Next message: Barry Brazier: "Re: [world-cruising] Re: boat shopping & engines"
Maybe I got the facts garbled ... I thought you said your Irwin
displaced 16,000 lbs and had a 30 hp engine, which would be pretty
darn close to the 2hp/1K lbs guideline. Apologies if I
misread/misremembered the details.
In terms of gallons-per-hour usage, I'd guess that it would be about
a push between the smaller engine working its heart out and the
larger engine purring along in the middle of its torque curve,
perhaps with the larger engine using slightly less fuel in absolute
terms. But I'd think the engine working less hard would last much
longer. (This assumes that the hypothetical boats in question here
are neither under- nor over-propped.)
Phil
