[Public-List] Measurements for registration

Tue Apr 15 11:27:17 PDT 2008

I have PDF of the lines plan (contact me offline if you would like it)
and was able to make some measurements.

The rules seem a lot like the US tax code, and are there for the same
reason - to maximize income with a modicum of fairness. Don't get hung
up on the measurement being at a strange waterline.

Least Moulded Depth -  to the lowest point on the sheer to the "top of
the keel".

Now later on they say "In the case of a wooden ship or composite ship
the top of the keel is the lower edge of the keel rabbet". The keel
rabbet being cutout where the iron keel is.
I take this to mean the lower corner of the top of the rabbet. The idea
is that powerboat or ship keel is not to figure into this calculation.
This 'wooden or composite' exemption helps us out.
I measure this as 6.30 feet. 85% of this is 5.36 feet.
The waterline 5.36 feet above the top if the keel is 27.71 feet. 96% of
this 26.60 feet.
 (b) is a shorter length so (a) applies.  The tonnage length is 26.60
feet.

I measure the moulded depth amidships to be 6.40 feet.

Mike
Rinn Duin #272

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of David
Fisher
Sent: Monday, April 14, 2008 4:44 PM
To: Alberg 30 Public List -- open to all
Subject: [Public-List] Measurements for registration

Hi All.  I'm currently working my way through the bureaucratic forest of
boat registration here in Oz.  To register for international travel I
need either to supply a builder's certificate, which I don't have, or a
report listing detailed measurements of the vessel.  Most figures are
simple enough and easily found, however there are some which are
unfamiliar to me; I hope that other Albergers may be able to help out.

Taken from the AMSA website, the measurements in question are:  

Tonnage length
The tonnage length of a ship is either
(a) a length equal to 96 per cent of the total length of the ship
measured on a waterline that is at a distance, from the top of the keel,
equal to 85 per cent of the least moulded depth of the ship; or

(b) if the length of the ship measured from the foreside of the stem to
the axis of the ruder stock on that waterline is greater than the length
ascertained in accordance with paragraph (a) - that greater length.

Moulded depth amidships
This is the vertical distance measured (to two decimal places) from the
top of the keel to the top of the freeboard deck beam at side amidships.
(Amidships means the vertical plane situated at the middle of the length
of the ship and at right angles to the centre line plane of the ship).
* In the case of a wooden ship or composite ship the top of the keel is
the lower edge of the keel rabbet.
* In the case of a ship in which the form at the lower part of the
midship section is of a hollow character, or if thick garboards are
fitted, the top of the keel is the point where the line of the flat of
the bottom continued inwards cuts the side of the keel of the ship.
* In the case of a ship having rounded gunwales the top of the freeboard
deck beam at side is the point of intersection of the moulded lines of
the deck and of the side, the moulded lines being treated as extending
as tough the gunwale were of angular design.
* In the case of a ship having stepped freeboard deck, the raised part
of which extends over amidships, the tope of the freeboard deck beam at
side is the point of intersection of amidships and of a line of
reference extending from the top of the freeboard deck beam at side at
the lower part of the deck along a line parallel to the raised part.

If anyone can help me either with figuring these out, or if you have
values for the Alberg 30 already, please let me know.

Cheers,
David
Kalitsah 440
Sydney
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