Lines Plan Question

[Dennis Marshall]

As I look at the profile drawing of my Atkin skiff plans, I notice that there is a baseline, LWL, and then a "floor line" above the sheer. I have been consulting Chapelle's Boatbuilding, but can find no reference as to what a floor line is and what it means. Can someone here give me a clue? Thanks.

Dennis

[Wiley Baggins]

Not having seen the drawings, but knowing that many of the Atkin plans were drawn for home builders, perhaps it is associated with the building jig. I assume that the boat is built upside-down, which is the only way the "floor line" could be above the sheer on the drawing.

[D Gobby]

All take a shot at this.
The Boat is built upside down.
The floor line refers to the building baseline.
That line represents the floor,top of the strongback,building jig whatever.
It is a level plane in all directions.
The height of the building baseline can be whatever is comfortable for you as long as it is level in all directions.
I built my stongback 24" tall to bring the boat up to a comfortable height to work on instead of the floor.

Darrel

[DesignByBird]

Dennis

Dennis, Again I am not familiar with Atkin’s plans, but as a designer I have had call to 'offset' a datum line for clarity and yet ease of reference (after all this is all a baseline is).

The datum line that you refer to, might be just that ; a datum offset by a convenient figure, lets say for example 60” above the floor beams ~ from which all furniture and deck can easily be measured when fitting out.., after all measuring from a baseline is awkward at best, and the designed Waterline LWL doesn’t help much from the inside either. Perhaps Atkin proposes a taut fixed wire (easily set up when the boat is upright) from which all interior measurements can very easily and conveniently be dropped. Makes sense to me..!

.. might be worth checking out..?

Have fun, be safe, Pete
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