FPB 78 – Get Your Dancing Shoes Ready, And Other Updates

Interior 178

Having previously entertained you with photos of the great room sole, we thought its support and isolation would be of interest, along with a few other tidbits.

 The timber strips to which the sole is attached have noise/vibration isolation material between it and the aluminum structure.

Interior 231

Here we are looking up from the lower deck at the framing, its insulation and a layer of constrained layer dampening material below the great room sole.

Interior 150

The engine room bulkhead looking aft from the head compartment. The penetrations and access port will eventually be sealed.

Interior 147

Close up of the access port for inspection and maintenance under the shower module (left side of photo). The slotted opening on the side of the photo is for wiring and plumbing.

Interior 130

Looking outboard and behind the shower molding. There will be an access hatch through the shower molding back.

Interior 156

Hanging locker, vanity, and storage locker that goes between guest cabins.

Interior 249

Mullion covers. Eventually these will be wrapped with fabric.

Interior 251

Hallway locker .

Interior  253

This locker is removable to provide access below

Engineering 47

Switching now to a line boring machine, essentially a portable lathe. The welded thruster tunnel is being evened up for a close tolerance fit to the thruster prop.

Engineering 52

A look at the line borer at work from the opposite side.

Engineering 42

One of the oversized NAIAD stabilizer fin actuators. These are now both installed and ready to have their hydraulic system connected.

Engineering 56

After exhausting analysis and layout – both on the computer in 3D, as well as inside the engine room in real life, the systems are starting to go in. This is a mock up of the starboard main engine exhaust line.

Engineering 62

Looking down here at the steering platform, with the rudder shaft upper bearing shown (off white), the tiller which is machined from a solid block of aluminum, and the hydraulic cylinder partially shown to the left.

Engineering 55

Two hydraulic pumps for the port side system are shown above, with the steering cylinder roughly in place. Note how the steering platform is integrated into the hull and swim step platform structure.

Engineering 38

A small but important system, the vacuum generators for the aft stateroom heads. These are installed so the check valves are serviceable without removal of the pump. The outlet feeds to the blackwater tank which mounts directly below.

Ali Fab 318

Ever wonder how an internal structural member is welded? The port side can be welded from the starboard side before the starboard hull plating is attached. But the starboard side is welded through slots cut into that topside plate. Those horizontal grind marks are the weld areas.

Ali Fab 327

The anchor sprit is designed to provide two additional functions beyond support for the anchor chain. First, it will act as a walkway (albeit tight) so that we have a relatively easy method of rigging bow springs and anchor snubbers through the fairlead. Second, this is in effect a dive plane, with a positive angle of attack relative to the shape of the shear (hull to deck intersection) and in the unlikely event of driving the bow into an exceptionally steep wave, may provide a bit of lift.

Ali Fab 344

This is the hatch into the forepeak.

Ali Fab 340

And a view of the interior side of the forepeak hatch.

Ali Fab 305

We will close with this shot of the next bay over where FPB 78-2 is getting her great room roof dropped into place. FPB 64-11 is next in line, and then to the right is FPB 78-3.

Posted by Steve Dashew  (April 3, 2015)

12 Responses to “FPB 78 – Get Your Dancing Shoes Ready, And Other Updates”

  1. Carl E Says:

    Hi Steve: Previously, the main engine exhaust was shown as close to deck level. Did the exhaust change to below the waterline for noise abatement? Also, with regard to the great room, does changing the orientation of the stairs change the layout of the starboard aft section of the great room (to, say, a nice office area :))?

  2. Steve Dashew Says:

    Howdy Carl:
    Stair orientation remains going forward as you drop down. Engine exhaust remains about 80cm/32″ above the waterline.

  3. Don Joyce Says:

    Curious about why two pumps per cylinder, and which pumps they are. They look like Accusteer, but I can’t tell with the photo resolution. I have the same dual steering cylinders, but only one pump.

  4. Steve Dashew Says:

    Hi Don:
    Yes,Accusteer. Dual pumps for speed control and extra reiability.

  5. Jono Frankfort Says:

    Hi there Steve, I hope you and yours had a wonderful holiday.
    The question regards insulation. Looking at the photo of the shower enclosure access I must ask if the areas of limited access are not insulated, or do you use something else to insulate these spaces? Also, do you insulate the engine room as you would the any other occupied spaces?

  6. Steve Dashew Says:

    Hi Jono:
    We will do a post on the engine room in a month or two detailing its insulation. As to the area outboard of the shower molding, it has the sysem previously discribed plus additonal noise protection.Under the soleof the shower is an additional layer of foam plus the molding itself is foam cored.

  7. Skip N. Says:

    Hulls 2 and 3 in the welding shed. Where’s 78-1? NCAA games are done Steve, we need updates.

    Ok everybody lets go, updates, updates, updates….

  8. Steve Dashew Says:

    Hi Skip:
    78-1 i in the next shed over being fitted out.We arepretty much done with the 78 so there will be more time for updates.

  9. Scott evangelista Says:


    What are the dimensions of the forepeak hatch?

  10. Steve Dashew Says:

    Hi Scott:
    The foredeck hatch on the FPB 78 is 1.4m long and 80cm wide.

  11. Jack London Says:

    Hello Steve,

    In a post regarding the FPB-97 you mention that if there was a capsize, water would not enter through the ventilation system as it would be above the waterline. With the FPB-78 you have moved the ducts to the top of the cabin, as such what is the system that would prevent water entry through the system in a capsize? thanks


  12. Steve Dashew Says:

    Hello Jack:
    All of the FPB Dorade vents, including the headliner vents in the great room can be adjusted for air flow or sealed from the inside.