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Ultimate Sailing. Stephen Bourn. 12 July 2005. www.wingbornehydrofoil. com. Velocity triangle. Boat velocity. Apparent wind angle 30 . True course. b. g. Apparent wind. True wind. Aero force. Hydro force. e A - aero drag angle. e H - hydro drag angle. f A - aero elevation - PowerPoint PPT Presentation
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12 July 2005
Ultimate SailingUltimate SailingStephen Bourn
www.wingbornehydrofoil.com
Apparent windangle 30 True
course
True wind
Apparentwind
Boat velocityVelocity triangle
Gravity force
– apparent wind angle
H - hydro drag angle
H - hydro elevation angle
A - aero drag angle
A - aero elevationangle
Aero force
Hydro force
Air velocity
Water velocity
True wind velocity
IH – projectedhydro drag angle
IA – projectedaero drag angle
A
A
HH
H
H
A
A
cos
sinarcsin
cos
sinarcsin
– true course
H
H
A
A
cos
sinarcsin
cos
sinarcsinmin
speedmax
