Masthead29_Mar2014 G.pub - page 5

TheMasthead
March 2014 Page5
NewPrinciplesof ResistanceTextbook
continued
RoughnessCorrection
EstimatingPower Requirements
for Displacement Boats
Resistance (Approximate) per Ton
for Displacement Boats
ApproximateEfficiency Factors
(PropulsionCoefficient)
Towing-Tank Tests for Speed-and-
PoweringCalculations for Boats
TheReynoldsNumber and Laminar
FlowonModels
Compensating for theDisparity in
Similitude forModels
Chapter 3 - Practical SpeedandPower-
ingCalculations, Steps toEstimate
Speed, SpeedRegimes, Displacement
Speed, Semi-PlaningSpeed, Planing
Speed,Multihull SpeedCalculations
EstimatingSpeed
Steps toEstimateSpeed
Displacement/LengthRatio (DL
Ratio)
Speed-LengthRatio (SLRatio)
FroudeNumber Linear (Fnl)
VolumeFroudeNumber (Fnv)
SpeedRegimes orModes
DisplacementMode
MaximumSLRatio vs. DLRatio–Displacement Hulls
PlaningMode
Semi-Displacement or Semi-PlaningMode
SpeedFormulas for EachModeof Operation
Displacement-SpeedCalculations
Gerr’sDisplacement-SpeedFormula
Semi-Displacement/Semi-PlaningSpeedCalculations
Wyman’sSpeedFormula
Power-to-Weight Ratio
Planing-SpeedCalculations
Crouch’sPlaning-SpeedFormula
CrouchConstants
Determining theSpeedPotential of aHull
StandardPlaningAngle
Optimal ButtockAngles
ButtockAngle vs. Speed Table
PlaningHullsWithHighButtockAngles
Deadrise, DLRatioand the Inceptionof PlaningSpeed
Longitudinal Center of Gravity (LCG) andBoat Speed
Performanceof PlaningHulls at LowSpeed
RunningGear andBoat Speed
Round-BilgeBoats at Higher Speeds andSailboats
ComparingSpeedFormulas– TransitionSpeedsBe-
tweenFormulas
Multihull SpeedFormulas
EffectiveDLRatioMultiplier Basedon L/BRatio–Multi-
hulls
Kelsall’sSlenderMultihull SpeedFormula
Westlawndirector DaveGerr said, “This is yet another in
Westlawn’s continuingprocess of updates to the curriculum.
The review, reworkandamplificationofmaterial is ongoing
andnever stops, and is oneof the reasons our alumni our so
successful. Other updates in theworks includenew texts on
aluminumhull structures,mechanical systems and sailboat
design. Stay tuned for future releases.”
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