To download the rules as a pdf.file click here.
Seefahrtkreuzer
Class Rules
(National
German Boxrule Classes from 1928  1949)
Building
rules
All
Seefahrtkreuzer have to comply with the relevant Germanischer Lloyds
class rules for the scantlings of wooden yachts, and be certified to
prove this.
All
Seefahrtkreuzer shall be keel yachts.
Spade
rudders, dagger boards and other such appendages are forbidden.
Measurements
Max
Length over all (LOA) is 1.5 of the measured length water line (L).
Bow
overhang shall not greater than .25 of L
Stern
overhang shall not be greater than 0.35 of L
Beam
at waterline shall be taken at .55 LWL from the forward perpendicular
shall not be smaller than 0.9 B
The
draft at the trailing edge of the keel may be no more than 5% greater
than the draft at 0.55 L
The
lowest point of the sheerline for all yachts must be at least 1.25%
of the LOA lower than at the stem.
Cabin
sole length and breadth are to measured to the inside of the
planking. The actual sole may be at any level. (refer to table for
length and breadth measurements). Measurement sole height is to be
marked by roundhead screws.
Exceeding
the limits
The
table limits are to be taken as a minimum value to cater for the
cruising sailor.
The
LWL can be increased as long as BWL, freeboard and displacement
increase according to the following constraints;
Beam
>0.15(L x L i )
Freeboard
>0.04(L x L i )
Displacement
>V i
(L x /L i )^3
Where;
Table
value of Volume=V i
Table
value of LWL=L i
New
LWL=L x
Displacement
and Draft
The
displacement can be ascertained by weighing or calculation. It must
be stated in tonnes.
The
Seefahrtkreuzer shall be in principal measured in seawater. If
measured in fresh water, the measured waterline shall be taken as the
calculated waterline in salt water with a density of 1.0182 tonnes
per cubic meter.
Sails
a)
The rated sail area (S i )
may not be exceeded. The measured sail area is calculated by the
following;
S v =S i (1.164(0.21G/S i ))
S i =table
value SA
G=Mainsail
Area
S v =measured
sail area
b)
The measured sail area is the sum of all sails behind the mast and
0.85 of the foretriangle area.
Sails
are measured according to the international rule.
The
mainsail is the biggest of all measured sails, where the fore
triangle is measured as a sail (at 100%).
Where
you have a topsail, or a staysail under or over the mainsail, ‘G’
is the sum of those sails and the mainsail area.
c)
The rig and division of the sail area is otherwise free.
The
rig height is the vertical distance between the top of sheer and the
highest point of sail measurement.
d)
The calculation of the sail area, shall be that the areas of the
individual triangles in to which the sails are divided, are
calculated uses all three edges.
e)
The number of battens in a sail shall not be greater than;
3080sqm,
4. 100250sqm, 5.
The
length of the battens shall not exceed the following dimensions;
Highest
and lowest batten; 0.12G ½ ,
Other battens; 0.17G ½ .
Where ‘G’ is the area of the sail containing the battens.
The
battens should be equally spaced down the leech.
Masting
and Rigging.
Prebent
masts are forbidden. The shrouds on each side shall have a combined
breaking load of 150% of the displacement. The strength of the shroud
fittings shall have at least the same breaking load as the shroud
itself.
Grandfathering.
Yachts
built before 1/1/1929 and approximately comply to the rule, may be
allowed to race as members of the relevant Seefahrtkreuzer class.
(the German original then goes on with the details involved in this,
we did not yet translated it as it has little relevance to the boats
built for the rule, if anyone wants this however we will have a go at
it)
Table
of Measures for the 50sqm Seefahrtkreuzer Class. (For smaller or
bigger yachts – see German rules on website.
Item

Abbr.

Type

Measurement

I.
Main dimensions




Sail
area

S i

Maximum

50
m^2

Rig
height

H l

Maximum

13.5
m

Length
Water Line

L

Maximum

8.2
m

BOA
at .55L

B

Minimum

2.6
m

Draft
.55L

T

Maximum

1.6
m

Freeboard
.55L

F

Minimum

0.65
m

Bulwark
Height Forward of .55L


Minimum

0.08
m

Displacement

V i

Minimum

6
t

Inside
width of coachroof (at max with)

b a

Minimum

1.54
m

Inside
length of coachroof

l a

Minimum

3.1
m

Length
of cabin sole

l f

Minimum

1.85
m

Breadth
of cabin sole

b f

Minimum

0.65
m

Height
from sole to upper edge of top strake (increases if freeboard is
increased)

h 1

Minimum

1.3
m

Height
from sole to underside of coachroof over the sole area

h 2

Minimum

1.8
m

Bulkhead
Thickness (?)


Minimum

0.022
m





II
. Comfort




The
cabin must have both a forward and an aft bulkhead.


Minimum


Number
of berths (1.85x0.65(mean width))


Minimum

3

Of
which can be pipe cots.


Maximum

2

Tableware


Minimum

3

Separate
Heads


Minimum

1

Area
at sitting height in heads compartment


Minimum

0.55
m^2

Enclosed
storage space.


Minimum

0.5
m^3

Water
tankage


Minimum

60
litre





III.
Tender




Length


Minimum

n/a

Breath


Minimum

n/a

Draft
at half breath from inside of planking to gunwale


Minimum

n/a





IV.
Crew




Total


Maximum

5

Of
which paid.


Maximum

1

Translated
by
Matthew
Lingley and Jonas Felix Krüger 24/2/2008
Any
thoughts, questions or corrections please send to
matthew_lingley@hotmail.com.
updated: Aug.22.2013