VPP iteration notes
Laser VPP briefly outlines the cycle of calculations from an initial guess of Boatspeed. Here are the numbers for the first cycle of calculations TWA = 45° and TWS =8kn BS =5kn for the starting value, which triggers calculations for AWA = 28.1° and AWS = 12.0kn Individual drags are calculated: Hull Friction = 3.2kg Hull Wave = 3.4 Board Friction = 0.8 Sail Induced = 2.1 Windage = 0.9 Sum of Drag = 8.3 Thrust =5.6 The net force on the boat is Force = Thrust - Drag = 2.7kg Acceleration = Force/Mass - Newton's 2nd law New BS = Old BS + Acceleration x timestep = 4.97 RM = 72kgm and HM = 49kgm are compared, the crew is moved inboard -0.15m to reduce RM 2nd cycle AWA = 28.2° and AWS = 11.9kn Individual drags are calculated: Hull Friction = 3.2kg Hull Wave = 3.3 Board Friction = 0.8 Sail Induced = 2.1 Windage = 0.9 Sum of Drag = 8.1 Thrust =6.1 Net force = 2kg New BS = 4.95 RM = 57kgm and HM = 54kgm are compared, the crew is moved inboard ano