Q about marine engines
Velovich
i have a question about one such craft.
A 60' Custom Little Harbor, built in 1995.
Web link to page:
http://search.yachtworld.com/boats/view_result.cgi?boat_id=18177&units=Fee
t&listing_id=1712&page=
Here are the specs:
60' Custom Little Harbor
Built in 1995.
Located in Portsmouth, RI
YW# 1712-18177
$1,990,000 (US)
Additional Specs, Equipment and Information:
Builder/Designer
Builder: Little Harbor
Designer: Hood Design
Dimensions
LOA: 59'9
Beam: 17'3
Displacement: 78300 lbs.
Draft: 5'5
Hull Material: Fiberglass
Engines
Engine(s): Twin 760 hp MTU
Hours: 1061
Cruising Speed: 21 knots @ 220 rpm
Max Speed: 26 knots @ 2500
Tankage
Fuel: 1550
Water: 400
The Question: How far, on cruise, in moderate weather, will 1550 gallons
get a boat like this? it has a V-Planning hull.
<*> V-Man
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His Heart knows only Virtue
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Delete the ".CanDo" from my addy to reply!
Eugene Griessel
> Engines
> Engine(s): Twin 760 hp MTU
> Hours: 1061
> Cruising Speed: 21 knots @ 220 rpm
> Max Speed: 26 knots @ 2500
> The Question: How far, on cruise, in moderate weather, will 1550 gallons
>get a boat like this? it has a V-Planning hull.
Awful difficult to say. You need the specific fuel graphs for that
engine. MTU will gladly supply them. I am looking at what MTU fuel
graphs I have here and would hazard a guess that you would be
consuming around 230g/kWh. Depending on supercharging (sequential or
non) or normal aspiration and intercooling. So I guess at 2200 rpm
you would be using around 154 kg of fuel per engine per hour - 308 in
total. Dunno what the specific gravity of your diesel is either (it
varies) but I would say bank on about 360 litres per hour. I assume
those are US gallons you are talking thus a fuel consumption of about
95 gallons per hour. Or around 16 hours endurance at cruising speed
and a range of about 400 statute miles.
Should you be able to supply more specific data I would be happy to
supply more specific details.
Eugene L Griessel eug...@dynagen.co.za
www.dynagen.co.za/eugene
SAAF Crashboat Page - www.dynagen.co.za/eugene/eug3.htm
Thought for the day .......
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Eugene Griessel
Sorreeeeee! Forgot to convert horsepower to Kilowatts. The revised
figure would be about 236 kg per hour. So 274 litres/hour, 72 gal/hr.
Around 22 hours or 520 statute miles.
Velovich
>figure would be about 236 kg per hour. So 274 litres/hour, 72 gal/hr.
>Around 22 hours or 520 statute miles.
Thank you! that is the data I have, just curious. like I'll ever have such
a boat, unless I can bank my USTAFISH Prize Shares over time and trade them in
on the next one after I get the amount needed.
Eugene Griessel
>>Sorreeeeee! Forgot to convert horsepower to Kilowatts. The revised
>>figure would be about 236 kg per hour. So 274 litres/hour, 72 gal/hr.
>>Around 22 hours or 520 statute miles.
>
> Thank you! that is the data I have, just curious. like I'll ever have such
>a boat, unless I can bank my USTAFISH Prize Shares over time and trade them in
>on the next one after I get the amount needed.
I remember a farmer asking me how many miles to the gallon (British
gallons) we got on the 96 foot crashboats at cruising speed (22
knots). Undoubtedly thinking of his farm tractor. He was rather
shocked when I told him it was about 4 gallons to the mile.
We used to do specific fuel consumption tests using an accurate 1
gallon glass jar which was piped into the fuel circuit by a quick
changeover valve. You would run the engine at the speed needed for a
few minutes and swing the valve so that it was sucking from the gallon
jar - at the same time hitting a stopwatch. Didn't take long to empty
it!
On the type 12's at flat out speed it was 11 and a half tons of FFO
per hour. Never bothered converting it to gallons!