58 Sedan Bridge Official Thread

David Voss said:
Has anyone looked into retrofitting a Seakeeper stabilizer system in the 58 Sedan Bridge? Can it be done?
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Space is pretty tight in the bilge area of this model... I’d be surprised if room for a SeaKeeper could be found. I’ll be following this for sure to see what others have to say!
 
Another request...Does anybody have a detailed chart of observed fuel usage at different speeds they would share?
 
David Voss said:
Another request...Does anybody have a detailed chart of observed fuel usage at different speeds they would share?
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David - I have found below 1000 RPM, I get 1-3 nmpg. 3 nmpg at 600 RPM/6.2 knots, 1 nmpg at 1000 RPM/10 Kts. I don't run between 1200-1400 as boost is not sufficient, Above 1400 to 2000 it is a .35 mpg boat. More RPM gives more speed and fuel flow, but it always works out to .35 nmpg...
 
Trinity said:
I am having a Hi pressure alarm on my v berth ac unit- i have back flushed the unit and i think i have water blockage inbound to the unit - i am trying to decide how to back flush the inbound water hose - any suggestions
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I had this problem earlier this season. Flushing through the pump wouldn't clear it so I connected a hose to the discharge side of the forward AC unit and another one at the inlet side of the manifold in the E/R and extended that hose outside the engine room. I was amazed at how much more stuff came out flushing in that direction. Of course you have to figure out which one of the four hoses on the manifold is for the forward unit.
 
bmac said:
I had this problem earlier this season. Flushing through the pump wouldn't clear it so I connected a hose to the discharge side of the forward AC unit and another one at the inlet side of the manifold in the E/R and extended that hose outside the engine room. I was amazed at how much more stuff came out flushing in that direction. Of course you have to figure out which one of the four hoses on the manifold is for the forward unit.
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Brian - is the manifold outboard/forward of the stbd engine? I took a quick peak this past weekend and didn't see it...
 
David Voss said:
Has anyone looked into retrofitting a Seakeeper stabilizer system in the 58 Sedan Bridge? Can it be done?
Click to expand...
I looked into it. It can be done. The local Seakeeper distributor quoted me $105k.
 
carterchapman said:
Brian - is the manifold outboard/forward of the stbd engine? I took a quick peak this past weekend and didn't see it...
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Carter, mine is immediately forward of the starboard engine just below the HW heater.
 
tc410 said:
I’ve not seen this before on any 550/58DB. Could this be an add on solution for a prior plugged return line? Every boat in this model that I’ve seen has the inside (cabin) AC return exiting out the common drain at the stbd exhaust and the bridge AC return exiting out the port exhaust.
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I believe my FSR AC, MSR AC and Bridge AC raw water discharges all flow through the port common drain and my two Salon AC units flow through the starboard common drain.
 
carterchapman said:
David - I have found below 1000 RPM, I get 1-3 nmpg. 3 nmpg at 600 RPM/6.2 knots, 1 nmpg at 1000 RPM/10 Kts. I don't run between 1200-1400 as boost is not sufficient, Above 1400 to 2000 it is a .35 mpg boat. More RPM gives more speed and fuel flow, but it always works out to .35 nmpg...
Click to expand...

What RPM and speed do you consider a normal on plane cruise speed?

The manual says fuel capacity is 700 gallons with 595 gallons useable. Is the 595 the 15% reserve you should plan on or are the tank shapes/pickup points so weird that they can only pickup 595 of the 700 gallons and you need to plan a reserve on top of that? If the 595 is all that can actually be picked up it seems like awfully small tanks for .35nmpg boat, even the 700 is small.
 
swaterhouse said:
Where were you/they looking to put it?
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On top of the stringers just forward of the generator or possibly against the forward ER bulkhead between the HWH and VG's. If the former it would severely limit ER access in every direction and if the latter, at a minimum the shower sump would need to be relocated. Even at a much lower cost I don't think I would do it given everything involved. They claim that they have done one 58DB already but I did not pursue viewing the installation.
 
swaterhouse said:
What RPM and speed do you consider a normal on plane cruise speed?

The manual says fuel capacity is 700 gallons with 595 gallons useable. Is the 595 the 15% reserve you should plan on or are the tank shapes/pickup points so weird that they can only pickup 595 of the 700 gallons and you need to plan a reserve on top of that? If the 595 is all that can actually be picked up it seems like awfully small tanks for .35nmpg boat, even the 700 is small.
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Scott, I usually cruise at 23 knots at 2000 rpm burning approximately 62 gph. As Carter said, the fuel curve is pretty flat once you get above 1800 rpms. I can run on plane between 1600 - 1800 rpms and achieve approximately .45 nmpg but I am just dawdling along between 16 - 19 knots. As for the tank capacity, I have seen that 700/595 in the manual. I've never let my tanks run all the way down so I can't speak to the 700, but I can tell you that on my longest run of 10 hours, mostly at cruise burning the 62-65 gph not even my generator tripped. I don't recall how much fuel the boat took exactly but I did have the uneasy feeling I was running on fumes.

Here's some numbers, not sure if this will stay in table format. Speed is in knots;
RPM Speed GPH
1600 16.4 36
1700 18.1 40
1800 19.7 46
1850 20.6 50
1900 21.4 52
1950 22.3 58
2000 23.1 62
2100 25.1 70
2200 26.8 78
2300 29.3 86
2350 31.2 91

Hope that helps.
 
That is awesome info...I am graphing that with the few data points we have collected. Thank you everyone for the quick replies!
 
Care to share anything on the 47, looking at a few and can't find much info, limited production because of the recession. All I've seen are 2008s. Mostly concerned with the performance, again limited data, I've had the QSM 11s and have a need to cruise at least 25 knots, going 200 to 25 miles a day through the Bahamas. Can the boat do that with the smaller Cummins o are you pushing it to max RPM to get that? Any help is appreciated.
 
How do you remove the Master Stateroom television on the 2008 58DB? I would like to replace it with a newer TV.

Ken
 
You have to carefully remove the top and bottom wood trim that runs the width of the tv panel. It is currently glued in place and can be carefully pried off. Once removed, you will see that it covered the screws that hold the entire tv panel in place. From there, replace with tv of your choice and reverse the procedure to reassemble.
 
Pry gently with a plastic wedge. Start at one end and work toward the middle a little at a time. Go slowly and if something sounds like it’s breaking, try a different angle or the other end. Also, be careful not to pull off the black Formica that is on the tv mounting panel. This happened to me and about a 3” x 2” piece came off with the wood trim piece. Slow and steady wins the race here...
 
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