There has been a lot of news lately about the extra fuel costs that Disney is expecting to incur this year. For instance, the Orlando Sentinel says that Disney recently disclosed that their fuel bill will be about $20 million more this year than last.
At first that sounds like a lot of money and bad news for profitability at the same time. But you may recall back in June I blogged about what Disney was doing to offset the higher fuel costs.
For some months now Disney, like the airlines and all the other cruise lines, has been attaching a fuel surcharge to the each cabin based on the number of people per night in each cabin. So that jump in fuel shouldn't be a big deal unless Disney's finance folks did a bad job of setting the fuel surcharge price (which is unlikely in my opinion).
The only major issue here would be if some group in finance at DCL headquarters made the wrong assumption about projected occupancy for the forward looking cruise schedule. If the occupancy was lower than expected, then the amount they estimated for the fuel surcharge would also be consistently too small.
Ideally it would be just right for ever cruise, but more likely some cruises make a little more (higher occupancy) and some other make a little less (lower occupancy). Overtime the average should hopefully be dead even or slightly positive. Slightly positive might actually even be a good thing since it would allow Disney to buy larger quantities of fuel on price dips, which would help offset the occupancy worries as well.
So there are a lot of variables here to find the right fuel surcharge balance: usage rate, current fuel price, occupancy rate, etc. All of these play into the base price plus the surcharge price. You can bet that finance at DCL has a pretty accurate model that they've built over time based on past performance to help them make these decisions. It doesn't mean they are perfect, but I'd bet they are unlikely to let anything just sneak up on them.
There has also been a lot of talk about slowing down the ships, changing routes to save gas, etc. I don't find any of the arguements given particularly compelling so far. After all, the riders are paying for the difference in the fuel charge (and I think it's probably right on that Disney did a good job of estimating the fuel surcharge).
Likewise Disney isn't wasteful just because they can be, ever dollar saved flows straight to the bottom line after all. People get bonuses for saving money, not for picking obtuse routes because one patch of water in the Caribbean looks different than another (it doesn't right?).
As for cutting fuel consumption, of course there is the new slick coating that the Disney Magic is going to get. Those of you who have been on a Disney cruise might realize that the Magic is the cruise ship that goes on the longer 7 days cruises and is the ship that just recently returned to Florida from the west coast. I think that kind of coating is probably standard practice on cruise ships these days, and no doubt others have tested it out and shown a positive response or Disney wouldn't be bothering now. It will give them maybe a knot or two more speed for the same output power, which over time of course adds up.
As for the engines, both of the ships have 5 main diesel engines which are probably diesel/generator combos. To that end, the motors typically would turn at a constant RPM that maximizes both fuel efficiency and electric generation capacity, and they are engineered to do just that. The references I find are that the ships have Sulzer diesels, which might be true, but Sulzer diesel engines today is part of the Finnish company Wärtsilä.
The genpacks in question are probably something like this, which if you open the PDF on that page you'll notice they turn at a pretty lazy 600 RPM CONSTANT drive shaft speed. They are rated at 96% efficiency. Each one puts out about 11,200 kW, which is pretty close to the 15,445 horsepower that Disney claims each of their models puts out. Oh, and they are BIG. The model I'm showing here is 43 FOOT long, 12.5 foot wide and almost 17 foot tall and they weigh about 200 tonnes a piece.
But remember, these boats are driven with ELECTRIC motors. Those 5 engines drive big electric generators, which in turn power everything on the boat, including the actual propulsion. To that end they feed a large engine drive unit which in turn powers the large electric motors that hang under the ship.
Each Disney ship has 2 GE 4160V LCI's, which GE takes great pride in since they are on the timeline of GE electrical's history as well as a picture and note on on their Automation page! An LCI is a Load Commutated Inverter, which allows the operator to adjust output voltage, amperage and frequency from a given input voltage, amperage and frequency to run electric motors over a wide range of speeds. In this case think of it as electronic speed control. If you want to see what one of the insides of these things looks like, check out this PDF file. I'm not sure if one can drive all the electric motors, but from a marine safety perspective I would assume so for redundancy purposes.
What's great is that unless Disney has upgraded their LCI's from the original units, they are most likely running on Intel 80286 technology (the latest updates and retrofits apparently use a VME mounted 300Mhz Celron)! And just like the panels on Midway Mania, the operator workstations run on Windows Embedded, the same thing more or less that's in that nice Windows based cell phone your carrying.
So are they going to save money running slower? Well, fuel consumption for big diesels like these are usually rated in fuel consumption per kWh produced, or you can convert the given units to that in easy fashion. So if you need to go slower, you use less fuel, down to whatever the engine needs as a minimum to idle at 600 RPM with no to little load. At that point if you need to save more fuel, you have to shut an engine down.


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