Owner`s manual

MAST COMPRESSION
= HEELING MOMENT / HEELING ARM
=204,000ft.lb. / 10.5ft.
=19,428 lb.
TIMES SAFETY FACTOR OF 3,
USE 60,000 lb. FOR MAST AND BULKHEAD DESIGN
DESIGN MAXIMUM
HEELING MOMENT
EQUALS RESTORING
MOMENT
RESTORING MOMENT
= VESSEL WEIGHT X RIGHTING ARM
=24,000 lb. X 8.5ft.
=204,000 ft.lb.
MAST BULKHEAD RESISTS BENDING
ACROSS ITS WIDTH
FORE / AFT BULKHEAD RESISTS
LOCALISED BUCKLING OF
MAST BULKHEAD
SHROUDS
PULL UP
SAFETY FACTOR ACCOUNTS FOR:
INERTIAL LOADS,
EXTREME CONDITIONS
VARIATIONS IN VESSEL WEIGHT,
MATERIAL PROPERTY VARIATIONS
MAST DESIGN CONSIDERS:
COMPRESSION LOADS,
BENDING LOADS DUE TO SAILS,
INERTIAL LOADS DUE TO MOTION
SHROUDS
PULL UP
THIS DIAGRAM REFLECTS THE CONDITIONS
APPLICABLE TO CATAMARANS AND IS NOT APPROPRIATE
FOR CONSIDERATION OF BALLASTED MONOHULL VESSELS.
TYPICALLY THE SPAR AND RIGGING LOADS FOR CATAMARANS
ARE 1.5 TIMES HIGHER THAN FOR MONOHULLS OF SIMILAR SAIL
AREA DUE TO THEIR HIGH RESISTANCE TO HEELING
MAST PUSHES
DOWN
S
H
R
O
U
D
T
E
N
S
I
O
N
F
O
R
C
E
T.C.
MAST COMPRESSION FORCE
10'-6"
8'-6"
GRAVITY FORCE
(WEIGHT OF VESSEL)
HEELING FORCES
HEELING PIVOT IS CENTRE OF BUOYANCY,
OUTBOARD OF HULL CENTRE TO REFLECT
HEELED CONDITION AT 15°+/-
ISSUED JUNE 10, 2008
ANTARES 44 CALCULATIONS
MAST LOAD DIAGRAM
CA-04-04
SHROUD TENSION IS
APPROXIMATELY
20,250 LB. DUE TO
CHAINPLATE POSITION
GEOMETRY