Notes for Webb and Will

• We need accurate wind measurements in order to optimize the sail control
• Right now we are using a very rudimentary wind vane, but it is not the most responsive and doesn’t measure wind speed
• Ultrasonic anemometers can determine direction and speed with no moving parts
• Commercial versions of manual wind vanes/anemometers exist but are bulky and expensive
• Someone had started on this project long before I was here and has a box of parts that might be useful, at least the transducers

References

• Very basic ultrasonic anemometer: https://www.instructables.com/Sonic-Anemometer/

Design Requirements

• Wind angle measurement precision of +-15 degrees
• Wind speed measurement precision: <10m/s, ±1m/s; ≥10m/s, ±10%
• Responds quickly to changes in wind direction
• Versatile bolt pattern for mounting to wingsail counterbalance

Constraints

• As lightweight as possible
• Doesn’t obstruct airflow over wingsail