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[hama]

Hello!
A summer sail;
After having to hold position off the coast for weather to improve, loading could commence the following morning. A smooth crossing on a calm sea and the cargo was discharged.
Some summer fun

[Martin (Admin)]

Nice!   

[derekwarner]

Very nice indeed hama   ...


I know I had questioned this previously [in passing], but from the image....am I correct in thinking the water tight integrity is via the bow ramp pulled tight into the hull with the lowered section of the bow being cosmetic & just maintaining the normal function of dividing the wave/water?


If this is the case, is there a sealing gasket surface?


Derek


[PS...I had for many years  worked on Navaere hydraulic  Stern Ramps with Doors]....
[Hagglunds Marathon Motors + Vickers Systems - multiple wire driven]

[/size]These are the type now used on the Box Boat Car Carriers][size=78%]

[Dave_S.]

Reminds me (slightly!) of my rides (motorcycle) from Finland to England, always felt I was really on the way when I disembarked from the Turku ferry in Stockholm.

[hama]

Thanks all of you for your kind comments!
Derek, you are correct. The ramp is the WT part, the visor can let some water pass but it passes out again when the speed goes down. This is a very small boat, only 62cm at a scale of 1:200, that gives tolerance at a fraction of a millimetre when the ramp closes and that's enough to keep the water out. I didn't know how it would work when I first sailed her but no seals are necessary, I think the visor keeps most the water away. When the visor is raised, some drops of water comes out that's been trapped inside despite the drainage hole in the bottom of the visor.
When working as a 2:and off many years ago I handled ramps, visors, quarter stern ramps and such so I appreciate your work experience 
All the best to you all.
Hama

[Colin Bishop]

It is an interesting subject, particularly since the Estonia disaster where the bow visor came loose and in being wrenched around by the waves distorted and fractured the locking mechanism for the raused bow ramp causing it to drop and allow water to flood in.

This video gives a graphic simulation of what happened:

https://www.youtube.com/watch?v=IyqlkWZL0ZI

I think these days only clamshell doors are permitted on deep sea ferries.

Colin

[hama]

Hello Colin!
That's correct, one particular feature of Estonias/Viking Sally design that played a key role was the ramp not being folded but protrudes into a recess on the visor. Bow doors are definitely better as the waves increase the closing force rather than act as an opening force.
The original to my model had an incident early in her career where the visor came loose, after which they rebuilt the locking mechanism. I have not yet encountered such problems.
Hama

[Colin Bishop]

That's a very impressive photo Hama, a lovely model. Ferries are difficult modelling subjects as the high upperworks can make them unstable unless you are very careful with the building process. You have obviously got it correct.

Colin

[hama]

Thanks Colin, but that's because I've been cheating. I've added 1cm to her draft plus she has a lot more bulky underwater body than the original. It doesn't show while on the water and it makes her very stable to sail during most conditions and that was something I wanted to achieve. I'm currently building another slightly larger ferry to the same scale that I've been given a little bit more scale like underwater body, will see how she behave once finished. I'll make a tread of her soon.
Hama

[cos918]

Hi Hama
She look fantastic on the water.
John

[cos918]

It is an interesting subject, particularly since the Estonia disaster where the bow visor came loose and in being wrenched around by the waves distorted and fractured the locking mechanism for the raused bow ramp causing it to drop and allow water to flood in.

This video gives a graphic simulation of what happened:

https://www.youtube.com/watch?v=IyqlkWZL0ZI

I think these days only clamshell doors are permitted on deep sea ferries.

Colin

Colin
Ferries with lift up bow vissor are rare. Still several operating all over northen Europe. Some on deep sea routes . The main reasion Cam shell is more common is the cam shell door can  open and close the Bow doors while tied up. With a lift up bow vissor most have to open close it while just off the dock. Some dont if they have an internal ramp. Cam shells are safer as waves push tighter closed.
I would say a ferry is no worse than a war ship to build . I have made two and had no real problems
John

[hama]

Thanks John!
She would fit on the car deck of your Celestine I believe 
Hama