$$ CPM = (2.0 \times HS + 165) + (45.0 - L) \times 7.0 + \frac{H - 170}{5} + (BL_{pts} - 2.0) $$

$$ \tau_{total} = M_{head}(L-14) + M_{shaft}(\frac{L}{2}-14) + M_{grip}(4-14) $$ $$ BL_{points} = \frac{\tau_{total} - 6052}{49.6} $$

$$ HS_{est} = HS_{base} \times (\frac{L}{45.25})^{0.45} \times (\frac{Weight_{std}}{Weight_{cur}})^{0.15} \times Pen_{BL} $$

$$ V_{ball} = HS_{est} \times \frac{1+0.83}{1 + m_{ball}/M_{head}} \times \sqrt{\cos(Loft)} $$

$$ C_d = 0.21 + 0.65 \times S^{1.1}, \quad C_l = 0.12 + 1.2 \times S $$

$$ V_{roll} = V_{land} \times \cos(\theta_{land}) \times C_{bounce} $$ $$ \mu_{eff} = \mu_{base} \times (1.0 + \max(0, \frac{25 - \theta_{land}}{10})) \quad (\text{Shallow Penality}) $$ $$ C_{eff} = C_{bounce} \times (1.0 - \max(0, \frac{\theta_{land}-40}{20})) \quad (\text{Steep Penality}) $$ $$ Run = \frac{V_{roll}^2}{2 \cdot g \cdot \mu_{eff}} $$