It's a little early to be testing my brain, but here goes:
Convert Mac % to stations:
10% MAC = (1000 - 800) * 10 % + 800 = 820 This is the CofG at the start.
25% MAC = (1000-800) * 25% + 800 = 850 This is the CofG that you want.
NB. TOM doesn't change and the weight must be moved from 400 to 1200 i.e. 800
Remember that:
New Overall Moment = Old Overall Moment + Change of Moment.
70 tons x 850 = 70 tons x 820 + (Mass to Move x 800)
This gives
59500 = 57400 + (800 x Mass to Move)
Mass To Move = (59500 - 57400) / 800 = 2.625 tons.
Hope that helps/is correct
FIS.
Edited to say:Sending PPrune messages are like RT transmissions, wait for a minute to see if anyone is responding and then as soon as you do, you get stepped on:
