JordanD
Chinese Food Enthusiast
It might be a little combination of my fatigue from studying or general slowness, but I'm having a hard time with some of the weight shift formulas in the PHAK, mainly just the one that deals with determining how much weight should be shifted to bring the CG within limits.
Aircraft total weight 7,800 lbs
CG station 81.5 in
Aft CG limit 80.5 in
Determine how much cargo must be shifted from the aft cargo compart-ment at station 150 to the forward cargo compartment at station 30 to move the CG to exactly the aft limit
Solution:
Weight to be shifted = New CG
Total Weight = Distance weight is shifted
Weight to be shifted = 1.0in
7,800 lbs = 120in
Weight to be shifted = 65 lbs
So far I get that we need to move the CG 1 inch forward to bring it within limits, and that we're moving the weight 120in from station 150 to station 130. But I'm still not quite getting how they arrived at 65 lbs. Help?
Aircraft total weight 7,800 lbs
CG station 81.5 in
Aft CG limit 80.5 in
Determine how much cargo must be shifted from the aft cargo compart-ment at station 150 to the forward cargo compartment at station 30 to move the CG to exactly the aft limit
Solution:
Weight to be shifted = New CG
Total Weight = Distance weight is shifted
Weight to be shifted = 1.0in
7,800 lbs = 120in
Weight to be shifted = 65 lbs
So far I get that we need to move the CG 1 inch forward to bring it within limits, and that we're moving the weight 120in from station 150 to station 130. But I'm still not quite getting how they arrived at 65 lbs. Help?