Design

Racing iceboat design

The following variables are only for a basic analysis.  Some areas that need more comprehensive variables are:  battens, snow cover, shell ice, hoar frost.

  • wing
    • measured
      • WingHeight (ft)  [distance perpendical to ice: boom bottom to sail head] 
      • WingArea (ft*ft)  [area: sail + boom + mast{along sail luff}]  
      • BoomElevation (ft)  [height above ice to bottom of boom]
      • SailFoot (ft)  [length of sail foot]
      • MastDepthG (ft)  [depth of mast at gooseneck]
    • estimated
      • CoefLiftMax  [coefficient of lift - maximum]
      • WingAttackAngleMax (deg)  [angle of attack at ClLiftMax]
      • LiftDragRatio  [ratio of lift to drag at 80% WingAttackAngle]
    • calculated
      • WingFoot (ft)  [SailFoot + MastDepthG]
      • AspectRatio  [WingHeight**2 / WingArea]
      • EllipticalFactor  [sqrt(WingHeight/(AspectRatio*WingFoot))]
      • InducedDragFactor  [(1./(PI * AspectRatio * EllipticalFactor)]
      • WingCenterEffort (ft) [height above boom bottom to COE]
      • LiftingArm  (ft)  [WingCenterEffort + BoomElevation] 
  • stability
    • measured
      • FuselageArm (ft) = distance from steering kingpin to plank middle
        • measurement is parallel to boat direction
      • RunnerCut (ft) = distance between rear runners in chocks
        • measurement is perpendicular to boat direction
      • Weight (lbs) = all up weight of boat and skipper
      • RunnerFaceAngle (deg)  [angle between runner faces]
    • calculated
      • RunnerArm (ft) = .5 * RunnerCut
      • RightingArm (ft) = RunnerArm * sin(arctan(FuselageArm/RunnerArm))
      • MaxLiftH (lbs)  [Weight * (RightingArm/LiftingArm)]
        • max lift before boat begins to hike
      • MaxLiftS (lbs)  [Weight * (RightingArm/LiftingArm)]
        • max lift before runners side slip out of runner groove
  • wind
  • forces
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