SCX 4wd Rollout Calculator
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SCX 4WD Car / Raid Over/Under Drive Chart
V1.0
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Pinion Front
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Enter your Pinion, Spur, and tyre dimentions into cells E11 - E14 to perform the calculations.
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Pinion Rear
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Note: This is a live spreadsheet, so if it's in use, please be patient.
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Spur Front
26Enjoy... :)
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Spur Rear
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Front Tyre Diameter
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Raid LayShaft Spur
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Rear Tyre Diameter
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Raid LayShaft Pinion
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SCX 4WD CarsSCX Raid Trucks
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Pinion FrontSpur FrontPinion RearSpur RearFront RatioRear RatioFront RolloutRear Rollout4wd Gear RatioRollout RatioFront RolloutRear RolloutFront RatioRear Ratio
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102512232.501.9226.3932.291.3040.81716.9620.763.892.98
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102612242.602.0025.3730.941.3000.82016.3119.894.043.11
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102712252.702.0824.4329.711.2960.82315.7119.104.203.24
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112511232.272.0929.0329.601.0870.98118.6619.033.543.25
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112611242.362.1827.9128.371.0830.98417.9418.243.683.39
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112711252.452.2726.8827.231.0800.98717.2817.513.823.54
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122510232.082.3031.6726.910.9061.17720.3617.303.243.58
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122610242.172.4030.4525.790.9031.18119.5716.583.373.73
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122710252.252.5029.3224.760.9001.18418.8515.913.503.89
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Notes:
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Rollout ratio = Axle RPM : Front Wheel RPM
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Rollout ratio with one-way hubs should always underdrive the fronts, and be less than 1, otherwise the hubs don't work.
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Rollout ratio with fixed hubs should slightly overdrive the front.
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Overdriving the front will also cause the front tyres to wear much faster.
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Rollout is how far the car will travel for 1 rotation of the motor.
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Higher torque motors generally prefer a larger rollout.
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Higher RPM motors usually prefer a smaller rollout.
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Larger tracks in most cases prefer a larger rollout.
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Higher Voltage probably requires a lower rollout.
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:)
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