1. Introduction
Launching a boat to sea from open shore requires exit through the surf zone. Most
crafts are not capable of crossing the surf zone and are embarked from a port, the
opening of which is out of the surf zone. Surfers manage to cross high breaking
waves applying minor thrust, rowing with their bare hands. The technique they use
is called Duck-Dive. Immersing, at the right place and time, enables the surfer to
pass beneath the breaking of the wave. The aim of this project is to design and
demonstrate a boat that crosses breakers by performing a duck-dive.
Team: Roi Steinmetz, Zvika Brasz
Customer requirement & Project targets
• Handling of a remote controlled boat
• 3D Scanning of the boat to a CAD model.
• Extracting Body-Plan and Setting up Hydrostatic Model
• Assessment of thrust and power and compare to the measured performances
• Assessment of the effect of a trim-flap.
• Design and production of a trim flap-that can perform duck-dive
• Design and production of a remote-control of the trim-flap
• Trials of duck-dive in a flume and of crossing breaking waves at sea.
Duck Dive Boat
Experiments
We used NACA 01016 wing profile which is nearly symmetrical.
According to the initial hydrostatic moment to change trim,
obtained from the hydrostatic model, we can achieve an initial
trim of 10mm. When the bow submerges the moment to
Change trim dramatically decreases and the boat develops
A steep trim unless the angle of attack is decreased.
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Technical Challenges
• Design and install trim-flaps and control system.
• Making the boat watertight using Cell foam and high vacuum silicon.
attaching plexiglass to strengthen the rim. original hatch and self-made hatch.
Indoor experiment at the CAMERI test channel- Footage through underwater line glass with no waves
First Trail
Excessive flap maneuver caused the boat to dive too deep’ to hit the bottom of the channel
Flaps lowered to start duck diveBoat dives
Flaps Lifted to start exiting the water
Boat out of the water
Second Trail
Successful duck dive in calm water
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Outdoor experiment at open sea- Wave height approx. 20cm.
Thanks
Technion Autonomous Systems Program
Coastal and Marine Engineering Research Institute
Engineer Amitai Peleg
Zvi Shachar
Professor Nitai Drimer
Advisors: Engineer Amitai Peleg, Professor Nitai Drimer
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