Fuel range figures are based on so many assumptions that it is always hard
to extract apples to apples comparisons from the vendors.
Both of the boats you mention, the N55 and the KK 55 appear to be publishing
similar ranges with large differences in tankage. Hmmmmmm.
We view range as a variable based on distance speed and days out. For
example we have zero range at zero knots if we are anchored for 180 days or
so because the genset will burn all the fuel!
So we know that we need fuel a minimum of every six months. If we add some
passages into the mix the time between fuel stops goes down but he range
goes up.
Burning 4 GPH at 7.6 or so would give us about 2300 miles, however it would
take us 13 days to do so non stop. There by we used another 100 gallons with
the genset so we are roughly 200 miles shy of the 2300. Lets say 2000 miles.
This means we have a range between 0 and 2000 miles depending upon the mix
of passages vs. anchorages.
I'll bet those marketing Nordhavn and Kadey Krogen folks are capable of
spinning the "assumptions" and coming up with very different "ranges" that
each product is capable of. In reality you as the owner are the only one
that can determine this. There isn't some magic range boosting hull that
runs of the hall effect spun from the hair of mermaids. Similar hulls of
similar weight, beam, wl, windage and power have very similar fuel burns at
the same displacement speeds.
As always YMMV and usually does.....
Dave & Nancy
Swan Song
Roughwater 58
Fuel range figures are based on so many assumptions that it is always hard
to extract apples to apples comparisons from the vendors.
Both of the boats you mention, the N55 and the KK 55 appear to be publishing
similar ranges with large differences in tankage. Hmmmmmm.
We view range as a variable based on distance speed and days out. For
example we have zero range at zero knots if we are anchored for 180 days or
so because the genset will burn all the fuel!
So we know that we need fuel a minimum of every six months. If we add some
passages into the mix the time between fuel stops goes down but he range
goes up.
Burning 4 GPH at 7.6 or so would give us about 2300 miles, however it would
take us 13 days to do so non stop. There by we used another 100 gallons with
the genset so we are roughly 200 miles shy of the 2300. Lets say 2000 miles.
This means we have a range between 0 and 2000 miles depending upon the mix
of passages vs. anchorages.
I'll bet those marketing Nordhavn and Kadey Krogen folks are capable of
spinning the "assumptions" and coming up with very different "ranges" that
each product is capable of. In reality you as the owner are the only one
that can determine this. There isn't some magic range boosting hull that
runs of the hall effect spun from the hair of mermaids. Similar hulls of
similar weight, beam, wl, windage and power have very similar fuel burns at
the same displacement speeds.
As always YMMV and usually does.....
Dave & Nancy
Swan Song
Roughwater 58
