EveryCalc
0.6
Hood and Wheel Pitcher
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Ball Diameter +/- [in]
Ball Mass +/- [lbm]
Ball MOI RatioRatio of MOI to mass times radius squared.
2/5 for a solid sphere, 2/3 for a hollow sphere, 1/2 for a solid cylinder, 1 for a hollow cylinder.		 +/- [-]
Ball StiffnessStiffness of the ball. This should be evaluated as a shock condition and near the amount of compression in the case of nonlinear balls (which, practically any ball will be) +/- [lbf/in]
Wheel Gap +/- [in]
Bottom Wheel
Wheel Diameter +/-
Wheel MOI +/- [lbm in^2]
COF Wheel +/- [-]
Flywheel Target Velocity +/- [RPM]
Motor
# MotorsHow many motors do you have in total for this mechanism (assuming they're identical, and geared together)
EfficiencyEfficiency of the transmission [%]
Free SpeedThe maximum RPM of the motor [RPM]
Stall TorqueThe maximum torque of the motor, occurring at 0 RPM [lbf]
Free CurrentThe current drawn when the motor is unloaded [A]
Stall CurrentThe current drawn at 0 RPM / Max Torque [A]
Gear RatioThe overall gear ratio. Larger than 1 is a reduction, smaller is a RPM increase. Empty cells are assumed to be 1. You can either blank out all the cells, and plug in a number in the top right one, or build a ratio by typing in the number of teeth on each gear (or belts/sprockets) starting from the motor.
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Top Wheel
Wheel Diameter +/- [in]
Wheel MOI +/- [lbm in^2]
COF Wheel +/- [-]
Flywheel Target Velocity +/- [RPM]
MotorIf geared to bottom, a positive number indicates spin in the reverse direction (wheels both propelling) while a negative indicates spin in the reverse direction (top wheel providing excess backspin)
# MotorsHow many motors do you have in total for this mechanism (assuming they're identical, and geared together)
EfficiencyEfficiency of the transmission [%]
Free SpeedThe maximum RPM of the motor [RPM]
Stall TorqueThe maximum torque of the motor, occurring at 0 RPM [lbf]
Free CurrentThe current drawn when the motor is unloaded [A]
Stall CurrentThe current drawn at 0 RPM / Max Torque [A]
Gear RatioThe overall gear ratio. Larger than 1 is a reduction, smaller is a RPM increase. Empty cells are assumed to be 1. You can either blank out all the cells, and plug in a number in the top right one, or build a ratio by typing in the number of teeth on each gear (or belts/sprockets) starting from the motor.
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Exit Velocity +/- [ft/s]
Exit Ball RPM +/- [RPM]
Exit Wheelspeed (Top) +/- [RPM]
Exit Wheelspeed (Bottom) +/- [RPM]

The plot displays the run with the highest exit velocity, and lowest exit velocity.

Click on the plot to probe particular points for values.

Launch Simulation
Position [in] Ball Velocity [ft/s] Ball Spin [RPM] / Lower [RPM] Upper [RPM] / Flywheel Speed