1.) YACHT prerequisites
a.) Length : width ratio
Modern yachts usually have a length : width ratio < 4:1. That's the ideal ratio for the DualDocker
E.g.: yacht length 12 m; distance stern cleats 3 m; results in length:width ratio = 4 :1
Attention: Max. length : width ratio 5:1
E.g.: yacht distance 12m; distance stern cleats 2m; results in length:width ratio = 6:1; due to the lever effect forces on the cleats could be too high
b.)Stable exterior stern cleats
A prerequisite for using the DualDocker are stable exterior stern cleats.
Forces on the cleats:
The cleats are often the weakest link during a storm. The stability of the cleats is therefore essential for securing the yacht - that goes for conventional docking systems as well as for the DualDocker.
With 'DualDocker & securing lines' the cleats are less stressed than with conventional docking systems due to the fact that the DualDocker minimises kinetic energy from the start.
c.) Yacht size:
The DualDoker is suitable for yachts up to approx. 50' and a maximum surface area exposed to the wind of 30 m²
The length:width ratio, the area exposed to the wind and the air resistance (Cw) determine the forces on the cleats.
d.) Weight:
The DualDocker is suitable for yachts of max. 15 tons gross weight.
2.) MARINA prerequisites
Pier & floating dock:
The DualDocker can be mounted on a concrete pier as well as on a floating dock.
Surface:
The ideal surface is concrete (>B250), steel or stainless steel. Aluminium or wood are principally possible, provided they are solid enough.
Anchor bolts:
The harbour adapter is solidly mounted with four V4A anchor bolts (M16x165). Alternatively there are angle adapters for installation on the vertical side of the pier.
For new marina installations the harbour adapter can be moulded in the concrete. Maximum stability, perfect design solution!
Stability without play:
The harbour adapter and the arms are solidly installed without play due to 'conical technology'
Flow speed and waves:
The DualDocker system can only be used in marinas with an adequate breakwater.
Max. wave height: 0,5 m.
Max. flow speed: 3,6 metres per second (10 Km/h).
Changing water levels:
Max. 2 m difference in water level, depending on DualDocker length.
