. On a 60 n.mi. run, the difference between VMG of 6, instead of 7, kt is about 1 and a half hr. For 600 n.mi., the cost is an extra day’s run, etc.Nothing growing on the bottom of mine, and this is so for most folks around here.
One has to figure the “cost” in diesel-engine horse power (even if there is a generator running at times). Whenever the batteries are charging via the alternator some horse power is removed from thrust, etc. Running refrigeration?, autopilot?, radar?, navigation electronics?, charging cell phones? adds up throughout a day. In addition to that, the diesel has to push the boat and pull the dink, if under power, which will likely be a lot of the time if going down the ICW.