Ocean Skills Science

Overview

In this lesson (Lesson 13 of 18), students explore how sail shape and rigging affect speed and turning, then practise traditional Polynesian lashing techniques through short, guided stations.

Learning intentions

• WALT: Understand key ideas of sail aerodynamics and how rigging choices change how a sail works in wind.
• WALT: Demonstrate three traditional lashing techniques safely and accurately.
• WALT: Explain how sail design and lashing relate to movement and maneuverability in ocean conditions.

Success criteria

• I can explain how sail shape influences lift/drive and affects speed.
• I can describe how rigging and tension affect control and turning.
• I can correctly demonstrate three lashing techniques (with safe hand positions and consistent knots).
• I can use evidence from wind demos to support my explanation in my own words.

Curriculum links

• NZC Refresh: Science (explaining how forces and motion are affected by the properties and design of objects).
• NZC Refresh: Technology (working with materials/structures to meet a purpose; testing and improving).
• NZC Refresh: Social sciences (connections to knowledge and practices of Polynesian voyaging cultures).
• Key competencies: managing self, relating to others, using language/symbols/texts, and participating and contributing.

Lesson structure (70 minutes)

1. 5 min – Welcome & unit link Students recap the previous lesson: how vessels navigate ocean conditions. Share WALT and success criteria, and set expectations for safe station work and respectful handling of craft materials.

2. 10 min – Sail aerodynamics mini-lesson (teacher-led) Use a simple “two paths” explanation: air moving faster over one side of a sail creates a pressure difference that helps the sail pull the vessel forward. Emphasise sail shape (curve, angle, draft) and how changing the angle to the wind changes performance and control.

3. 10 min – Wind demonstration (whole class) In small groups, students watch fans blowing across mini-sail models or paper sails. They record observations on a template: “What changed? What happened to movement?” Use guided prompts such as: “When the sail is angled more/less, what do you notice?”

4. 10 min – Lashing theory modelling Teacher models three lashing techniques step-by-step with a visual poster and a short spoken rationale: why lashings hold parts together under load, and why consistent wraps/tension matter. Quick safety reminders: fingers clear, tidy workspace, slow and deliberate movements.

5. 15 min – Practice station rotations (hands-on) Set up three stations (10 minutes + 5 minutes transition total spread across the lesson). Students rotate through:

• Station A: Lashing Technique 1 practice on a frame.
• Station B: Lashing Technique 2 practice using pre-marked points.
• Station C: Lashing Technique 3 practice plus a “tension check” activity. At each station, students compare their lashing to a labelled example and note one improvement.

6. 15 min – Apply to an explanation (guided write/draw) Students complete an “Explain & evidence” task in notebooks or Google Classroom:

• 1 short paragraph or labelled diagram: “How sail shape affects movement”
• 2 bullet points: “How lashing/rigging affects control” They must include at least one observation from the fan demo.

7. 5 min – Share-out & exit ticket Students share one key idea with a partner, then complete an exit ticket: “One thing I learned about sail aerodynamics” and “One lashing technique I can demonstrate.” Teacher checks for misunderstandings.

Resources

• Fan(s) and small sail models (paper, cardboard, or fabric) with adjustable sail angle
• Classroom lashing materials (natural fibre or rope strips) and simple frames
• Visual lashings guide with QR codes linking to teacher-created videos (no browsing needed)
• Station record sheets (Observation + Improvement)
• Student templates for explanation (sentence starters and diagram frames)
• Safety mats or defined work zones
• Google Classroom: posting of today’s task and success criteria
• Coloured markers for dyslexia-friendly highlighting of key steps

Assessment

• Formative: teacher observes each station for correct wrapping pattern, tension control, and safe technique.
• Formative: explanation task shows whether students connect sail aerodynamics to movement and link lashings/rigging to control.
• Exit ticket checks key understanding and readiness for the next lesson.

Differentiation

• Wind demonstrations: provide “predict–watch–record” cards so low confidence students can contribute without needing long verbal explanations.
• Dyslexia-friendly options: allow audio recording of the explanation, use sentence starters, and provide diagrams with labels instead of long writing.
• Illustrated lashing guides: QR videos plus colour-coded step cards to support readers with ELL and reading difficulties.
• Support for low learners: reduce to one paragraph with two prompts; provide a checklist for the three lashings and a model to copy.
• Extension for exceeding students: challenge them to add a “cause–effect” statement such as: “If the sail angle changes, then the pressure difference changes, which affects speed/turning,” and include one rigging improvement idea for stability under wind gusts.
• ELL support: allow bilingual key words on cards (e.g., sail, wind, angle, control) and sentence frames (“I noticed…”, “This means…”).
• SEN supports: provide pre-cut rope/fibre, simplified frame markings, and a partner coach role during stations (one student reads steps; one practises).

Extension (optional)

• Advanced sailing physics challenge: Students use a “variables” thinking sheet to explain how changing sail draft or angle to wind would affect lift/drive and turning, using one additional fan test they design (with teacher approval).