Division 4.1

The total mass of the upper legform impactor including those propulsion and guidance components which are effectively part of the impactor during the impact shall be 9,5 kg ± 0,1 kg. The upper legform impactor mass may be adjusted from this value by up to ± 1 kg, provided the required impact velocity is also changed using the formula:

$$\mathrm{V\; =}\sqrt{\frac{\mathrm{1\; 170}}{M}}$$

where

V

impact velocity (m/s)

M

mass (kg), measured to an accuracy of better than ± 1 %