[PUP] Unsailboat fuel consumption

[Dave Cooper]

I guess we must qualify as a "narrow boat" at 63' overall and 12'10" of
beam. At 92,000 lbs as weighed on the travel lift when we left the BVI I
guess we are "heavy & narrow". Our mileage wasn't spectacular at ~ 1.6nm
then again the seas and wind weren't too kind either ;-)

So I think you need to be long, narrow and "light" to achieve the higher
fuel numbers we see from the unsailboat and others who get or claim higher
NM/G. Perhaps a better metric is tons/waterline, aka length/displacement.
We're 52' WL so we're .88 tons/ft.

Mark, I expect is 42' on the waterline at 16 tons. This is .38 or so tons/ft
The unsailboat is 80' waterline and if memory serves me about 30 tons all
up. I may be wrong on this please correct me if you know what it actually
weighs. If correct then she's .37 tons/ft. Again very light, IMO.

So maybe we can compile a list here from real numbers that we know from our
own performance of our boats. I could be a bit eye opening as I think it is
the weight i.e. tons/ft, not the beam that uses the fuel ;-)

YMMV
Cheers

Dave & Nancy
Swan Song
1974 Roughwater 58
Caribbean Cruise 2006