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I have had a GB36 with a Cummins 210 for 3+ years. I run it at
1900-2000 rpm and this gives me approx 8.3 knots. IF I need to keep up
to some GB42s I will run at 2150 and approach 8.8-9 knots. I was out
this summer for 8 weeks and did used the entire range of RPM and speeds.
I used between 2.6 and 2.9 Imperial gals/hour (this should be between
3.25 and 3.6 US gals/hour) My guess that my averag spped would have
been in the 8.5 range although with all the currents on the way to and
from the Queen Charlotte's this is a bit tough to read. This is just
one data point but if you take Marin Faure's data point for his twin 120
Lehman's you could conclude that the single 210 uses about 2/3 the fuel
of twin 120's but there may be many variables.
My biggest concern with 2 engines on a boat like the GB36 is that they
would fill the engine room. I am 6' 2" and the engine room, while snug
is easy to work in.
Also you reduce your maintenance time by half, a non trivial
consideration.
The biggest issue with the single is the handling in adverse conditions
(cross current or stiff breeze when docking). I would go for a bow
thruster rather than a second engine. Of course if you lean to
spirituality, having a single engine is excellent for building character
and soul, so you would lose this if you went with a thruster :-)
Although once you get through the learning curve if it is OK. The
previous owner talked me out of installing a thruster as part of the
sale, and I am OK with the choice. No permanent gelcoat dings in 3+
years.
PassageMaker did an article and a test on docking an identical twin and
a single + thruster and found the handling in close quarters to be very
comparable.
Many boats (like the GB) do not give you twin keels if you go with twin
engines, so for these boats a single engine has the advantage in that
the prop and rudder are very well protected relative to their twin
engine models. Marin has, in my view, pointed out that fuel issues and
cooling system faults are most of the risks to a single engine, but if
your fuel is bad, both engines will stop. My action has been to
install dual Racors to give me some on th fly change over to a second
filter and some time to change filters or get to port. Preventitive
maintenance on the cooling system, perhaps with some temp sensors at the
exhaust elbow to give you earlier warning may be the next thing to
consider.
Good luck in your decision, neither option is a bad one if it gets you
out in the water and off the streets......
Larry Achtemichuk
West Vancouver, BC
GB36 Tiger Lily
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