BECKER DAGGERBOARD THE MISSING LINK BETWEEN WIND PROPULSION AND HYDRODYNAMIC CONTROL
The Becker Daggerboard solves this challenge by minimising drift and drag, thus ensuring vessels capture the full return on investment from WAPS while lowering power costs and emissions.
Wind-Assisted Propulsion Systems (WAPS) unlock significant power savings, but their side forces create leeway that reduces efficiency.
PRECISION UNDER SAILS
How the Daggerboard improves the efficiency of WAPS:
First installations demonstrate how the Becker Daggerboard stabilises course and reduces drift in wind-assisted vessels.
A LOW COMPENSATION: Minimal underwater lift results in significant leeway; the ship drifts noticeably sideways. B MODERATE COMPENSATION:
RORO VESSEL FOR LOUIS DREYFUS ARMATEURS (LDA) Installation of two foldable Daggerboards per vessel Fin area: 8.8 m² | Lift force: 300 kN at 8° and 14 knots
The underwater body provides some counterforce; the ship maintains a forward course but with visible drift.
C HIGH COMPENSATION:
An optimised underwater profile – such as with a daggerboard – aligns heading and course over ground. Lateral drift is minimised, improving navigational efficiency.
Two tailor-made solutions for efficient drift reduction
With PLC-controlled hydraulics and an optimised profile, they deliver high lift and low drag for efficient leeway compensation.
Becker offers two daggerboard models – liftable and foldable – tailored to different vessel types and operational needs. Both retract fully into the hull for safe navigation in port, shallow waters, or in times the WAPS is not in active use.
FEATURE
LIFTABLE DAGGERBOARD Symmetrical (NACA)
FOLDABLE DAGGERBOARD Symmetrical (NACA)
Profile
Rotatability
Rotatable
Fixed (non-rotatable)
Aspect Ratio
Approx. 1.5
High (> 5)
SAILING CARGO VESSEL FOR TRANSOCEANIC WIND TRANSPORT (TOWT) Installation of two liftable Daggerboards Fin area: 7.68 m² | Blade force: 7 knots (with 0° heeling) 50 kN
Lift/Drag Ratio
> 4
> 20
Leeway Reduction
Active and highly efficient
Passive, through high aspect ratio
Retraction Function
Fully retractable into the hull
Fully retractable into the hull
Crash Protection
Predetermined breaking point at shaft coupling Emergency fold function
MANOEUVRING SYSTEMS BECKER DAGGERBOARD
Drive System
Hydraulic
Hydraulic
SHOW PRODUCT
Control System
PLC-controlled
PLC-controlled
Installation Requirements
Vertical construction through several decks
Compact horizontal folding mechanism
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