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This is why communism can never succeed, we naturally define ourselves as ' different' to other people, whether that is richer, better educated or some other hard to grasp peculiarity that other groups of people are totally unaware of. In some ways the definition of class is always assessed on...

Although its true that sociologists try to define class by scientific indicators, each of us has an inbuilt ' class ' detector. Here in Ireland we used to say ' he's a true gentleman', this was a classless statement which defined the quality of a persons behavior, rather than their socio...

I totally understand where you're coming from. The new Chinese rich come to London to gorge themselves on consumer goods; Rolex watches. Louis viton luggage, gold plated jewelry. I visited China 20 years ago, its culture isn't 5000 years old, its only 50. Mao wiped the slate clean and destroyed...

I had to Google rubes. Lol! Is class based on education, wealth, or being from an old monied family?

WW1 killed off the old feudal class system in Britain and Ireland; half were killed off in the trenches, the remainder taxed to extinction with the income tax surcharge introduced by the socialist labour party after WW2 ( more tax than your income) and crippling death duties. Then we had the...

OK so 3 gal/hr at 8kts(2.6 mpg) on single Vs. 5gal with twins(1.6mpg).... Nearly twice the fuel burn, give or take: ok about 60% more...

Yep, gas engines only produce half the power output/gal than diesels, but only weigh half as much.Of course they develop their power much higher up the rev band (3500-4000revs), and that leads to higher inefficiencies . Look at the big ob's at the bottom...

A combination of all those factors! I think Richard in his Kk 42 managed about 3mpg/6kts overall across the Atlantic on a 120hp ford Lehman. The challenge: can anyone on this forum beat 2mpg on a 32' or larger twin engined trawler ? The evidence is in the actual fuel numbers.

There are so many variables in boat performance that boat builders get away with downright lies about fuel burn. A few years ago Fleming had an ad on their website claiming that their 55' trawler ' did about 1 gal/nm at 10 Kts...!!!!' [ aha, perpetual motion drive maybe] So there's a strong...

Nearly every s/d or planing boat over 32' has twins, with the exception of lobster boats, so it its hard to make a real life comparison . If you looked at the consumption graph of twins or a big single in the same hull i would bet that the consumption would be nearly identical at 2500 revs...

Well spotted, I never noticed the anchor; you'd never expect to find one located so far back from the bow.

Yep, that twin engines use x2 fuel consumption because you have to use higher revs to keep engines working well and that means 7-8 kts.

5 kts is snail pace!!! Sorry forgot to say at 7 kts in a single screw; anything slower is like watching paint dry! Your numbers look like 2 mpg....:flowers:

That's all very well in your Tolly with gass engines that don't mind idling along at 500 revs...! :) Given that a big diesel will need a few revs/load not to glaze the cylinders, a twin 200 HP boat would probably have to use 1200-1500revs which will burn at least 2 gal per engine. Of course...

Exactly. I'm surprised nobody has mentioned that twins use nearly double the fuel at displacement speeds. Rule of thumb: 32'/6 tons/ single[200hp] 2 gals/hr@ 7 kts: 3-4 mpg. 32'/6-7 tons/twin[2x200hp] 4gals/hr@ 8kts: 2 mpg or less.

I think you're right, fashion goes out of fashion very quickly, whereas workboat lines stay good looking for decades; the lobster boat look has been going for a very long time and still looks great.

Lol. Its definitely not as sleek as a willard sheer line, that's true; but taking into consideration the fact that ' money is a great impediment to taste' its quite a refined super yacht; I'm thinking of that huge monstrosity Steve jobs was building: yuck!

If you have to ask....lol! Gorgeous interior, just have a look at the dingy garage, and the tenders! Heads are a bit flashy with all that chrome and marble . CRN is Ferreti ownered; Italian design at its best. Love the wood interiors. CRN launches cutting-edge, completely custom 55m atlante...

...if I ever have two winning lottery tickets; actually make that three! Crn 55 mtrs just launched , lovely ' commercial ' explorer look.

I'm just wondering what happens in both engines are driving the shaft, but get out of sync? Would the belt drive tear itself apart?

I have a friend who was an engineer on coasters, 150-200' small cargo ships . I was surprised to learn that they have multiple engines. They cruise along on the small 500hp wing engine when the conditions are good and the load is light, turning on the main 3000 hp engine when loaded up. So...

Interesting site. If only they made 2 into 1 boat gearboxes, instead of ones for ships. I wonder how heavy the lightest version is?

I think the Nordhavn system is probably simpler; standard main engine with single shaft, and a small donkey engine on a separate shaft/ folding prop to get you home. These folding prop engines on shafts are standard issue from Yanmar and Volvo for sailboats, and come in 70hp units. At 5hp/ton...

Don't worry, those massive sailboat ' fin keels' break off if you hit something solid. Lol.

>I know not to turn the switch while the engines are running This because the diodes on the alternator that convert the AC to DC current are very voltage sensitive; if you disconnect the battery load the voltage spikes and fries the diodes. All modern battery selection switches allow you to...