Because what you don't burn in the Polar High calms will go to heat the boat.
Most cruisers at the 40 foot level and the "Bendytoy" type carry between 35 and 60 gallons of diesel
, because they are rarely more than the 150-300 NM range from a diesel
pump this gives them. Of course, many coastal/weekender cruisers will have difficulty burning one tank a season...I know I have trouble running 11 gallons in an Atomic 4.
By contrast, I am extending my fuel
capacity to 140 gallons in three tanks
: two 50 gallon keel tanks
and a third, 40 gallon, post-filter-system "day" tank under the new engine
, which itself will likely provide a range of approximately 1,100 NM (or halfway across the Atlantic going from St. John's to Bristol!) at a conservative 4.5-5 knots speed.
This reasoning is two-fold. On a trip from Panama
to the Marquesas
(just over 3,000 NM), it is typical to encounter a lot of calm air in the ITCZ. It is also desirable, once the diesel is on, to charge/make water/etc. esp. if a longish motor
run is anticipated. So the extra capacity is desirable. Secondly, I would likely refuel in Venezuela
, which diesel is 3 cents/litre at Caracas, and I would carry 12 x 5 gallon diesel cans on deck
, perhaps half of which I would use during the nearly obligatory motoring phase of the negotiation of the Panama Canal
So if I leave with 30 gallons on deck
and 140 in the tanks for a three- to four-week trip to the Marquesas
, I don't think this is overkill, but is actually appropriate for the sort of "expedition" we are contemplating, where reliable and/or reasonably priced diesel may not be available or, if available, will be at widely separated spots. The logic is partly absolute, as plenty of motoring may be required to offset other consumption
, and partly economic, just as it is for any ship.
This is part of the equation that differentiates "cruiser" from "expedition", where, as is implied, the "expedition" boat has to be prepared to carry everything needed from "internal stores". It's a different type of cruising, but in reality, it's more like the Smeaton and Hiscock type of the '50s and '60s, when outside of Europe
and the States, few if any facilities existed for the cruiser, because few if any cruisers went where they did.