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From my experience it is a brick wall when it comes to a trawler or yacht. A friend of mine repowered 6 of these 42' Grand Banks that went to Norway and Sweden about 7 years ago (along with 48's, a few Europa's etc. etc.). I ran all of them to the ship 50 miles away. They needed to have motors newer than 2001 to meet the EU standard to import a yacht, the replacement new Lehmans are 160HP instead of 120 HP. The hull ONLY does 7.2 knots no matter what you do, at 2/3 throttle it did 7.2 knots now, giving it full throttle created a huge stern wake (like 5'), lifted the bow a bit and still 7.2 knots. Surprisingly I've run several displacement hulled boats that were seriously overpowered, whereas hull speed was like 2/3-3/4 the rpm of rated cruise RPM, they wouldn't go any faster if you gave them more throttle. One was a 60' defeaver with 6v53 TI's, hull speed was at 1600rpms, rated cruise 2400rpms and WOT 2800 rpms, on survey/seatrial we did WOT, it didn't go any faster either. Also if you tried to exceed hull speed and in less than 10' of water, it would do a 180 in 2 boat lengths. Please keep in mind I run 100 different yachts per year on average, for 20 years, and do 10,000-15,000 NM's in deliveries every single year. While long narrow boats like a sailboat can exceed displacement speed given enough power, a fat portly trawler isn't going to. Most power trawlers will hit hull speed at 65-80% power or less, so you're cruising at hull speed (not WOT). The larger diesels don't burn anymore fuel running them at less of a load to hit hull speed......load determines HP needed, determines fuel needed to make that HP. As for the OP, you'll end up averaging 2.5 nmpg in a 42' Grand Banks trawler most likely, 60 NM a day, 25 gallons of fuel per day. The loop is around 6200NM with all of the marina pull ins and outs......at a 5 knot average (which is what you'll average when you figure waiting on all the locks, current, etc. ). 1248 hours/ 8 hours a day= 155 days underway.....doesn't leave much time to stop and smell the roses. | |||
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It amazes and pleases me that every once and a while on this forum you find someone who is a real expert on the item being discussed. Wow! I no longer sail but I sure learned a lot from the above post. Thanks Jimmy123x My Native American Name: "Runs with Scissors" | |||
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| I'd rather have luck than skill any day  |
Thanks for all the terrific replies, especially you Jimmy. I was hoping you'd comment...that was sure enough some great info. It was hard for me to wrap my head around the much larger and powerful engines not using more fuel. Of course I was trying to gauge fuel costs, but that is only one of many. I'm also still trying to see how many days we could comfortable go between marina stops. At $5~/ft/night that'll add up in a hurry too. The wifey was looking through the boattrader with me. I can promise you none of those 25 year old boats made the cut!  She did like one of those newer Europa's. Gulp! | |||
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Don't overlook the power catamarans. Check out Leapords and Lagoons....in the 40-45' range. IF you planning on doing the great loop, workable side decks are a must. As you have to have someone on the bow and stern tending to the lines in the locks. Diesels barely sip fuel at lower rpms (2300 rpm diesel will sip fuel at 1000 rpms and less for example). Dockage is pretty cheap for 2/3 of the loop. It's the East Coast mostly where it's pricey. The 75' Hatteras MY if I kept it at hull speed 1000rpms/ 10.2 knots we used 13 gph with the generator. At cruise 1900 rpms/17.5 knots we burned 90 gph. There are a lot of loopers that tie up on the lock walls and such for free or almost. Some had only 30amps electric. But if you need 50 amps, you could have a 50' 30 amp cord and a splitter to make 50 amps 240v out of 2 outlets. You can also anchor, but need a cruising guide and charts to find areas out of the way you can anchor. I did the loop in a 75' Hatteras MY and was able to find a place to anchor every night from Chicago South, except we stayed in a marina every 3rd night. Anchoring is a whole nother ball of wax. IF you do the loop on the right schedule, you can get away without A/C mostly. We ran the generator all of the time (used around 1 gph or so on this yacht), needed to in that yacht, but when you add up generator maintenance and fuel it's just as cheap to stay at a marina ar $3' or less. Some people stay on anchor without running a generator and have an inverter bank and use minimal electricity. | |||
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