True. Using my fuel usage numbers from Touche's AT4 experience and
Universal 25XPB:
Diesel
0.7 gph x $2.76 = $1.93/hr
Gasoline
1.0 gph x $1.83 = $1.83/hr
That's pretty much the same $$ in my book.
The big difference is range.
Diesel
18 gallons/0.7 gph = 26 hours or 165 nm @ 6.3 knots
Gasoline
18 gallons/1.0 gph = 18 hours or 100 nm @ 5.9 knots
Dennis C.
On Tue, Jan 13, 2015 at 12:43 PM, Russ & Melody via CnC-List <
cnc-list@cnc-list.com> wrote:
>
> Fuel cost comparison is a red herring.
> For most people on this list the amount spent on motoring boat fuel this
> winter is remarkably the same whether the auxiliary power is electric,
> gasoline or diesel. :)
>
> Cheers, Russ
> *Sweet *35 mk-1
>
> At 07:13 PM 12/01/2015, you wrote:
>
> As gasoline engines go the Atomic 4 has a flat torque curve.
> There are various version of the A4 around, but the common 30 HP
> variant had about 35 ft/lbs at 1000 RPM, and "peaks" around
> 43 ft/lbs. From about 1800 RPM to 3500 RPM it stayed within
> about +/- 1.5 ft/lbs.
>
> If you compare the Beta Marine 25 HP diesel ( BD902 ) it has a
> similar curve, maybe +/- 2.5 ft/lbs from 1600 to 3600.
>
> Since HP come from torque x RPM the HP curves are similar.
>
> On a 27 - 32 moderate displacement sailboat the Atomic 4 and
> a 1:1 transmission was an adequate match. A target would be to
> maintain 70 - 80% of hull speed at around 1800 RPM with some
> head wind and seas. On an A4 that would be around 13 HP.
>
> Fuel economy? I went by a gas station earlier today. Gas was
> $0.81 a litre, diesel was $1.15 a litre. Ouch!
>
> Michael Brown
> Windburn
> C&C 30-1
>
>
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