Originally Posted by FF
To cruise with lowest fuel burn for the miles traveled , the SQ RT of the LWL, times .9 to about 1.15 (depending on the boats hull and loading ) is the most common.
For many its about one K below theoretical "hull speed".
Thanks for this! Since I don't have a trawler, I would like to ask a question about this formula.
Say a trawler has a 36 foot LWL. The square root would be 6 feet. Times .9 to 1.15 would still be in the less than 6 to just over 6 range. Or about 6.
Would that speed be miles per hour? Knts per hour or some other measurement. I assume the variable of .9 to 1.15 would be hull design of semi-D hull versus full D hull. Or maybe weight or ??
Am I tracking at least some what correctly???