Grażyna – Part V

Hatches
The following is taken from ‘A Handbook of Practical Shipbuilding: With a Glossary of Terms’ – Pub .. page 132

The Engine Hatch consists of an opening in each of the decks directly over the engine. This is enclosed by a light bulkhead carried around all four sides from the lower to the highest deck which may be the bridge deck. Here the opening is covered by means of an Engine Room Skylight which is made portable so that it can be lifted off by means of a crane if there is any repair work to be done to the engine. On the top of the skylight, small shutters (or covers) are fitted so that they will hinge up on end and give plenty of ventilation to the engine room. For additional lighting, when the covers are closed, they are fitted with glass ports, or windows.

In order to obtain access to the engine room, a door is cut in this enclosure and a ladder is carried from there down to the engine room floor. This door is usually on the upper deck in the bridge enclosure where it is customary for the engineering force to be located.

The Engine Room often has four cowl ventilators fitted, one in each corner of the Engine Hatch, standing above the skylight enough to have an unobstructed draft.1

Note: From this I think it should be clear over the engine. The addition of a skylight fitted with shutters and glass ports/windows will add greatly to the model. A ladder/stair from the hatch to the bridge. This needs to be carried over in the ship design.

The Boiler Hatch is another opening similar to the one over the engine in that it goes up to the weather deck and is enclosed on all four sides below that deck. Opening through the enclosure gives access to the boiler room by means of a ladder. The top of this hatch is covered with what is termed the “Fidley Hatch.” This is a square box-like arrangement standing a little above the deck, which allows the funnel to pass up through and is covered with a grating to give sufficient outlet for air from the Boiler Room.

The Fidley Hatch – An iron casing enclosing the foot of a funnel, above the smokehole, sometimes also the boiler hatchway. It is fitted with bar gratings, “fidley gratings,” and lids, which may be opened or closed according to the weather.2

The Boiler Room is fitted with two cowl ventilators, of larger diameter than those in the Engine Room. They are fitted in the two forward corners of the boiler hatch and stand above the Fidley Hatch to have a good draft. The cowl hood of all these ventilators is built separate from the ventilation trunk pipe (which is round in section) and rests on top of the trunk as a guide, so the cowl can revolve. On the outside of the cowl, below the throat and just above the trunk a gear rack is fitted to engage with a pinion gear wheel. (operated from Engine or Boiler Room). The ventilators in the Boiler Room are made larger in diameter as they are also used as elevator shafts. The Boiler Room has ash buckets which are used to raise and dump ashes over the side into the dump scows while in harbor, if the steamer is a coal burner.3

The Cargo Hatches are sufficiently large to allow ample room for handling the cargo in and out by means of the Cargo Booms.
(…)
Around the Cargo Hatches, on the Upper (weather) Deck a Hatch Coaming of plate stands above the deck about 3 feet, generally in the same vertical line with the beams at end of hatch and the fore-and-aft girder.

This coaming is braced strongly with pocket plates to the deck and carries a small angle around the inside, set down from the top a few inches, as a landing for the Hatch Cover.

Cargo Hatch Covers for the design just described are generally of wood plank about 3 inches thick arranged in lengths and widths to completely cover the hatch opening. Over the Hatch Cover, on the weather deck, canvas tarpaulins are laid and secured tightly by carrying over the edge of the coaming and held against the coaming by means of Battens.
Some ships have a steel Hatch Cover hinged on either the forward- or after-end. This is built up of plates and angles, stiffened to prevent buckling and made watertight by means of a rubber gasket on the under side, near the edge. The cover is held down by “dogs” (clamps).

Cargo Hatch
hatch_1-1200Starting to make the cargo hatch. I glued four 3/4 in. sq. dowels to form the outline of the hatch .. and as the prior reference says .. “a Hatch Coaming of plate stands above the deck about 3 feet“. This will form the support for styrene ‘plate’.
Berthing
bittsThis diagram shows how a ship is birthed. On the stern it is basically reversed.
Cowl Ventilators
CowlVentilatorsAt some point during this I realized that I would need Cowl Ventilators for the ship. These were used on all ships prior to forced ventilation. I looked around and wasn’t happy with what I found. Even if a website shows some there is little information on them .. or a photo large enough to see how they are made. That made me decide to design my own in Sketchup .. so I made a separate thread for that. – Cowl Ventilator
Sketchup’ing
CabinWorking_1Working on the design of the superstructure. Having to work within the limited area behind the cargo hatch. Having fun here! 🙂 – the left side is exported directly from Sketchup while the right side is the same scene as rendered in Kerkythea – using colors and such as exported from Sketchup.
Mocking up
MockUp-1I’ve started to mock-up the superstructure using cardstock. Using cardstock means I can modify easily until things start aligning. Example the bit between the rear cabin and the Engine Hatch needs to be wider .. give the little people at least three foot.
MockUp-2The rear structure is pretty much finished mocking up. Working on the forward structure .. which will include a small ‘promenade’ deck for the passengers. Still got to modify the lower portion with the portholes .. the sheer of the deck means I need to either remove some from the front or add to the rear to level the roof.
MockUp-3Ok. I think this is “Good Nuff”. The whole idea was to move from the Sketchup drawings to cardstock to get a much better idea of where all the bits could go in relation to all the others. I’ll be able to reverse the process moving from the mock-up back to a drawing for the build in styrene.

  1. A Handbook of Practical Shipbuilding: With a Glossary of Terms – by James Douglas MacBride – 1918 – Pg.193 []
  2. Modern shipbuilding terms – Fred Forrest Pease – 1918 []
  3. A Handbook of Practical Shipbuilding: With a Glossary of Terms – by James Douglas MacBride – 1918 – Pg.193 []

Comments

Grażyna – Part V — 2 Comments

  1. Ed, why have I not been seeing your updates on Facebook? The last item I saw was the cowling that you were creating for 3d printing. Looks like you learned alot more about boats.

    • Think that was the last I posted. I got an email from Shapeways today that the parts are headed to the printer. When they get here I will be updating for sure!

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