Discussion in 'Downeast Boat NEWBIES' started by No Cod, Mar 25, 2018.
I forgot about him. Damn nice boat. Good guy too. Used to be on here a lot.
My Southshore 30 can cruise 23-24 and it tops out at 27 with a 370hp Yanmar. It’s a 2 mile per gallon cruise which is extremely good for a boat
Yup, I was just talking to him yesterday, he'll be at Boothbay for the races.
Jerry, you are not suggesting that some folks might modify their 410 Sisu diesels to gain a competitive advantage are you? Would that not be against the rules?
Just saw this. I have a CAT c7 Acert 454 on my MC 35. I go as follows from some notes in my log...all numbers taken from random days, tides etc:
2000 rpm/13.0 kts/9.0 gph
2100 rpm/13.4 kts /9.7 gph
2143 rpm/13.5 kts/9.9 gph
2150 rpm/14.1 kts /10.3 gph
2250 rpm/16 kts/ 11.1 gph
2300 rpm/14.6 kts/12.2 gph
2311 rpm/14.5 kts /12.9 gph
2350 rpm/15 kts/13.3 gph
2370 rpm/16.3 kts/13.2 gph
2400 rpm/17.6 kts/ 12.9 gph
2499 rpm/17.7 kts/14.7 gph
2700 rpm/19.1 kts/18.7 gph
2878 rpm (WOT)/21.2 kts/23.1 gph
I generally like to cruise around 2300-2400 rpm. Also, I made the mistake of filling all water tanks when I got the boat last year and kept full (I carry 200 gal.) Don't know what I was thinking - next year I will fill 1/3 to save the weight. I also carry 340 gal fuel. Boat was built as cruiser and is heavy but she runs great even with the weight. I'm cutting back some of the "day beds" they had in the cockpit to make the boat more fishy-that will save some weight too. Looking forward to see if my #s change.
Good thinking Ted, think of this. Carry only 40 to 50 gals. of water and save 1000 # right there alone.
I threw the ole lady off once to see if my boat was any faster but it wasn't but it was quitter ........
All my tankage is in the cockpit. I gain over a knot when I put in 400 gallons fuel and 100 water.
Makes sense. I was walking down to the dock one morning and noticed my boat bow heavy by an inch - I panicked - thought I was taking on water. Then the lightbulb went off. Day before I ran dry the cockpit 150 gal tank and was also light on fuel. Bow water tank still had 50 gal. Next season I will put only 10 gal in bow for reserve and keep cockpit tank at 40-50 gal as Mud suggested.
My 36 flowers w/645 qsm11 cruises at 19knots w/app. 18gal /hr.fuel use at 1850 rpm.
at 1950 rpm I am at 20knots at about 19gal/ per hour.
This is with a fully loaded boat 4 people & app. 3/4 fuel (300 gal) 50 gal water, etc
After that consumption goes up dramatically. But I rarely find the need to exceed 18 knots. Very comfortable in most conditions (which is app. 1750 rpm with) & a little better fuel economy.
(boats are not economy cars )
If I was building a boat I would seriously consider putting the genset against the transom. Not ideal for you sportfishing guys but ideal for a family cruiser. I think it would give good balance to most DE's pending other equipment and tanks.
Yeah, that and tabs.
Those too. But it would be nice to get all that noise aft. Also it would make the genset more serviceable.
^ That's a great idea. The question is; Does the gennie need to be on centerline for weight balance and greatest hull depth below decks? If so, that leads to; Is there enough room between the transom and rudder post on a 33-35' for it?
Back to the OP's original question; of the 20+kt. / 33' examples mentioned so far, (33YB w/QSB 480 and 33SW w/FPT 420), can you buy one new or used for $200k?
If building the boat I would build a box the size of the genset out of some plywood to get an idea. My first thought would it would be mounted on deck with an enclosure disguised as seating around it that could be easily removed to gain access. Therefore not interfering with the top of the rudder post. The genset we just installed on a boat weighed 377, that is less than two of me, or around the weight of 10 or 12 lobster traps.
There are two 2008 31' Duffys for sale at $200k. They should be able get a 20 knot cruise. You wouldn't be able to get a new 31'-33' that cruises 20 knots for $200k.
A 31' is a great choice to meet the stated budget, but that's a noticeable step down in size from 33-35'. Might not matter depending on the mission.
Here is a ride on a MC35 with 500 hp
Thanks for all the info. guy`s, I`am looking around for a good used one first.
seems like all the builder`s are booked.