In this question we want to add mass at an aft location (station 130) without taking the CG out of limits. The CG is currently at station 115 and the limit is station 116.

Use the formula:

Added mass / Total mass = CG movement distance/ Relevant distance

• Added Mass: ?
• Total Mass: 2900 kg
• CG movement distance: from 115 location station to aft limit 116 = 1
• Relevant distance: Mass being added at station 130 to aft limit 116 = 14

Added mass / 2900 = 1 / 14

Added mass = (2900 x 1) / 14 = 207 kg

By adding 207 kg at station 130, the CG will move from station 115 to 116 but will still be in limits.

Note: The distances do not need units.