25
Coolant
Engine coolant should be above “cold” level (when the engine is cold) in the
reservoir on the forward wall of the engine room. There is spare pre-mixed (50/50)
coolant in the storage bin on the starboard side of the engine room. Note that the
raw coolant is concentrated and must be diluted to a 50/50 mixture of coolant and
distilled water before use.
Fueling Process
Port and Starboard fillers are located on the respective sides of the vessel, just
behind the wheelhouse side doors. A cap key (on a floating key ring) is in the
navigation desk drawer. A spare can be found in the storage bins on the starboard
side of the engine room.
Osprey
carries up to 324 gallons of diesel (162 gallons in each side tank). The
contents of each tank can be observed via the circular fuel tank at the helm. Use the
toggle switch to view the contents of the left/right tanks. We have found the gauge
to be fairly accurate, so using simple math, estimate to the nearest 1/8 increment
how much fuel is in each tank, compute the current level, subtract it from 162, and
you will have a pretty good idea how many gallons to add to each tank.
While filling, be certain to form a “doughnut” around the filler hole with paper
towels or absorbent pads.
Our standard procedure is to fill the tanks to roughly
the 95% level to avoid inadvertent spillage. There is rarely a need to fill beyond
this level, and filling to slightly less than full significantly reduces the risk of spillage
and environmental damage. As you fill, have someone watching the fuel gauge
and advise you as the tank approaches the “Full” mark. When you get close to the
expected amount needed for the tank, that’s when to be particularly careful and
reduce the flow rate.
Remember:
Protect the environment. Fuel spills are your responsibility and may
need to be reported to the Coast Guard. If in doubt, better to leave the tank a few
gallons short of absolute capacity than to risk a spill.
Fuel Consumption
Osprey
has a semi-displacement hull design and is very efficient at low speeds, a
classic characteristic of trawler design. The table on the next page shows typical
fuel consumption rates, based on data taken during sea trials of a sister ship of
Osprey
. We have found the values shown to be generally accurate
• Economy cruise: 1000-1400 RPM yields 6.5-8.5 kts and consumes 1.0-2.1 gph
• High speed cruise: 1800-2200 RPM yields 9.5-11.5 kts and consumes 4.9-8.7 gph
We have found it most comfortable to cruise at 7-8 knots with an engine speed of
1200 – 1300 RPM. It allows time to enjoy the scenery and maintains a relatively
quiet noise level while being able to cover reasonable distances in a day. We’ve
also found that it’s not good to baby the engine all the time, it is actually good to
run at high-speed cruise loads every so often. Running at those higher speeds
ensures carbon buildup is kept at a minimum. So please run at higher speeds of at
least 1800 RPM at least every other day for 15 minutes or more.
Table of Contents
Summary of Contents for Nordic Tug 37
Page 1: ...Osprey Owner s Notes...