- Joined
- Jan 9, 2014
- Messages
- 4,179
- Location
- USA
- Vessel Name
- N/A
- Vessel Make
- 1999 Mainship 350 Trawler
Something to consider is the theoretical hull speed of the vessel, which can vary greatly from vessel to vessel
√ LWL * 1.34 = Theoretical Hull Speed.
Part of the key is the LWL (Length at Waterline), not the vessel length (LOA). LWL is typically a few feet shorter than LOA. Model numbers are rarely close to either LOA or LWL.
In order to get a Hull Speed of 8kts you would need an LWL => 36 ft.
A 36 ft boat with an LWL of 33ft would have a theoretical hull speed of 7.69 kts. Exceeding hull speed increases fuel burn exponentially as it is increased.
Since nautical charts are in Nautical Miles, speed (including this calculation) is based on knots, not Kilometers and not Miles Per Hour.
Something to consider when doing real-world calculations.
√ LWL * 1.34 = Theoretical Hull Speed.
Part of the key is the LWL (Length at Waterline), not the vessel length (LOA). LWL is typically a few feet shorter than LOA. Model numbers are rarely close to either LOA or LWL.
In order to get a Hull Speed of 8kts you would need an LWL => 36 ft.
A 36 ft boat with an LWL of 33ft would have a theoretical hull speed of 7.69 kts. Exceeding hull speed increases fuel burn exponentially as it is increased.
Since nautical charts are in Nautical Miles, speed (including this calculation) is based on knots, not Kilometers and not Miles Per Hour.
Something to consider when doing real-world calculations.