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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