The avatar for @johnwelford
johnwelford
Published
Edited
Jul 19, 2020
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angleSet = 1.5
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wheelBase = 1240 // mm
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forkLength = 581 // axle to crown length, mm
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initialHeadAngle = 64 // degrees from horizontal
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axleHeightToCrownHeight = forkLength * sin(initialHeadAngle)
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frontAxleToCrownHorizontal = Math.sqrt(forkLength*forkLength - axleHeightToCrownHeight*axleHeightToCrownHeight)
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rearAxleToCrownAngle = atan(axleHeightToCrownHeight/(wheelBase-frontAxleToCrownHorizontal))
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trianglePeakAngle = 180 - initialHeadAngle - rearAxleToCrownAngle
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rearAxleToCrownLength = axleHeightToCrownHeight / sin(rearAxleToCrownAngle)
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newPeakAngle = trianglePeakAngle + angleSet
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newWheelBase = Math.sqrt(rearAxleToCrownLength*rearAxleToCrownLength + forkLength*forkLength - (2*rearAxleToCrownLength*forkLength*cos(newPeakAngle)))
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adjustedHeadAngle = asin(rearAxleToCrownLength*sin(newPeakAngle)/newWheelBase)
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newAxleHeightToCrownHeight = forkLength * sin(adjustedHeadAngle)
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