Official 47 Sedan Bridge Owners Group

I am having a difficult time getting the table on the bridge to come off. I am assuming the the tube is just friction fit in the pedestal and it all just comes apart. Before I attempt to force it, can anyone confirm the table does come off?
 
When it rains, it pours. My washer dryer is broken and I am working on taking it out. Here are the factory instructions to remove it but they missed a step. There's an L bracket between the bed and aft storage that needs to be removed. You'll need a Phillip screwdriver with at least a 12 inch long shank to get at the screws.
 

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Turns out I had another water leak that contributed to the mess. Water was coming in through the dryer vent and then leaking into the bilge. This is looking behind the aft wall in the master stateroom into the bilge. This in turn flows into where the hot water heater sits!
3BB448B4-E427-495D-8273-F01255F9F300.jpeg
 
OK 47 DB owners, need some info as I am going to look at one or 2 soon. I like the layout of the kitchen location, master full beam but am concerned about performance. Ive always been able to cruise at 26 or 27 knots and I can't find firm numbers with the 600 Cummins and V drive setup. I've had the QSM 11s so know Cummins. What is max RPM and speed with close to a full load, then cruise. We travel, mostly 2 of use but normally try for a 6-8 hours a day. I appreciate the help. I know there aren't many 47s out there and hope one has a few minutes to share.
 
WOT - good conditions - maybe. My experience that's a tough sustained speed for cruising.
 
2650 rpms is about 83-85% @ 21-22 knots.
 
FootballFan said:
WOT - good conditions - maybe. My experience that's a tough sustained speed for cruising.
Click to expand...
not planning to run at WOT, looking for info on 85% of WOT and what the boat will be cruising at. Will she sustain 25 knots at 85 % RPM fully loaded. Little data on line about the 47 and hoping owners with real experiences will help. I was going to chase a 58 because of the full beam master but someone mention this model. its only 2 of us normally and the 3rd cabin on the 58 would be wasted. Thanks
 
Barney, Max RPM is 3050 with these motors. That's about 26-27 knots. I try to run no more than 85% which is about 2650 RPMs, 21-22 knots @ 44 GPH. Good luck with your search and let us know how you make out. Mike
 
Smokeio said:
Barney, Max RPM is 3050 with these motors. That's about 26-27 knots. I try to run no more than 85% which is about 2650 RPMs, 21-22 knots @ 44 GPH. Good luck with your search and let us know how you make out. Mike
Click to expand...

We had our 47DB for close to 3 years, ran it a lot.

Now I am wondering if the props were out of spec. Never got as good of numbers that you have @Smokeio.

I love the boat. The back window opening from the Galley was as desirable as we thought it would be.

One of the challenges when we had ours - I don't think there was anyone else on CSR that had a 47. No one to compare with.
 
I have not run with a tender on the swim platform. Did you run your boat with one and did it make a difference with the performance?

In the short time we've had the it, the boat has grown on me. Beside the full master, I'll admit to not being sure about the layout of the salon and galley(my wife loved it). Now that we've had it, I appreciate being able to open the window and door from the galley. Take away social distancing, the salon is a great place for friends and family to hang out.

My only complaint about the boat (besides my water leaks) is the salon couch is not the place to crash unless you add the cushions..... I'm in the process of putting a big TV in the master stateroom to watch TV when needed.
 
The layout is awesome IMO, kitchen near the deck doorway, can service deck and dinette in side. I would always have a dink with me as the Bahamas have so many great anchorages. Your boat is 13 years old, there will be a few area where the caulking will dry out I'm sure, especially where the windows are, they are always trimmed in black which seems to heat the frames, then cool and caulk eventually gives out. I am concerned about being able to get the boat moving, I'm not a speed demon but want to cruise 25/26 knots without pushing the motors. I will keep searching, one in Southern FL has been surveyed and guess there was some delamination, broker wouldn't elaborate but if we look at it I will share. The 56 and 58 SB are at least 25 knot cruise without pushing motors but then they have 800 to 1000 HP motors. Thanks for all the info. How about smoke or soot on the transom?
 
@Smokeio

Most of the time carried a Tender (Zodiac YL340, rib with 40HP motor). Couple of times without it gained maybe a knot. Roughly 600LB.

Would cruise around 2600-2650 rpm. We did quite a bit of 120-150NM days. Speed varied based on conditions, but mainly saw an average of 17-18 KN. 60-65 GPH on average. We kept a clean bottom.

Friends that have similar size SR's (Flybridge) which have QSM11's could routinely cruise 24-26KN.

Significantly more displacement on the QSM11 than the QSC600.

@Barney Horan

We loved the layout of the boat. Except for the fact that we wanted a larger boat, would probably still be in the 47DB. Seems like everyone who actually got on one, either loved it - or hated it. Not much in between.

Most common negative comment, the step between the galley and salon was a standard comment. I am guessing the step was necessary to provide the headroom in the Master Stateroom.
 
Barney, I have a few delamination spots. Look in the master head (I assume from water splashing around the sink) and the sink in the galley. No smoke or soot when running, motors run clean. As noted before, you are not gong to cruise at 25-26 knots without running at or near max RPMS.

FF, Thank you. I wondered how she handles a tender. Your GPH looked really high. Both your speed and GPH looks like something was off there. Like you indicated, it's nice to have others to review problems and performance.

I forgot the stairs. This boat will also give you a concussion if you are not careful. I've hit my head at the first step coming down the stairs going down below. The master is also a good spot to bump your head. Whoever had my boat before me put Bump Head Here above the gunnel steps.

Mike
 
@Keith Zibilich what's your boat run at 85% load? I seem to recall the top speed being 30-31 mph at the time I had the plotter set up in mph not knts.
 
Got curious, started digging around this morning. Went back and looked at the original survey and then some spreadsheets I did with the boat cruising.

Some of my numbers posted were not representative. Not as bad as I remembered regarding speed. Will get some data points organized and post.
 
ok, Some of the numbers I posted were not correct. Started bugging me when others had numbers which were different, so I dug out some old documents on the boat.

We have been in our current boat for 3 years, so we purchased the 47DB a few years prior to that. Survey on the 47DB was September 2014. My memory was faded - did not want to have comments out on the website that were not as accurate as could be.

Also when I was looking at boats, there wasn't any 47DB presence on this site. Thought it would be good to correct my postings to make them as accurate as possible.

Sea Trial was after haul-out and pressure wash of the bottom. No tender, no personal items, and 1/3 fuel. Every cabinet empty. Sea Trial was conducted in the ICW due south of the bridge at Wrightsville Beach, NC. There was a southbound run then a northbound run - averaged together for the table below. There was 5 people on the boat including myself.

This is a cut and paste from the survey.

Survey 47db.JPG

The above speeds are in MPH, All of my logs (discussed below) are in Knots per Hour.

After we brought the boat back to FL, we did considerable cruising in the Keys which would be a 5-6 hour run going down. To pass the time several occasions I captured log data which include fuel burn, rpm, speed.

Also did a corresponding calculation of full tanks and fuel purchase amount. The boat would be fueled at the home slip which was a couple of miles from Baker Haulover inlet. We would leave with full tanks, then typically pull directly into the Marathon Marina on the south side and fill up before continuing to final destination. The calculations supported the Fuel Burn numbers where were taken off the monitor.

All of the log records I dug up were in Hawks Channel, west bound, running inside the reefs. Labeling this as Cruise data.

Cruise Data
Average Cruise RPM, 2654.
Average Speed, 18.5 KN
Average Fuel burn, 58.5 GPH (both engines, + Genset running )

Couple of thoughts:

My cruise speed - from Survey ( 25.2 MPH or 21.8 KPH) to Cruise Data (18.5 KN) dropped 3.3 Knots.

Survey - boat was stripped of all weight possible.

Cruising Logs - boat had everything we could think of to possibly carry with us. Including a tender on the swim platform ( which is closer to 800lb's, than 600). Most logs were after we turned the corner heading west - so fuel would have been right around 3/4 full. Logs were with a "Diver" cleaned bottom, not an out of the water pressure washer cleaned bottom.

Observations.

Yesterday I thought maybe my boat had the incorrect props, now I would lean towards the amount of weight we were carrying and the fact we were in open water. Not sure if there is an East/West bias in Hawks Channel due to Gulf Stream. Could be, just don't know. But unless pushing against a significant tidal current, usually get much better speed numbers in the ICW than open water.

The original question asked, would the boat do 26-27 knots at Cruising RPM? The boat I owned would not.

The 47DB is an excellent boat. If I was buying a 50ft boat, in the same general age range, the 47DB would be my first choice.

Hope this clarifies (and corrects) my earlier statements. Just wanting to be as accurate as possible.
 
FootballFan said:
ok, Some of the numbers I posted were not correct. Started bugging me when others had numbers which were different, so I dug out some old documents on the boat.

We have been in our current boat for 3 years, so we purchased the 47DB a few years prior to that. Survey on the 47DB was September 2014. My memory was faded - did not want to have comments out on the website that were not as accurate as could be.

Also when I was looking at boats, there wasn't any 47DB presence on this site. Thought it would be good to correct my postings to make them as accurate as possible.

Sea Trial was after haul-out and pressure wash of the bottom. No tender, no personal items, and 1/3 fuel. Every cabinet empty. Sea Trial was conducted in the ICW due south of the bridge at Wrightsville Beach, NC. There was a southbound run then a northbound run - averaged together for the table below. There was 5 people on the boat including myself.

This is a cut and paste from the survey.

View attachment 95459
The above speeds are in MPH, All of my logs (discussed below) are in Knots per Hour.

After we brought the boat back to FL, we did considerable cruising in the Keys which would be a 5-6 hour run going down. To pass the time several occasions I captured log data which include fuel burn, rpm, speed.

Also did a corresponding calculation of full tanks and fuel purchase amount. The boat would be fueled at the home slip which was a couple of miles from Baker Haulover inlet. We would leave with full tanks, then typically pull directly into the Marathon Marina on the south side and fill up before continuing to final destination. The calculations supported the Fuel Burn numbers where were taken off the monitor.

All of the log records I dug up were in Hawks Channel, west bound, running inside the reefs. Labeling this as Cruise data.

Cruise Data
Average Cruise RPM, 2654.
Average Speed, 18.5 KN
Average Fuel burn, 58.5 GPH (both engines, + Genset running )

Couple of thoughts:

My cruise speed - from Survey ( 25.2 MPH or 21.8 KPH) to Cruise Data (18.5 KN) dropped 3.3 Knots.

Survey - boat was stripped of all weight possible.

Cruising Logs - boat had everything we could think of to possibly carry with us. Including a tender on the swim platform ( which is closer to 800lb's, than 600). Most logs were after we turned the corner heading west - so fuel would have been right around 3/4 full. Logs were with a "Diver" cleaned bottom, not an out of the water pressure washer cleaned bottom.

Observations.

Yesterday I thought maybe my boat had the incorrect props, now I would lean towards the amount of weight we were carrying and the fact we were in open water. Not sure if there is an East/West bias in Hawks Channel due to Gulf Stream. Could be, just don't know. But unless pushing against a significant tidal current, usually get much better speed numbers in the ICW than open water.

The original question asked, would the boat do 26-27 knots at Cruising RPM? The boat I owned would not.

The 47DB is an excellent boat. If I was buying a 50ft boat, in the same general age range, the 47DB would be my first choice.

Hope this clarifies (and corrects) my earlier statements. Just wanting to be as accurate as possible.
Click to expand...


The survey numbers are much closer to what I recall our boat running. Keep in mind we would only be moderately loaded as we boated on inland rivers. I recall a solid 31/32 mph WOT.
 
@FootballFan Thanks for posting! Your survey fuel burn numbers are inline with two 47DB's that I've sea trialed.

Most interesting, your oil pressure differential between port and starboard is the same that I've seen on these two 47DB's. That is, there's a close to 10psi difference, with starboard being higher. Are others seeing the same? I was concerned about this, but perhaps it's normal?
 
We had the same thing with oil pressure. I was told it was due to have the oil systems where run
 
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