Guest Posted August 21, 2013 Share Posted August 21, 2013 I just had a cup of tea with a guy who drives a big fizzy boat for charter and he told me that statistic - I'm still shaking. Link to post Share on other sites
rigger 47 Posted August 21, 2013 Share Posted August 21, 2013 7.5L/min or 450L/hr That is more per hour than a 3516B (v16) with 2200HP - 400l/hr at MCR What size boat? Link to post Share on other sites
Mothership 6 Posted August 21, 2013 Share Posted August 21, 2013 Left the choke out? Link to post Share on other sites
idlerboat 116 Posted August 21, 2013 Share Posted August 21, 2013 HHmmm, so plus charter costs, booze, etc...say three hours running....... a reasonable catch... Hey not too bad, Thats about $300 dollars a killo for fresh fish Link to post Share on other sites
darkside 61 Posted August 21, 2013 Share Posted August 21, 2013 Rigger is correct The old rule of thumb for diesels was 20horsepower-hours/gallon 450l/hr is 100 gallons/hr so that is 2000hp or thereabouts Modern engines are more efficient so probably a little more than 2000hp. Link to post Share on other sites
idlerboat 116 Posted August 21, 2013 Share Posted August 21, 2013 As a bench mark, most of the Riv owners here (around 38 foot) do 100 litres an hour. Half the speed half the fuel, so the average is the same over distance. The fusion 40 power cat 44 an hour but ten knots slower than the Rivs (the power cat does 22 knots). The ex PT boat, that is being switched back to twin petrols from smaller diesels, for the hell of it (65 + feet) about 600 litres an hour !!! He apparently has good mates that will chip in for a blast....(close to 37 knots on smooth water) The bigger semi,s , 45 feet or so about 200 + The sleek Italian job (40) about 180. Link to post Share on other sites
Guest Posted August 21, 2013 Share Posted August 21, 2013 80ft and that was at 18kn, Big Italian fizzy boat POS. Link to post Share on other sites
idlerboat 116 Posted August 21, 2013 Share Posted August 21, 2013 Me ? 3.8 litres an hour. Isuzu industrial. 53 HP. 38 feet. Medium weight cruising boat. (For a steel boat), or very heavy (by 3.5 tons) compared to a plastic. Clean bum around 7.2 knots. No push or pull. point 6 of a knot above hull speed. From my expirience people are a little bit lose with their boat speed and fuel economy. In particular, I have found that speed under motor, into strong head ways have been very badly exagerated. Link to post Share on other sites
Mothership 6 Posted August 21, 2013 Share Posted August 21, 2013 80ft and that was at 18kn, Big Italian fizzy boat POS. Italian you say? So even more concerning would be the oil consumption, surely! Link to post Share on other sites
Deep Purple 512 Posted August 21, 2013 Share Posted August 21, 2013 Mate of mine just bought a Maritimo 55 with $6000 of diesel in the tanks. An identical boat we were on at Easter recorded by the time he got back to Tauranga after a Easter gulf cruise he'd be up for $7500 to top the tanks up for winter. (he's now relocated the boat to Auckland) Big bucks to run those things..... Link to post Share on other sites
Guest Posted August 21, 2013 Share Posted August 21, 2013 Yep, we figured $1400 of diesel for a trip to Kawau and back. $6k per day if you were silly enough to want to charter it. Link to post Share on other sites
Grinna 2 Posted August 21, 2013 Share Posted August 21, 2013 And you worry about burning 5 litres of diesel to charge your batteries Squid. Link to post Share on other sites
Island Time 1,249 Posted August 21, 2013 Share Posted August 21, 2013 Modern engines, it's all about grams of fuel per HP hour. This is engine efficiency. Then how many HP, how much displacement etc etc, related to speed, then that can give Litres per Nautical mile. The Rivs etc are very heavy, and often have lots of HP. You pay for the total mass in fuel consumption. For example, my bros boat is 44 ft LOA. Has a Scania DI9 - 500 hp. uses 80-90 grams/hp hour. Usually works out about 58 Litres/hour at around 20 -23 knts (conditions and load dependent) - approx 2.9 litres per hour. The boat is considered light (under 10,000 kg) and very economical by all his launch mates....some of which have vessels that use up to 290 Ltrs/hr for the same performance. I reckon filling the boat once to capacity (1700ltrs) is more fuel than I've used in the last 5 years, INCLUDING a 20,000 mile voyage... Link to post Share on other sites
Crocket 12 Posted August 22, 2013 Share Posted August 22, 2013 I once spent a number of years working on a Ski Race boat that burned close to those numbers. Only 21 ft and would blow 400 litres in an hour at full noise. Luckily the silly skiers out back couldn't hold the boat at full throttle so a race would normally be a little more economical than that. They would still be pulling over 200 kph on the straights though. Link to post Share on other sites
BNG 44 Posted August 22, 2013 Share Posted August 22, 2013 I think I will stick with 0.8l/hr at 6.5 kts and an 80l tank... Coupla jerry cans and Fiji here we come... Link to post Share on other sites
w44vi 17 Posted August 22, 2013 Share Posted August 22, 2013 80ft and that was at 18kn, Big Italian fizzy boat POS. Italian you say? So even more concerning would be the oil consumption, surely! Have you ever know an Italian motor to run long enough to consume oil ? The electric's would stop that Link to post Share on other sites
Guest Posted August 22, 2013 Share Posted August 22, 2013 went for a sea trial on the riv 75 a while ago, that sucker went through 990L an hour although that was at 35kts boat speed Link to post Share on other sites
idlerboat 116 Posted August 22, 2013 Share Posted August 22, 2013 YEP, and when my motor cruisers friends give me that fourth drink look, N say..."so whats ya rags worth mate ? ",..wink wink.. I have another sip of mine and reply..."hmmm ya havnt taken ya boat out for a spin lately".... Link to post Share on other sites
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